P. Priya, Anne Rodriguez, O. Ortiz, A. Lemaître, M. Esmann, N. Lanzillotti-Kimura
GaAs/AlAs heterostructures constitute a unique platform for the conception, engineering, and implementation of opto-phononic systems. In addition to all the accumulated know-how inherited from the optoelectronics industry, a unique coincidence in the contrasts of the optical and acoustic impedances, and the speeds of light and sound, enable a perfect colocalization of the optical electric and acoustic displacement fields. We present the design principles for GaAs/AlAs opto-phononic heterostructures supporting topological interface modes and further analyse the performance of these structures in the optical and the acoustic domain.
{"title":"Simultaneous confinement of acoustic phonons and near infrared photons in GaAs/AlAs multilayers by band inversion","authors":"P. Priya, Anne Rodriguez, O. Ortiz, A. Lemaître, M. Esmann, N. Lanzillotti-Kimura","doi":"10.1117/12.2633360","DOIUrl":"https://doi.org/10.1117/12.2633360","url":null,"abstract":"GaAs/AlAs heterostructures constitute a unique platform for the conception, engineering, and implementation of opto-phononic systems. In addition to all the accumulated know-how inherited from the optoelectronics industry, a unique coincidence in the contrasts of the optical and acoustic impedances, and the speeds of light and sound, enable a perfect colocalization of the optical electric and acoustic displacement fields. We present the design principles for GaAs/AlAs opto-phononic heterostructures supporting topological interface modes and further analyse the performance of these structures in the optical and the acoustic domain.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74955540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. B. Coyle, M. Mullin, P. Stysley, Michael J. Hersh, B. James, M. Trainer
NASA’s Dragonfly mission will sample surface materials from multiple sites on Saturn’s largest moon, Titan, in exploration of its potential for prebiotic chemistry. We are developing and delivering a compact pulsed UV laser transmitter, developed in-house at NASA’s Goddard Space Flight Center, capable of directing programmable 266 nm pulse energies to a small sample of surface material for laser desorption mass spectrometry (LDMS) performed by the on-board Dragonfly Mass Spectrometer (DraMS). The mail goal for this effort was to develop a flight-capable, two-part design, employing a remotely located fiber coupled pumping source, and a UV transmitter unit that can operate in short bursts with minimal change in laser pulse characteristics such as beam quality, pointing, energy, and pulse width. The DraMS UV source will require a 7+ year transit to the Saturn system; where upon deployment on Titan’s surface, must demonstrate a combination of survivability, reliability, operational capability, and performance yet developed in a flight-qualified solid-state laser transmitter. Once Dragonfly is safely operational, the Titan Hydrocarbon Analysis Nanosecond Optical Source (THANOS) UV laser will perform for 3+ years in Titan’s extreme surface and atmospheric conditions in several locations.
{"title":"Development of a programmable UV laser source for the Dragonfly Mass Spectrometer (DraMS)","authors":"D. B. Coyle, M. Mullin, P. Stysley, Michael J. Hersh, B. James, M. Trainer","doi":"10.1117/12.2644728","DOIUrl":"https://doi.org/10.1117/12.2644728","url":null,"abstract":"NASA’s Dragonfly mission will sample surface materials from multiple sites on Saturn’s largest moon, Titan, in exploration of its potential for prebiotic chemistry. We are developing and delivering a compact pulsed UV laser transmitter, developed in-house at NASA’s Goddard Space Flight Center, capable of directing programmable 266 nm pulse energies to a small sample of surface material for laser desorption mass spectrometry (LDMS) performed by the on-board Dragonfly Mass Spectrometer (DraMS). The mail goal for this effort was to develop a flight-capable, two-part design, employing a remotely located fiber coupled pumping source, and a UV transmitter unit that can operate in short bursts with minimal change in laser pulse characteristics such as beam quality, pointing, energy, and pulse width. The DraMS UV source will require a 7+ year transit to the Saturn system; where upon deployment on Titan’s surface, must demonstrate a combination of survivability, reliability, operational capability, and performance yet developed in a flight-qualified solid-state laser transmitter. Once Dragonfly is safely operational, the Titan Hydrocarbon Analysis Nanosecond Optical Source (THANOS) UV laser will perform for 3+ years in Titan’s extreme surface and atmospheric conditions in several locations.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84447846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. Bendoym, Lori A. Lepak, J. Leitch, J. Applegate, D. Crouse
The health of Earth’s atmosphere and its ecosystems are of vital importance to humanity. To assess the current state of the atmosphere and its rate of degradation, the monitoring of atmospheric gasses and particulates is necessary. The development of next-generation Low size, weight, and power (SWaP) sensors and instruments which are required for this task is a high priority for NASA’s Earth Science Technology Office (ESTO). The primary tool to monitor atmospheric gasses is hyperspectral imaging (HSI). Current HSI systems are composed of a large and complex assortment of lenses, filters and cameras that are large, heavy, expensive, and intolerant to physical shocks—all things that make them challenging for use in space-based sensing and imaging applications. As an alternative, a Low SWaP sensor is made possible by integrating a compact HSI sensor onto a CubeSat or SmallSat platform, which is much cheaper to deploy vs. a conventional satellite. To facilitate this, metamaterials are employed at the detector level to reduce the optical components required for HSI, while still providing comparable performance. The metamaterial studied here replaces a conventional grating disperser in a HSI system, by being compatible with a focused beam (fast optics) while spectrally filtering a particular spectral channel.
