Papers by Indrani Bhattacharya
Springer Proceedings in Physics, 2015
Proc. SPIE 12214, Light in Nature IX, 1221406, 2022
In the presence of astigmatism, the three-dimensional distribution of rays in the image region pa... more In the presence of astigmatism, the three-dimensional distribution of rays in the image region passes through two orthogonal lines, the vertical sagittal foci and the horizontal tangential foci. With increasing astigmatic behaviour of the imaging system, the sagittal and tangential foci will be farther removed from each other and the separation between these two planes serves as the measure of astigmatism. Midway between these planes, i.e., corresponding to the defocus term, 𝑊20 = −𝑊22⁄2 , where 𝑊22 is the co-efficient of astigmatism, the intensity spread is found to be minimum and the transverse plane passing through this point is referred to as the plane of minimum aberration variance. For a diffraction limited
imaging system, the IPSF on this plane is the Airy pattern. In our study, each sector of the azimuthal Walsh aperture is masked by suitably oriented linear polarizers. The polarization phase introduced is a function of the state of polarization (SOP) of the input beam, the transmission axis of orientation of the masking polarizer and the orientation of the analyzer.
A feasible method to assess the degree of astigmatic compensation is to compute the IPSF at the plane of minimum astigmatic variance and compare the intensity distribution with that of airy pattern. IPSFs for different values of 𝑊22 are computed with the presence of compensating polarization masked azimuthal Walsh filters at 0° and 90° with input beam
parameters a=b=1 , 𝛿 = 90° and analyser kept at a particular angle. The results are compared with IPSFs computed for an unmasked lens and airy pattern.
Keynote Addresses: Enhancing Light-matter Interactions using Micro-structured Glass Fibres.- Sili... more Keynote Addresses: Enhancing Light-matter Interactions using Micro-structured Glass Fibres.- Silicon Photonics.- Plenary Talks: Specialty Optical Fibers for Mid-IR Photonics.- Einstein's Photoemission, Magnetic Quantization and Heavily Doped III-V Quantum Well Superlattices with Graded Interfaces.- Optical Cryptography and Watermarking using some Fractional Canonical Transforms, and Structured Masks.- Nonlinear Fibre Optics: Application to Supercontinuum Generation.- Light Propagation in micro-structured Optical Fibers and Designing High Gain Fiber Amplifier.- Design and Development of Plasmonic Hollow Core Photonic Crystal Fiber for Sensing Applications.- Determination of Refractive Index in-homogeneity of Transparent, Isotropic Optical Materials.- Real Time Amplification of Moving Light Signals by Photorefractive Ferroelectric Liquid Crystal Mixtures.- Is Higher Order Aberration Associated with reduced Visual Acuity in Children?.- Design and Optimization of Silicon Photonic De...
Plasmonics in Biology and Medicine XVII, Feb 21, 2020
Artikkelit Luonnontieteiden ja metsätieteiden tiedekunta 2020 Self-similarity in azimuthal Walsh ... more Artikkelit Luonnontieteiden ja metsätieteiden tiedekunta 2020 Self-similarity in azimuthal Walsh filters and corresponding far-field diffraction characteristics : a unique study to control tightly focused fields and coupling of light into metamaterials, plasmonic structure and waveguides Bhattacharya, Indrani SPIE Artikkelit ja abstraktit tieteellisissä konferenssijulkaisuissa © Society of Photo-Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited.
