Optical fiber tapers are used to collect photoluminescence emission at ~1.5 um from photonic crys... more Optical fiber tapers are used to collect photoluminescence emission at ~1.5 um from photonic crystal cavities fabricated in erbium doped silicon nitride on silicon. Photoluminescence collection via fiber taper is enhanced 2.5 times relative to free space, with a total taper collection efficiency of 53%. By varying the fiber taper offset from the cavity, a broad tuning range of coupling strength is obtained. This material system combined with fiber taper collection is promising for building onchip optical amplifiers.
This work reports experiments concerning specific application of laser-produced plasma at IPPLM i... more This work reports experiments concerning specific application of laser-produced plasma at IPPLM in Warsaw. A repetitive pulse laser system of parameters: energy up to 0.8 J in a 3.5 ns-pulse, wavelength of 1.06 μm, repetition rate of up to 10 Hz, has been employed in these investigations. The characterisation of laser-produced plasma was performed with the use of “time-of-flight” ion diagnostics simultaneously with other diagnostic methods. The results of laser-matter interaction were obtained in dependence on laser pulse parameters, ...
We show via numerical simulations that the absorption and solar energy conversion efficiency of a... more We show via numerical simulations that the absorption and solar energy conversion efficiency of a thin-film photovoltaic (PV) cell can be significantly enhanced by embedding it into an optical cavity. A reflective hemi-ellipsoid with an aperture for sunlight placed over a tilted PV cell reflects unabsorbed photons back to the cell, allowing for multiple opportunities for absorption. Ray tracing simulations predict that with the proposed cavity a textured thin-film silicon cell can exceed the Yablonovitch (Lambertian) limit for absorption across a broad wavelength range, while the performance of the cavity-embedded planar PV cell approaches that of the cell with the surface texturing.
Frontiers in Optics 2012/Laser Science XXVIII, 2012
This talk will first discuss experimental progress on light-trapping in crystalline silicon thin ... more This talk will first discuss experimental progress on light-trapping in crystalline silicon thin films with nanostructured surfaces and fabrication of solar cells on such thin films, followed by discussion of thermodynamic processes in photovoltaics.
ABSTRACT We introduce a concept of light trapping on the nanoscale via pinning optical vortices t... more ABSTRACT We introduce a concept of light trapping on the nanoscale via pinning optical vortices to optimally-designed nanostructures, reveal this mechanism behind known focusing phenomena, and offer new approaches to design nanophotonic platforms and/or coupling schemes.
3rd IEEE International Conference on Group IV Photonics, 2006., 2006
Abstract Photoluminescence properties of silicon nanocrystals embedded in five different oxide ma... more Abstract Photoluminescence properties of silicon nanocrystals embedded in five different oxide matrices are analyzed. Samples are silicon rich oxide and oxynitride produced by PECVD and ion implantation and crystalline and amorphous aluminum oxide implanted with silicon
Crystalline silicon solar cells, only 10 μm thick, with a peak conversion efficiency of 15.7% are... more Crystalline silicon solar cells, only 10 μm thick, with a peak conversion efficiency of 15.7% are reported by G. Chen and co-workers on page 2182. Efficient crystalline silicon photovoltaics of such thinness are enabled by an advanced light-trapping design incorporating a two-dimensional inverted pyramid photonic crystal.
Advanced materials (Deerfield Beach, Fla.), Jan 18, 2015
Only ten micrometer thick crystalline silicon solar cells deliver a short-circuit current of 34.5... more Only ten micrometer thick crystalline silicon solar cells deliver a short-circuit current of 34.5 mA cm(-2) and power conversion efficiency of 15.7%. The record performance for a crystalline silicon solar cell of such thinness is enabled by an advanced light-trapping design incorporating a 2D inverted pyramid photonic crystal and a rear dielectric/reflector stack.
Frontiers in Optics 2009/Laser Science XXV/Fall 2009 OSA Optics & Photonics Technical Digest, 2009
Jelena Vuckovic1, Maria Makarova1, Yiyang Gong1, Selcuk Yerci2, Rui Li2, and Luca Dal Negro2 1 De... more Jelena Vuckovic1, Maria Makarova1, Yiyang Gong1, Selcuk Yerci2, Rui Li2, and Luca Dal Negro2 1 Department of Electrical Engineering and Ginzton Laboratory, Stanford University, Stanford, CA 94305-4088 2 Department of Electrical and Computer Engineering, Boston University, Boston, MA 02215, USA Phone: 1-650-725-2288. Fax: 1-650-723-5320. E-mail: [email protected], http://www.stanford.edu/group/nqp ... Abstract: We demonstrated enhancement of light emission from Er-doped silicon photonic crystal cavities, as well as cavity linewidth ...