{"title":"Low SWaP hyperspectral imaging sensor for CubeSat applications","authors":"I. Bendoym, Lori A. Lepak, J. Leitch, J. Applegate, D. Crouse","doi":"10.1117/12.2633886","DOIUrl":"https://doi.org/10.1117/12.2633886","url":null,"abstract":"The health of Earth’s atmosphere and its ecosystems are of vital importance to humanity. To assess the current state of the atmosphere and its rate of degradation, the monitoring of atmospheric gasses and particulates is necessary. The development of next-generation Low size, weight, and power (SWaP) sensors and instruments which are required for this task is a high priority for NASA’s Earth Science Technology Office (ESTO). The primary tool to monitor atmospheric gasses is hyperspectral imaging (HSI). Current HSI systems are composed of a large and complex assortment of lenses, filters and cameras that are large, heavy, expensive, and intolerant to physical shocks—all things that make them challenging for use in space-based sensing and imaging applications. As an alternative, a Low SWaP sensor is made possible by integrating a compact HSI sensor onto a CubeSat or SmallSat platform, which is much cheaper to deploy vs. a conventional satellite. To facilitate this, metamaterials are employed at the detector level to reduce the optical components required for HSI, while still providing comparable performance. The metamaterial studied here replaces a conventional grating disperser in a HSI system, by being compatible with a focused beam (fast optics) while spectrally filtering a particular spectral channel.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80914288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lars Forberger, R. G. Felsted, Alexander B. Bard, Danika R. Luntz-Martin, A. N. Vamivakas, P. Pauzauskie
Negatively charged nitrogen-vacancy (NV-) centers in diamond have a plethora of potential applications in quantum systems, including sensing and computing1-3. Photothermal heating can limit the utility of NV- center nanodiamonds, especially under high laser irradiances4-6. A composite of nanodiamonds with NV- defects and ytterbium-doped cubic sodium yttrium fluoride (Yb:α-NaYF4 or NaYF) could offset the photothermal heating of nanodiamonds by the anti-Stokes fluorescence cooling of Yb3+ ions7. We present a novel preparation method for generating a NV- diamond NaYF composite material based on a hydrothermal synthesis approach. Particle size was determined to be 230 ± 90 nm by SEM, and DLS data show a permanent connection between nanodiamonds and NaYF. Nanodiamonds are observed on the surfaces of NaYF materials. Nanodiamonds may also be incorporated within the body of individual NaYF grains, however the question of whether nanodiamonds are fully incorporated into the host NaYF material remains to be answered. The temperatures of host material and NV- defects are accessed using mean fluorescence wavelength shifts and Debye-Waller factor thermometry respectively. The obtained temperature changes with increasing 1020 nm irradiance show good agreement. Two data sets showed photothermal heating of around 10 and 13 K at 6.3 MW/cm2. Increased particle smoothness and sizes could lead to coolable composite materials.