Proceedings of SPIE PW 2020, 11257, Plasmonics in Biology and Medicine XVII, 1125717, 2020
In this paper, we propose illumination beam shaping using azimuthal Walsh filters derived from az... more In this paper, we propose illumination beam shaping using azimuthal Walsh filters derived from azimuthal Walsh functions, in and around the focal plane of a rotationally symmetric imaging system and studied for finding out self-similar groups and sub-groups for different orders to examine self-similarity existing between them and their corresponding transverse intensity distributions at the far-field plane. The unique rotational self-similarities observed in 2D intensity distributions at the transverse far-field plane for adjacent orders of azimuthal Walsh filters are also presented. Practical implementations of these filters are achievable by the availability of high speed spatial light modulators (SLMs) which can be successfully used to code and control illumination in and around the tightly focused field and coupling of light into metamaterials, plasmonic structures and waveguides. Further scope of research is intended to develop a new photonics platform based on dielectric surface wave harvesting model controlled by the dynamically variable illumination using azimuthal Walsh filters. Surface waves such as Bloch Surface Waves (BSW) and Surface Plasmons (SP) can be considered as the future enabling tools using this concept for probable applications in Photonics Research as well as in Industrial sectors, namely, quantum optics, telecom, sensing, computing, security, imaging and medical applications.
Azimuthal Walsh Functions can be utilized to obtain an orthogonal set of Azimuthal Walsh Filters ... more Azimuthal Walsh Functions can be utilized to obtain an orthogonal set of Azimuthal Walsh Filters where the transmission values of +1 and-1 are achieved by using 0 and pi phase respectively. The inherent asymmetry in the azimuthal Walsh filters leads to asymmetrical Point Spread Function (PSF) in the far field diffraction pattern. This report presents results of our preliminary investigation on the effects of phase asymmetry in the filters on the PSF in the Far-field patterns.
Azimuthal Walsh filters derived from azimuthal Walsh
functions can provide a viable and interesti... more Azimuthal Walsh filters derived from azimuthal Walsh
functions can provide a viable and interesting tool for the
analysis and synthesis of microwave antenna and optical imaging systems. They can provide a convenient energy-efficient technique for tailoring of three dimensional point spread function near the focal plane of a rotationally symmetric imaging system. Starting with a brief description of the basic properties of azimuthal Walsh functions, this paper reports the generation of azimuthal Walsh filters along with their far-field diffraction characteristics for tailoring three dimensional point spread function near the focal plane of a rotationally symmetric imaging system.
Point spread function (PSF) Engineering using Pupil plane phase filters is currently an active ar... more Point spread function (PSF) Engineering using Pupil plane phase filters is currently an active area of research and provides a convenient energy-efficient technique for tailoring of three dimensional point spread function near the focal plane of a rotationally symmetric imaging system. Azimuthal Walsh filters, derived from Azimuthal Walsh functions, which can take the values either +1 or -1 over a specified phase domain, form a set of orthogonal binary phase filters which can be reliably realized in practice, and used for the purpose. This paper reports our recent exploration on the far-field diffraction characteristics of Azimuthal Walsh filters, and the corresponding axial as well as off-axial intensity distributions.
Pupil plane phase filtering provides a convenient energy-efficient technique for tailoring of thr... more Pupil plane phase filtering provides a convenient energy-efficient technique for tailoring of three dimensional point spread function in imaging systems. Walsh filters, derived from orthogonal Walsh functions which can take the values either +1 or -1 over a specified domain, are a set of binary phase filters which can be reliably realized in practice, and used for the purpose. This paper reports our recent exploration on self-similarity in the set of polar Walsh filters in two dimensions, and the self-similarity in three dimensional point spread function obtained by use of corresponding polar Walsh filters.
Based upon the prophylactic strategy for optical design developed in Department of Applied Optics... more Based upon the prophylactic strategy for optical design developed in Department of Applied Optics & Photonics, University of Calcutta, this paper reports an overview of the design of multi-component zoom lens. This strategy includes the effective use of the thin lens aberration theory and paraxial ray optics in reducing a formidable design problem with large degrees of freedom into a set of sub-problems with considerably lower degrees of freedom. Some of the design steps involve global or quasiglobal optimization of design variables, and others are facilitated by computer implementation of analytical methods. The total primary aberrations of the whole system in selected zoom positions are kept within a given targeted value. Illustrative numerical results of the design procedure are presented.
