It is shown that imaging with a quasi Gaussian beam (electron or laser microlithography) in thin ... more It is shown that imaging with a quasi Gaussian beam (electron or laser microlithography) in thin resist layers is equivalent to a diffusion process. Therefore when the spot size is of the order of the dimension of the sought feature, the image rendered by the convolution of the beam with the said feature obeys the steady state Laplace equation. Hence, we investigate the use of harmonic functions in an attempt to increase the acuity of the image. Working through the mathematical analysis and simulations we show that a certain mapping reminiscent of a 'conformal mapping' improves the acuity of the image in the corners. Experimental results support our conjecture.
It is shown that imaging with a quasi Gaussian beam (electron or laser microlithography) in thin ... more It is shown that imaging with a quasi Gaussian beam (electron or laser microlithography) in thin resist layers is equivalent to a diffusion process. Therefore when the spot size is of the order of the dimension of the sought feature, the image rendered by the convolution of the beam with the said feature obeys the steady state Laplace equation. Hence,
Electroencephalography and Clinical Neurophysiology, 1998
Automated detection algorithms of EEG seizures or similar clinical events typically analyze a fin... more Automated detection algorithms of EEG seizures or similar clinical events typically analyze a finite epoch a given channel at a time, producing a probability or a weight estimating how likely it is for the event to resemble a clinical pattern. Epochs are normally shorter than the duration of a seizure, which may spread to more than one electrode. This may result in a weak correspondence between the seizure pattern in the record and its calculated detector event counterpart. As a result, such algorithms suffer from a high rate of false detections. We show that the weights/probabilities of a generic detector can be described as a weight function embedded in a directed graph (digraph). Extended objects such as seizures therefore correspond to the connected components of the digraph. We introduce a clustering algorithm that accounts for the shortcomings of a generic detector of the type described above. By correlating detector results with respect to both time and channel, we effectively extend the detection to an unlimited number of electrodes over an indefinite time. The algorithm is fast (linear - O(m)) and may be implemented in real time. We argue that the algorithm enhances the detection of seizure onset and lowers the rate of false detections. Preliminary results demonstrate a strong correlation between the seizure and the cluster's boundaries and over 50% reduction of false detection rate.
24th Annual BACUS Symposium on Photomask Technology, 2004
We show that a conformal mapping of the type, W = z pi/alpha, describes how a shape of a 45° rota... more We show that a conformal mapping of the type, W = z pi/alpha, describes how a shape of a 45° rotated cross transforms into a contact hole. We discuss its relevance to corner rounding seen on raster beam pattern generators.
S ABACHI, B ABBOTT, M ABOLINS, BS ACHARYA, I ADAM, M ADAMS, S AHN, H AIHARA, G ALVAREZ, GA ALVES,... more S ABACHI, B ABBOTT, M ABOLINS, BS ACHARYA, I ADAM, M ADAMS, S AHN, H AIHARA, G ALVAREZ, GA ALVES, N AMOS, EW ANDERSON, YU ANTIPOV, SH ARONSON, R ASTUR, RE AVERY, A BADEN, V BALAMURALI, J BALDERSTON, B BALDIN, J BANTLY, JF ...
Photomask and Next-Generation Lithography Mask Technology XI, 2004
The ALTA 4300 system has been used to successfully write many advanced designs previously only po... more The ALTA 4300 system has been used to successfully write many advanced designs previously only possible with 50kV VSB systems. In order to further enlarge the application space of this high productivity system, an aerial image enhancement technique has been ...
Quantum Chromodyanamics (QCD), the theory of quarks and gluons, has been remarkably successful in... more Quantum Chromodyanamics (QCD), the theory of quarks and gluons, has been remarkably successful in the quantitative description of a large variety of seemingly diverse phenomena in particle physics. QCD describes strong interactions, which are characterized by a single free parameter, the strong coupling constant α{sub s}. The coupling constant is a measure of the strength of the strong force at the interaction vertex. It depends on q², the square of the four momentum transfer to the gluon, and is the QCD counter part to the fine structure constant α. It is generally accepted that e{sup +}eâ» annihilation experiments provide an ideal testing ground for QCD theory. An investigation of e{sup +}â» â hadronic events observed in the CLEO detector operating at the Cornell Electron Storage Ring (CESR) at an average center of mass energy of 10.5 GeV will be presented. By studying the hadronic jet structure, the value of α{sub s} is determined to be a α{sub s} = .138 {plus minus} .010 ...
We h a ve searched for a heavy neutral gauge boson, Z 0 , using the decay channel Z 0 ! ee. The d... more We h a ve searched for a heavy neutral gauge boson, Z 0 , using the decay channel Z 0 ! ee. The data were collected with the D detector at the Fermilab Tevatron during the 1992 1993 pp collider run at p s = 1 :8 T eV from an integrated luminosity o f 1 5 1 p b ,1 . Limits are set on the cross section times branching ratio for the process pp ! Z 0 ! ee as a function of the Z 0 mass. We exclude the existence of a Z 0 of mass less than 490 GeV c 2 , assuming a Z 0 with the same coupling strengths to quarks and leptons as the standard model Z boson.
The distribution of the transverse energy in jets has been measured in collisions at TeV using th... more The distribution of the transverse energy in jets has been measured in collisions at TeV using the DØ detector at Fermilab. This measurement of the jet shape is made as a function of jet transverse energy in both the central and forward rapidity regions. Jets are shown to narrow both ...