{"title":"Synthesis and thermometry of NV- nanodiamond α-NaYF4 composite nanostructures","authors":"Lars Forberger, R. G. Felsted, Alexander B. Bard, Danika R. Luntz-Martin, A. N. Vamivakas, P. Pauzauskie","doi":"10.1117/12.2635913","DOIUrl":"https://doi.org/10.1117/12.2635913","url":null,"abstract":"Negatively charged nitrogen-vacancy (NV-) centers in diamond have a plethora of potential applications in quantum systems, including sensing and computing1-3. Photothermal heating can limit the utility of NV- center nanodiamonds, especially under high laser irradiances4-6. A composite of nanodiamonds with NV- defects and ytterbium-doped cubic sodium yttrium fluoride (Yb:α-NaYF4 or NaYF) could offset the photothermal heating of nanodiamonds by the anti-Stokes fluorescence cooling of Yb3+ ions7. We present a novel preparation method for generating a NV- diamond NaYF composite material based on a hydrothermal synthesis approach. Particle size was determined to be 230 ± 90 nm by SEM, and DLS data show a permanent connection between nanodiamonds and NaYF. Nanodiamonds are observed on the surfaces of NaYF materials. Nanodiamonds may also be incorporated within the body of individual NaYF grains, however the question of whether nanodiamonds are fully incorporated into the host NaYF material remains to be answered. The temperatures of host material and NV- defects are accessed using mean fluorescence wavelength shifts and Debye-Waller factor thermometry respectively. The obtained temperature changes with increasing 1020 nm irradiance show good agreement. Two data sets showed photothermal heating of around 10 and 13 K at 6.3 MW/cm2. Increased particle smoothness and sizes could lead to coolable composite materials.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84173720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sujan Aryal, D. Biswas, R. Mehta, I. Mahbub, A. Kaul
Sensing temperature is important for a wide variety of applications such as control systems and instrumentation which are integral to various industrial sectors and in research settings. To date, many prior studies have favored the use of the resistive thermistor approach given its simplicity. However, such devices are less sensitive to temperature changes compared to frequency-dependent approaches which are gaining momentum for detection. The importance of high sensitivity and reliable methods using a frequency-based approach for detecting temperature changes should thus be apparent, particularly if such sensors are also fabricated using low-cost approaches which are amenable toward miniaturized wireless platforms at the same time. In this study, Au rectangular single-arm spiral antennas with varying sizes were fabricated and RF S-parameter measurements were conducted over the frequency range of 300 kHz to 20 GHz. Solution-processed, two-dimensional (2D) hexagonal boron nitride (h-BN) was used with cyclohexanone and terpineol as solvents, and the films were characterized using dc current-voltage and frequency-dependent capacitance measurements. We also characterized our solution-processed h-BN films using Raman spectroscopy. The shift in the resonant frequency through the addition of h-BN over the underlying Au antenna was observed as this dielectric was coated on top of the antennas and the temperature response of the resonance frequency was measured. Alongside the experimental measurements, we also present results from our simulation analysis conducted using High Frequency Structure Simulator (HFSS) from ANSYS.
{"title":"Solution-processed dielectric films and Au RF antenna for temperature sensing","authors":"Sujan Aryal, D. Biswas, R. Mehta, I. Mahbub, A. Kaul","doi":"10.1117/12.2633159","DOIUrl":"https://doi.org/10.1117/12.2633159","url":null,"abstract":"Sensing temperature is important for a wide variety of applications such as control systems and instrumentation which are integral to various industrial sectors and in research settings. To date, many prior studies have favored the use of the resistive thermistor approach given its simplicity. However, such devices are less sensitive to temperature changes compared to frequency-dependent approaches which are gaining momentum for detection. The importance of high sensitivity and reliable methods using a frequency-based approach for detecting temperature changes should thus be apparent, particularly if such sensors are also fabricated using low-cost approaches which are amenable toward miniaturized wireless platforms at the same time. In this study, Au rectangular single-arm spiral antennas with varying sizes were fabricated and RF S-parameter measurements were conducted over the frequency range of 300 kHz to 20 GHz. Solution-processed, two-dimensional (2D) hexagonal boron nitride (h-BN) was used with cyclohexanone and terpineol as solvents, and the films were characterized using dc current-voltage and frequency-dependent capacitance measurements. We also characterized our solution-processed h-BN films using Raman spectroscopy. The shift in the resonant frequency through the addition of h-BN over the underlying Au antenna was observed as this dielectric was coated on top of the antennas and the temperature response of the resonance frequency was measured. Alongside the experimental measurements, we also present results from our simulation analysis conducted using High Frequency Structure Simulator (HFSS) from ANSYS.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78891434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. Yang, Hung-I Lin, M. Shalaginov, Katherine Stoll, S. An, C. Rivero‐Baleine, M. Kang, A. Agarwal, K. Richardson, Hualiang Zhang, Juejun Hu, T. Gu
Zoom lenses with adjustable focal lengths and magnification ratios are an crucial part for many optical imaging systems. Conventional zoom lenses comprise multiple refractive optics. Optical zoom is achieved with translational motion of multiple lens elements, which inevitably increases module size, cost, and complexity. Here, we present a zoom lens design based on multi-functional optical metasurfaces. It achieves large zoom ratios with diffraction-limited quality and minimal distortion. Also, it requires no mechanical moving parts. We demonstrate the concept with two embodiments, one in the visible with polarization-multiplexing, and the other in the mid-infrared with phase change materials. Both of them achieve 10x parfocal zoom consistent with the design.