Ph.D. Thesis by Indrani Bhattacharya
The possibility of using azimuthal Walsh filters, derived from the orthogonal set of azimuthal Wa... more The possibility of using azimuthal Walsh filters, derived from the orthogonal set of azimuthal Walsh functions, as base functions have been proposed, to manipulate the far-field diffraction pattern at and along the region of the transverse far-field plane, of a rotationally symmetric imaging system has been proposed in this investigation. The existence of self-similarity observed in the 2D intensity distributions exhibited by members of self-similar Groups and Sub-Groups of azimuthal Walsh filters has also been reported. The rotational self-similarity portrayed in the 2D intensity distributions by corresponding adjacent as well as distant orders of self-similar azimuthal Walsh filters rotated by specific angles has been demonstrated and this provides a unique property exhibited by azimuthal Walsh filters compared to radial and annular categories. We have used MATLAB 2017a platform for the advance level computation and generate high quality graphics for the study of the far-field diffraction pattern for different orders of azimuthal Walsh filters.
Practical implementation of these filters can be achievable by the availability of high-speed Spatial Light modulators where the in-situ generation of different orders of azimuthal Walsh filters are possible and combinations of lower orders filters to achieve higher orders may be explored. The lossless azimuthal Walsh filters are energy efficient and can be used to solve the problem of direct implementation of a finite number of constant as well as varying phase levels.
Further scope of research includes the use of azimuthal Walsh filters as phase-shifted zone plates to generate complex 3D beam structures like petal shaped and optical ring lattice beams. Azimuthal Walsh filters can be used very efficiently near the focus of an imaging system to cater the needs of 3D imaging, lithography, optical superresolution, optical tomography and so on. Optical micro- and macro-manipulations using azimuthal variant Walsh filters or combinations with radial variety can be used to form gradient force trap for optical tweezers for manipulating objects of size comparable to a single atom to 100µm without mechanical contact.
The two unique characteristics, namely, the orthogonality of azimuthal and radial Walsh filters and the self-similarity in different orders may be used to facilitate tackling of the inverse problem where a phase filter needs to be synthesized in accordance with pre-specified diffraction characteristics which may provide as an energy efficient solution to circumvent different problems related to Biology, Physics and Environmental issues.
Books by Indrani Bhattacharya
Bhattacharya, Azimuthal Walsh Filters: Upcoming Manuscript (89034739), 2020
This book explores the possibility of using azimuthal Walsh filters derived from azimuthal Walsh ... more This book explores the possibility of using azimuthal Walsh filters derived from azimuthal Walsh functions as an effective tool for generation of 2D and 3D light structures by manipulating far-field diffraction characteristics near the focal plane of a rotationally symmetric imaging system when used as pupil filters. Starting with the definition of Walsh functions, this book reports the generation and synthesis of azimuthal Walsh filters. The inherent self-similarity present in the various orders of the azimuthal Walsh filters have been explored and the filters are classified into self-similar groups and sub-groups. Azimuthal Walsh filters are observed to possess a unique rotational self-similarity exhibited among adjacent orders is also presented in this book.
Springer Nature : Springer Proceedings in Physics, 2019
This volume contains a series of technical papers presented at 19th International
Symposium on Op... more This volume contains a series of technical papers presented at 19th International
Symposium on Optomechatronic Technology (ISOT 2018) organized by the
International Society for Optomechatronics (ISOM) and Centro de Investigaciones
en Óptica (CIO) and held in Cancún, Quintana Roo, México, during November
5–8, 2018.
Symposium had topics relating to optical metrology, optical imaging/interferometry,
optical fiber sensors, polarization sensing and imaging, laser-based sensors, optical
sensors on robotics autonomous vehicles and other applications, optofluidics,
optomechatronics for sensing and imaging, micro-optoelectro-mechanical systems,
optical inspection for industry, adaptive optics, visual motion tracking and control,
biomedical applications, vision-based monitoring and control, optical manipulation and tweezers and their applications, material laser processing, actuators based on optics and optomechatronics, 3D processing, 3D fabrication and 3D printer, thin film technology, solar cell and two special sessions of polarization technology and sensors based on the use of lasers and fiber optics.