Optical fiber tapers are used to collect photoluminescence emission at ~1.5 um from photonic crys... more Optical fiber tapers are used to collect photoluminescence emission at ~1.5 um from photonic crystal cavities fabricated in erbium doped silicon nitride on silicon. Photoluminescence collection via fiber taper is enhanced 2.5 times relative to free space, with a total taper collection efficiency of 53%. By varying the fiber taper offset from the cavity, a broad tuning range of coupling strength is obtained. This material system combined with fiber taper collection is promising for building onchip optical amplifiers.
This work reports experiments concerning specific application of laser-produced plasma at IPPLM i... more This work reports experiments concerning specific application of laser-produced plasma at IPPLM in Warsaw. A repetitive pulse laser system of parameters: energy up to 0.8 J in a 3.5 ns-pulse, wavelength of 1.06 μm, repetition rate of up to 10 Hz, has been employed in these investigations. The characterisation of laser-produced plasma was performed with the use of “time-of-flight” ion diagnostics simultaneously with other diagnostic methods. The results of laser-matter interaction were obtained in dependence on laser pulse parameters, ...
We show via numerical simulations that the absorption and solar energy conversion efficiency of a... more We show via numerical simulations that the absorption and solar energy conversion efficiency of a thin-film photovoltaic (PV) cell can be significantly enhanced by embedding it into an optical cavity. A reflective hemi-ellipsoid with an aperture for sunlight placed over a tilted PV cell reflects unabsorbed photons back to the cell, allowing for multiple opportunities for absorption. Ray tracing simulations predict that with the proposed cavity a textured thin-film silicon cell can exceed the Yablonovitch (Lambertian) limit for absorption across a broad wavelength range, while the performance of the cavity-embedded planar PV cell approaches that of the cell with the surface texturing.
Frontiers in Optics 2012/Laser Science XXVIII, 2012
This talk will first discuss experimental progress on light-trapping in crystalline silicon thin ... more This talk will first discuss experimental progress on light-trapping in crystalline silicon thin films with nanostructured surfaces and fabrication of solar cells on such thin films, followed by discussion of thermodynamic processes in photovoltaics.
ABSTRACT We introduce a concept of light trapping on the nanoscale via pinning optical vortices t... more ABSTRACT We introduce a concept of light trapping on the nanoscale via pinning optical vortices to optimally-designed nanostructures, reveal this mechanism behind known focusing phenomena, and offer new approaches to design nanophotonic platforms and/or coupling schemes.
3rd IEEE International Conference on Group IV Photonics, 2006., 2006
Abstract Photoluminescence properties of silicon nanocrystals embedded in five different oxide ma... more Abstract Photoluminescence properties of silicon nanocrystals embedded in five different oxide matrices are analyzed. Samples are silicon rich oxide and oxynitride produced by PECVD and ion implantation and crystalline and amorphous aluminum oxide implanted with silicon
Crystalline silicon solar cells, only 10 μm thick, with a peak conversion efficiency of 15.7% are... more Crystalline silicon solar cells, only 10 μm thick, with a peak conversion efficiency of 15.7% are reported by G. Chen and co-workers on page 2182. Efficient crystalline silicon photovoltaics of such thinness are enabled by an advanced light-trapping design incorporating a two-dimensional inverted pyramid photonic crystal.
Advanced materials (Deerfield Beach, Fla.), Jan 18, 2015
Only ten micrometer thick crystalline silicon solar cells deliver a short-circuit current of 34.5... more Only ten micrometer thick crystalline silicon solar cells deliver a short-circuit current of 34.5 mA cm(-2) and power conversion efficiency of 15.7%. The record performance for a crystalline silicon solar cell of such thinness is enabled by an advanced light-trapping design incorporating a 2D inverted pyramid photonic crystal and a rear dielectric/reflector stack.
Frontiers in Optics 2009/Laser Science XXV/Fall 2009 OSA Optics & Photonics Technical Digest, 2009
Jelena Vuckovic1, Maria Makarova1, Yiyang Gong1, Selcuk Yerci2, Rui Li2, and Luca Dal Negro2 1 De... more Jelena Vuckovic1, Maria Makarova1, Yiyang Gong1, Selcuk Yerci2, Rui Li2, and Luca Dal Negro2 1 Department of Electrical Engineering and Ginzton Laboratory, Stanford University, Stanford, CA 94305-4088 2 Department of Electrical and Computer Engineering, Boston University, Boston, MA 02215, USA Phone: 1-650-725-2288. Fax: 1-650-723-5320. E-mail: [email protected], http://www.stanford.edu/group/nqp ... Abstract: We demonstrated enhancement of light emission from Er-doped silicon photonic crystal cavities, as well as cavity linewidth ...
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