{"title":"Non-mechanical reconfigurable zoom metalenses","authors":"F. Yang, Hung-I Lin, M. Shalaginov, Katherine Stoll, S. An, C. Rivero‐Baleine, M. Kang, A. Agarwal, K. Richardson, Hualiang Zhang, Juejun Hu, T. Gu","doi":"10.1117/12.2634252","DOIUrl":"https://doi.org/10.1117/12.2634252","url":null,"abstract":"Zoom lenses with adjustable focal lengths and magnification ratios are an crucial part for many optical imaging systems. Conventional zoom lenses comprise multiple refractive optics. Optical zoom is achieved with translational motion of multiple lens elements, which inevitably increases module size, cost, and complexity. Here, we present a zoom lens design based on multi-functional optical metasurfaces. It achieves large zoom ratios with diffraction-limited quality and minimal distortion. Also, it requires no mechanical moving parts. We demonstrate the concept with two embodiments, one in the visible with polarization-multiplexing, and the other in the mid-infrared with phase change materials. Both of them achieve 10x parfocal zoom consistent with the design.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87495908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Richard Feynman’s method of path integrals is based on the fundamental assumption that a system starting at a point 𝐴𝐴 and arriving at a point 𝐵𝐵 takes all possible paths from 𝐴𝐴 to 𝐵𝐵, with each path contributing its own (complex) probability amplitude. The sum of the amplitudes over all these paths then yields the overall probability amplitude that the system starting at 𝐴𝐴 would end up at 𝐵𝐵. We apply Feynman’s method to several optical systems of practical interest and discuss the nuances of the method as well as instances where the predicted outcomes agree or disagree with those of classical optical theory. Examples include the properties of beam-splitters, passage of single photons through Mach-Zehnder and Sagnac interferometers, electric and magnetic dipole scattering, reciprocity, time-reversal symmetry, the optical theorem, the Ewald-Oseen extinction theorem, far field diffraction, and the two-photon interference phenomenon known as the Hong-Ou-Mandel effect.