This collection of twenty-two chapters presents experimental and computational
investigations on important areas of optomechatronics. Symposium was intended to
be interdisciplinary forums for engineers, technicians, researchers and managers
involved in all fields of optics, optomechatronics, mechanics and mechanical
engineering.
The Proceedings of First International Conference on Opto-Electronics and Applied Optics 2014, IE... more The Proceedings of First International Conference on Opto-Electronics and Applied Optics 2014, IEM OPTRONIX 2014 presents the research contributions presented in the conference by researchers from both India and abroad. Contributions from established scientists as well as
students are included. The book is organized to enable easy access to various topics of interest. The first part includes the Keynote addresses by Phillip Russell, Max Planck Institute of the Light Sciences, Erlangen, Germany and Lorenzo Pavesi, University of Trento, Italy. The second part focuses on the Plenary Talks given by eminent scientists, namely, Azizur Rahman, City University London, London; Bishnu Pal, President, The Optical Society of India; Kamakhya Ghatak, National Institute of Technology, Agartala; Kehar Singh, Former Professor, Indian Institute of Technology Delhi; Mourad Zghal, SUPCOM, University of Carthage, Tunisia; Partha Roy Chaudhuri, IIT Kharagpur; S K. Bhadra, CSIR-Central Glass and Ceramic Research Institute, Kolkata; Sanjib Chatterjee, Raja Ramanna Centre for Advanced Technology, Indore; Takeo Sasaki, Tokyo University, Japan; Lakshminarayan Hazra, Emeritus Professor, University of Calcutta, Kolkata; Shyam Akashe, ITM University, Gwalior and Vasudevan Lakshminarayanan, University of Waterloo, Canada. The subsequent parts focus on topic-wise contributory papers in Application of Solar Energy; Diffraction Tomography; E.M. Radiation Theory and Antenna; Fibre Optics and Devices; Photonics for Space Applications; Micro-Electronics and VLSI; Nano-Photonics, Bio-Photonics and Bio-Medical Optics; Non-linear Phenomena and Chaos; Optical and Digital Data and Image Processing; Optical Communications and Networks; Optical Design; Opto-Electronic Devices; Opto-Electronic Materials and Quantum Optics and Information Processing.
OPTRONIX 2016 is an effort to promote and present the research works by scientists and researcher... more OPTRONIX 2016 is an effort to promote and present the research works by scientists and researchers including students in India and abroad in the area of Green Photonics and other related areas as well as to raise awareness about the recent trends of research and development in the area of the related fields. The book has been organized in such a way that it will be easier for the readers to go through and find out the topic of their interests. The first € price and the £ and $ price are net prices, subject to local VAT. Prices indicated with [1] include VAT for books; the €(D) includes 7% for Germany, the €(A) includes 10% for Austria. Prices indicated with [2] include VAT for electronic products; 19% for Germany, 20% for Austria. All prices exclusive of carriage charges. Prices and other details are subject to change without notice. All errors and omissions excepted. [3] No discount for MyCopy.