It is shown that imaging with a quasi Gaussian beam (electron or laser microlithography) in thin ... more It is shown that imaging with a quasi Gaussian beam (electron or laser microlithography) in thin resist layers is equivalent to a diffusion process. Therefore when the spot size is of the order of the dimension of the sought feature, the image rendered by the convolution of the beam with the said feature obeys the steady state Laplace equation. Hence, we investigate the use of harmonic functions in an attempt to increase the acuity of the image. Working through the mathematical analysis and simulations we show that a certain mapping reminiscent of a 'conformal mapping' improves the acuity of the image in the corners. Experimental results support our conjecture.
It is shown that imaging with a quasi Gaussian beam (electron or laser microlithography) in thin ... more It is shown that imaging with a quasi Gaussian beam (electron or laser microlithography) in thin resist layers is equivalent to a diffusion process. Therefore when the spot size is of the order of the dimension of the sought feature, the image rendered by the convolution of the beam with the said feature obeys the steady state Laplace equation. Hence,
Electroencephalography and Clinical Neurophysiology, 1998
Automated detection algorithms of EEG seizures or similar clinical events typically analyze a fin... more Automated detection algorithms of EEG seizures or similar clinical events typically analyze a finite epoch a given channel at a time, producing a probability or a weight estimating how likely it is for the event to resemble a clinical pattern. Epochs are normally shorter than the duration of a seizure, which may spread to more than one electrode. This may result in a weak correspondence between the seizure pattern in the record and its calculated detector event counterpart. As a result, such algorithms suffer from a high rate of false detections. We show that the weights/probabilities of a generic detector can be described as a weight function embedded in a directed graph (digraph). Extended objects such as seizures therefore correspond to the connected components of the digraph. We introduce a clustering algorithm that accounts for the shortcomings of a generic detector of the type described above. By correlating detector results with respect to both time and channel, we effectively extend the detection to an unlimited number of electrodes over an indefinite time. The algorithm is fast (linear - O(m)) and may be implemented in real time. We argue that the algorithm enhances the detection of seizure onset and lowers the rate of false detections. Preliminary results demonstrate a strong correlation between the seizure and the cluster's boundaries and over 50% reduction of false detection rate.
24th Annual BACUS Symposium on Photomask Technology, 2004
We show that a conformal mapping of the type, W = z pi/alpha, describes how a shape of a 45° rota... more We show that a conformal mapping of the type, W = z pi/alpha, describes how a shape of a 45° rotated cross transforms into a contact hole. We discuss its relevance to corner rounding seen on raster beam pattern generators.
S ABACHI, B ABBOTT, M ABOLINS, BS ACHARYA, I ADAM, M ADAMS, S AHN, H AIHARA, G ALVAREZ, GA ALVES,... more S ABACHI, B ABBOTT, M ABOLINS, BS ACHARYA, I ADAM, M ADAMS, S AHN, H AIHARA, G ALVAREZ, GA ALVES, N AMOS, EW ANDERSON, YU ANTIPOV, SH ARONSON, R ASTUR, RE AVERY, A BADEN, V BALAMURALI, J BALDERSTON, B BALDIN, J BANTLY, JF ...
Photomask and Next-Generation Lithography Mask Technology XI, 2004
The ALTA 4300 system has been used to successfully write many advanced designs previously only po... more The ALTA 4300 system has been used to successfully write many advanced designs previously only possible with 50kV VSB systems. In order to further enlarge the application space of this high productivity system, an aerial image enhancement technique has been ...
Quantum Chromodyanamics (QCD), the theory of quarks and gluons, has been remarkably successful in... more Quantum Chromodyanamics (QCD), the theory of quarks and gluons, has been remarkably successful in the quantitative description of a large variety of seemingly diverse phenomena in particle physics. QCD describes strong interactions, which are characterized by a single free parameter, the strong coupling constant α{sub s}. The coupling constant is a measure of the strength of the strong force at the interaction vertex. It depends on q², the square of the four momentum transfer to the gluon, and is the QCD counter part to the fine structure constant α. It is generally accepted that e{sup +}eâ» annihilation experiments provide an ideal testing ground for QCD theory. An investigation of e{sup +}â» â hadronic events observed in the CLEO detector operating at the Cornell Electron Storage Ring (CESR) at an average center of mass energy of 10.5 GeV will be presented. By studying the hadronic jet structure, the value of α{sub s} is determined to be a α{sub s} = .138 {plus minus} .010 ...
We h a ve searched for a heavy neutral gauge boson, Z 0 , using the decay channel Z 0 ! ee. The d... more We h a ve searched for a heavy neutral gauge boson, Z 0 , using the decay channel Z 0 ! ee. The data were collected with the D detector at the Fermilab Tevatron during the 1992 1993 pp collider run at p s = 1 :8 T eV from an integrated luminosity o f 1 5 1 p b ,1 . Limits are set on the cross section times branching ratio for the process pp ! Z 0 ! ee as a function of the Z 0 mass. We exclude the existence of a Z 0 of mass less than 490 GeV c 2 , assuming a Z 0 with the same coupling strengths to quarks and leptons as the standard model Z boson.
The distribution of the transverse energy in jets has been measured in collisions at TeV using th... more The distribution of the transverse energy in jets has been measured in collisions at TeV using the DØ detector at Fermilab. This measurement of the jet shape is made as a function of jet transverse energy in both the central and forward rapidity regions. Jets are shown to narrow both ...
We demonstrate that although both quantum mechanics and general relativity describe the motion of... more We demonstrate that although both quantum mechanics and general relativity describe the motion of a photon in spacetime in accord with each other, gravitational redshift does not categorically respect the Heisenberg uncertainty principle. We further argue that the violation of the Heisenberg uncertainty principle can be extended to entangled photons, and we propose an experimental setup to test whether entanglement in continuous variables holds under gravitational redshift.
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Papers by Asher Klatchko