The Proceedings of 2nd International Conference on Opto-Electronics and Applied Optics 2015, IEM ... more The Proceedings of 2nd International Conference on Opto-Electronics and Applied Optics 2015, IEM OPTRONIX 2015 in technical collaboration with IEEE Photonics Society supported by IEEE Vancouver Section is an effort to present the research contributions presented in the conference by the researchers from India and abroad. The book has been organized to enable easy access on various topics. The first part includes the Keynote addresses by Brian Culshaw, University of Strathclyde, UK, followed by Graham Reed, University of Southampton, Guildford, UK and Jϋrgen Jahns of Fern Universität, Hagen, Germany. The second part focuses on the Plenary Talks given by eminent scientists of International repute namely, Azizur Rahman, City University, London, Bahram Jalali, University of California, Los Angeles, USA, James B Cole, University of Tsukuba, Japan, Raman Kashyap, Polytechnique Montreal, Canada,
Tigran Galstian, University of Laval, Canada, Motoharu Fujigaki, University of Fukui, Japan, Navin Kumar Nishchal, Indian Institute of Technology, Patna, India, Takeo Sasaki, Tokyo University of Science, Japan. The subsequent parts focuses on contributory papers sub-divided into four different tracks namely :
Track 1 : Silicon Photonics, Image Processing, Bio-Medical Optics
Track 2 : Fibre Optics, Photonics, Interferometry, Nano-Photonics
Track 3 : Holography, Solar Cells, Opto-electronic Materials
Track 4 : Optical Communications, Photonic Crystal Fibers
Book Chapters by Indrani Bhattacharya
Progress in Optomechatronic Technologies, 2019
Azimuthal Walsh filters derived from radially invariant azimuthal Walsh functions can be used as ... more Azimuthal Walsh filters derived from radially invariant azimuthal Walsh functions can be used as an effective tool for producing 2D and 3D light structures near the focal plane of a rotationally symmetric imaging system by manipulating the far-field diffraction characteristics when used as pupil filters. Starting with the definition of azimuthal Walsh functions and using the scalar diffrac-tion theory, this research work reports the possibility of modifying the beam structure around the far-field plane by diffraction characteristics of azimuthal Walsh filters placed on the exit pupil plane when computed analytically. The asymmetrical beam produced due to the inherent phase asymmetries introduced by azimuthal Walsh filters may find many important applications in micro-and nano-photonics.
Advances in Optical Science and Engineering, Springer Proceedings in Physics, 2015
Binary polar Walsh filters derived from two dimensional polar Walsh functions provides an effecti... more Binary polar Walsh filters derived from two dimensional polar Walsh functions provides an effective tool for tailoring the three dimensional intensity distributions of a point spread function (PSF) in the pupil plane in a diffraction limited imaging system. This paper reports the study of radial as well as azimuthally variant polar Walsh filters and observation on their imaging characteristics near the focal plane of a rotationally symmetric imaging system.
Conference Presentations by Indrani Bhattacharya
European Optical Society (EOS) Topical Meeting on Diffractive Optics , 2019
Azimuthal Walsh filters are placed on the exit pupil plane of a rotationally symmetric imaging sy... more Azimuthal Walsh filters are placed on the exit pupil plane of a rotationally symmetric imaging system and the intensity distributions on the axially shifted image planes are studied by taking into consideration of the defocus aberration term.
Progress in Optomechatronic Technology - Proceedings of International Symposium on Optomechatronics (2018), 2018
Azimuthal Walsh filters derived from radially invariant azimuthal Walsh functions can be used as ... more Azimuthal Walsh filters derived from radially invariant azimuthal Walsh functions can be used as an effective tool for producing 2D and 3D light structures near the focal plane of a rotationally symmetric imaging system by manipulating the far-field diffraction characteristics when used as pupil filters. Starting with the definition of azimuthal Walsh functions and using the scalar diffrac-tion theory, this research work reports the possibility of modifying the beam structure around the far-field plane by diffraction characteristics of azimuthal Walsh filters placed on the exit pupil plane when computed analytically. The asymmetrical beam produced due to the inherent phase asymmetries introduced by azimuthal Walsh filters may find many important applications in micro-and nano-photonics.
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Papers by Indrani Bhattacharya
imaging system, the IPSF on this plane is the Airy pattern. In our study, each sector of the azimuthal Walsh aperture is masked by suitably oriented linear polarizers. The polarization phase introduced is a function of the state of polarization (SOP) of the input beam, the transmission axis of orientation of the masking polarizer and the orientation of the analyzer.
A feasible method to assess the degree of astigmatic compensation is to compute the IPSF at the plane of minimum astigmatic variance and compare the intensity distribution with that of airy pattern. IPSFs for different values of 𝑊22 are computed with the presence of compensating polarization masked azimuthal Walsh filters at 0° and 90° with input beam
parameters a=b=1 , 𝛿 = 90° and analyser kept at a particular angle. The results are compared with IPSFs computed for an unmasked lens and airy pattern.
functions can provide a viable and interesting tool for the
analysis and synthesis of microwave antenna and optical imaging systems. They can provide a convenient energy-efficient technique for tailoring of three dimensional point spread function near the focal plane of a rotationally symmetric imaging system. Starting with a brief description of the basic properties of azimuthal Walsh functions, this paper reports the generation of azimuthal Walsh filters along with their far-field diffraction characteristics for tailoring three dimensional point spread function near the focal plane of a rotationally symmetric imaging system.
Ph.D. Thesis by Indrani Bhattacharya
Practical implementation of these filters can be achievable by the availability of high-speed Spatial Light modulators where the in-situ generation of different orders of azimuthal Walsh filters are possible and combinations of lower orders filters to achieve higher orders may be explored. The lossless azimuthal Walsh filters are energy efficient and can be used to solve the problem of direct implementation of a finite number of constant as well as varying phase levels.
Further scope of research includes the use of azimuthal Walsh filters as phase-shifted zone plates to generate complex 3D beam structures like petal shaped and optical ring lattice beams. Azimuthal Walsh filters can be used very efficiently near the focus of an imaging system to cater the needs of 3D imaging, lithography, optical superresolution, optical tomography and so on. Optical micro- and macro-manipulations using azimuthal variant Walsh filters or combinations with radial variety can be used to form gradient force trap for optical tweezers for manipulating objects of size comparable to a single atom to 100µm without mechanical contact.
The two unique characteristics, namely, the orthogonality of azimuthal and radial Walsh filters and the self-similarity in different orders may be used to facilitate tackling of the inverse problem where a phase filter needs to be synthesized in accordance with pre-specified diffraction characteristics which may provide as an energy efficient solution to circumvent different problems related to Biology, Physics and Environmental issues.
Books by Indrani Bhattacharya
Symposium on Optomechatronic Technology (ISOT 2018) organized by the
International Society for Optomechatronics (ISOM) and Centro de Investigaciones
en Óptica (CIO) and held in Cancún, Quintana Roo, México, during November
5–8, 2018.
Symposium had topics relating to optical metrology, optical imaging/interferometry,
optical fiber sensors, polarization sensing and imaging, laser-based sensors, optical
sensors on robotics autonomous vehicles and other applications, optofluidics,
optomechatronics for sensing and imaging, micro-optoelectro-mechanical systems,
optical inspection for industry, adaptive optics, visual motion tracking and control,
biomedical applications, vision-based monitoring and control, optical manipulation and tweezers and their applications, material laser processing, actuators based on optics and optomechatronics, 3D processing, 3D fabrication and 3D printer, thin film technology, solar cell and two special sessions of polarization technology and sensors based on the use of lasers and fiber optics.
This collection of twenty-two chapters presents experimental and computational
investigations on important areas of optomechatronics. Symposium was intended to
be interdisciplinary forums for engineers, technicians, researchers and managers
involved in all fields of optics, optomechatronics, mechanics and mechanical
engineering.
students are included. The book is organized to enable easy access to various topics of interest. The first part includes the Keynote addresses by Phillip Russell, Max Planck Institute of the Light Sciences, Erlangen, Germany and Lorenzo Pavesi, University of Trento, Italy. The second part focuses on the Plenary Talks given by eminent scientists, namely, Azizur Rahman, City University London, London; Bishnu Pal, President, The Optical Society of India; Kamakhya Ghatak, National Institute of Technology, Agartala; Kehar Singh, Former Professor, Indian Institute of Technology Delhi; Mourad Zghal, SUPCOM, University of Carthage, Tunisia; Partha Roy Chaudhuri, IIT Kharagpur; S K. Bhadra, CSIR-Central Glass and Ceramic Research Institute, Kolkata; Sanjib Chatterjee, Raja Ramanna Centre for Advanced Technology, Indore; Takeo Sasaki, Tokyo University, Japan; Lakshminarayan Hazra, Emeritus Professor, University of Calcutta, Kolkata; Shyam Akashe, ITM University, Gwalior and Vasudevan Lakshminarayanan, University of Waterloo, Canada. The subsequent parts focus on topic-wise contributory papers in Application of Solar Energy; Diffraction Tomography; E.M. Radiation Theory and Antenna; Fibre Optics and Devices; Photonics for Space Applications; Micro-Electronics and VLSI; Nano-Photonics, Bio-Photonics and Bio-Medical Optics; Non-linear Phenomena and Chaos; Optical and Digital Data and Image Processing; Optical Communications and Networks; Optical Design; Opto-Electronic Devices; Opto-Electronic Materials and Quantum Optics and Information Processing.
Tigran Galstian, University of Laval, Canada, Motoharu Fujigaki, University of Fukui, Japan, Navin Kumar Nishchal, Indian Institute of Technology, Patna, India, Takeo Sasaki, Tokyo University of Science, Japan. The subsequent parts focuses on contributory papers sub-divided into four different tracks namely :
Track 1 : Silicon Photonics, Image Processing, Bio-Medical Optics
Track 2 : Fibre Optics, Photonics, Interferometry, Nano-Photonics
Track 3 : Holography, Solar Cells, Opto-electronic Materials
Track 4 : Optical Communications, Photonic Crystal Fibers
Book Chapters by Indrani Bhattacharya
Conference Presentations by Indrani Bhattacharya
imaging system, the IPSF on this plane is the Airy pattern. In our study, each sector of the azimuthal Walsh aperture is masked by suitably oriented linear polarizers. The polarization phase introduced is a function of the state of polarization (SOP) of the input beam, the transmission axis of orientation of the masking polarizer and the orientation of the analyzer.
A feasible method to assess the degree of astigmatic compensation is to compute the IPSF at the plane of minimum astigmatic variance and compare the intensity distribution with that of airy pattern. IPSFs for different values of 𝑊22 are computed with the presence of compensating polarization masked azimuthal Walsh filters at 0° and 90° with input beam
parameters a=b=1 , 𝛿 = 90° and analyser kept at a particular angle. The results are compared with IPSFs computed for an unmasked lens and airy pattern.
functions can provide a viable and interesting tool for the
analysis and synthesis of microwave antenna and optical imaging systems. They can provide a convenient energy-efficient technique for tailoring of three dimensional point spread function near the focal plane of a rotationally symmetric imaging system. Starting with a brief description of the basic properties of azimuthal Walsh functions, this paper reports the generation of azimuthal Walsh filters along with their far-field diffraction characteristics for tailoring three dimensional point spread function near the focal plane of a rotationally symmetric imaging system.
Practical implementation of these filters can be achievable by the availability of high-speed Spatial Light modulators where the in-situ generation of different orders of azimuthal Walsh filters are possible and combinations of lower orders filters to achieve higher orders may be explored. The lossless azimuthal Walsh filters are energy efficient and can be used to solve the problem of direct implementation of a finite number of constant as well as varying phase levels.
Further scope of research includes the use of azimuthal Walsh filters as phase-shifted zone plates to generate complex 3D beam structures like petal shaped and optical ring lattice beams. Azimuthal Walsh filters can be used very efficiently near the focus of an imaging system to cater the needs of 3D imaging, lithography, optical superresolution, optical tomography and so on. Optical micro- and macro-manipulations using azimuthal variant Walsh filters or combinations with radial variety can be used to form gradient force trap for optical tweezers for manipulating objects of size comparable to a single atom to 100µm without mechanical contact.
The two unique characteristics, namely, the orthogonality of azimuthal and radial Walsh filters and the self-similarity in different orders may be used to facilitate tackling of the inverse problem where a phase filter needs to be synthesized in accordance with pre-specified diffraction characteristics which may provide as an energy efficient solution to circumvent different problems related to Biology, Physics and Environmental issues.
Symposium on Optomechatronic Technology (ISOT 2018) organized by the
International Society for Optomechatronics (ISOM) and Centro de Investigaciones
en Óptica (CIO) and held in Cancún, Quintana Roo, México, during November
5–8, 2018.
Symposium had topics relating to optical metrology, optical imaging/interferometry,
optical fiber sensors, polarization sensing and imaging, laser-based sensors, optical
sensors on robotics autonomous vehicles and other applications, optofluidics,
optomechatronics for sensing and imaging, micro-optoelectro-mechanical systems,
optical inspection for industry, adaptive optics, visual motion tracking and control,
biomedical applications, vision-based monitoring and control, optical manipulation and tweezers and their applications, material laser processing, actuators based on optics and optomechatronics, 3D processing, 3D fabrication and 3D printer, thin film technology, solar cell and two special sessions of polarization technology and sensors based on the use of lasers and fiber optics.
This collection of twenty-two chapters presents experimental and computational
investigations on important areas of optomechatronics. Symposium was intended to
be interdisciplinary forums for engineers, technicians, researchers and managers
involved in all fields of optics, optomechatronics, mechanics and mechanical
engineering.
students are included. The book is organized to enable easy access to various topics of interest. The first part includes the Keynote addresses by Phillip Russell, Max Planck Institute of the Light Sciences, Erlangen, Germany and Lorenzo Pavesi, University of Trento, Italy. The second part focuses on the Plenary Talks given by eminent scientists, namely, Azizur Rahman, City University London, London; Bishnu Pal, President, The Optical Society of India; Kamakhya Ghatak, National Institute of Technology, Agartala; Kehar Singh, Former Professor, Indian Institute of Technology Delhi; Mourad Zghal, SUPCOM, University of Carthage, Tunisia; Partha Roy Chaudhuri, IIT Kharagpur; S K. Bhadra, CSIR-Central Glass and Ceramic Research Institute, Kolkata; Sanjib Chatterjee, Raja Ramanna Centre for Advanced Technology, Indore; Takeo Sasaki, Tokyo University, Japan; Lakshminarayan Hazra, Emeritus Professor, University of Calcutta, Kolkata; Shyam Akashe, ITM University, Gwalior and Vasudevan Lakshminarayanan, University of Waterloo, Canada. The subsequent parts focus on topic-wise contributory papers in Application of Solar Energy; Diffraction Tomography; E.M. Radiation Theory and Antenna; Fibre Optics and Devices; Photonics for Space Applications; Micro-Electronics and VLSI; Nano-Photonics, Bio-Photonics and Bio-Medical Optics; Non-linear Phenomena and Chaos; Optical and Digital Data and Image Processing; Optical Communications and Networks; Optical Design; Opto-Electronic Devices; Opto-Electronic Materials and Quantum Optics and Information Processing.
Tigran Galstian, University of Laval, Canada, Motoharu Fujigaki, University of Fukui, Japan, Navin Kumar Nishchal, Indian Institute of Technology, Patna, India, Takeo Sasaki, Tokyo University of Science, Japan. The subsequent parts focuses on contributory papers sub-divided into four different tracks namely :
Track 1 : Silicon Photonics, Image Processing, Bio-Medical Optics
Track 2 : Fibre Optics, Photonics, Interferometry, Nano-Photonics
Track 3 : Holography, Solar Cells, Opto-electronic Materials
Track 4 : Optical Communications, Photonic Crystal Fibers