Richard Feynman的路径积分方法是基于这样一个基本假设:一个系统从一个点出发，到达一个点，采用所有可能的路径，从一个点到一个点，每个路径都有自己的(复杂的)概率幅度。所有这些路径上的振幅之和，然后产生系统从变量变量开始最终到达变量变量的总体概率振幅。我们将费曼方法应用于几个实际感兴趣的光学系统，并讨论了该方法的细微差别以及预测结果与经典光学理论一致或不一致的实例。例子包括分束器的性质，单光子通过马赫-曾达和萨格纳克干涉仪，电和磁偶极子散射，互易性，时间反演对称性，光学定理，Ewald-Oseen消光定理，远场衍射，以及被称为洪瓯-曼德尔效应的双光子干涉现象。
{"title":"Insights into the behavior of certain optical systems gleaned from Feynman's approach to quantum electrodynamics","authors":"M. Mansuripur","doi":"10.1117/12.2632902","DOIUrl":"https://doi.org/10.1117/12.2632902","url":null,"abstract":"Richard Feynman’s method of path integrals is based on the fundamental assumption that a system starting at a point 𝐴𝐴 and arriving at a point 𝐵𝐵 takes all possible paths from 𝐴𝐴 to 𝐵𝐵, with each path contributing its own (complex) probability amplitude. The sum of the amplitudes over all these paths then yields the overall probability amplitude that the system starting at 𝐴𝐴 would end up at 𝐵𝐵. We apply Feynman’s method to several optical systems of practical interest and discuss the nuances of the method as well as instances where the predicted outcomes agree or disagree with those of classical optical theory. Examples include the properties of beam-splitters, passage of single photons through Mach-Zehnder and Sagnac interferometers, electric and magnetic dipole scattering, reciprocity, time-reversal symmetry, the optical theorem, the Ewald-Oseen extinction theorem, far field diffraction, and the two-photon interference phenomenon known as the Hong-Ou-Mandel effect.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87990257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Meyer-Baese, Kerstin Juetten, Uwe Meyer-Baese, A. Stadlbauer, T. Kinfe, Chuh-Hyoun Na
Diffuse infiltrative glioma are considered as a systemic brain disorder and produce alterations on cerebral functional and structural integrity beyond the tumor location. These alterations are the result of the dynamic interplay between large-scale neural circuits. Describing the nature of these interactions has been a challenging task yet important for glioma disease evolution. Modern dynamic graph network theory techniques and control theory applied to these structural and functional networks opens a new research avenue for understanding the dynamical properties and differences between healthy controls and glioma patients. It has been shown that controllability is relevant for providing the mechanistic explanation of how the brain navigates between cognitive states. We believe that it is also relevant for describing the connectomic alterations in glioma and the differences among subtypes and healthy controls. The nodes that are needed to control these networks and influence them to any state are called driver nodes. We determined the driver nodes of the Default-Mode Network (DMN) for resting-state functional connectivity (FC) and diffusion-MRI-based structural connectivity (SC) (comprising edge-weight (EW) and fractional anisotropy (FA)) networks in isodehydrogenase mutated (IDHmut) and wildtype (IDHwt) patients and healthy controls. Our results show that healthy controls have a better controllability for both FC and SC, and that structural connectomic dynamical aberrations are more pronounced in glioma patients than functional connectomic alterations.
{"title":"Dynamical graph networks may aid in phenotyping prognostically different brain tumor types","authors":"A. Meyer-Baese, Kerstin Juetten, Uwe Meyer-Baese, A. Stadlbauer, T. Kinfe, Chuh-Hyoun Na","doi":"10.1117/12.2645973","DOIUrl":"https://doi.org/10.1117/12.2645973","url":null,"abstract":"Diffuse infiltrative glioma are considered as a systemic brain disorder and produce alterations on cerebral functional and structural integrity beyond the tumor location. These alterations are the result of the dynamic interplay between large-scale neural circuits. Describing the nature of these interactions has been a challenging task yet important for glioma disease evolution. Modern dynamic graph network theory techniques and control theory applied to these structural and functional networks opens a new research avenue for understanding the dynamical properties and differences between healthy controls and glioma patients. It has been shown that controllability is relevant for providing the mechanistic explanation of how the brain navigates between cognitive states. We believe that it is also relevant for describing the connectomic alterations in glioma and the differences among subtypes and healthy controls. The nodes that are needed to control these networks and influence them to any state are called driver nodes. We determined the driver nodes of the Default-Mode Network (DMN) for resting-state functional connectivity (FC) and diffusion-MRI-based structural connectivity (SC) (comprising edge-weight (EW) and fractional anisotropy (FA)) networks in isodehydrogenase mutated (IDHmut) and wildtype (IDHwt) patients and healthy controls. Our results show that healthy controls have a better controllability for both FC and SC, and that structural connectomic dynamical aberrations are more pronounced in glioma patients than functional connectomic alterations.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80579473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Amita Rawat, Anthony M. Chiu, K. Choi, Patrick Oduor, A. Dutta, M. Islam
We present a multi-quantum well (MQW)-based photodetectors design method for a 1-3 μm wavelength selectivity range using the finite difference time domain (FDTD) Lumerical platform. We demonstrate absorption coefficient and power absorption profile modulation in an III-V-based type-II MQW stack embedded with photon-trapping (PT) surface structures. We present an MQW-based photodetectors design space by varying the MQW stacking period, and the well and the barrier dimensions from 100-200 and 5-10 nm respectively. We show that the power absorption in the MQW increases for a fixed wavelength sensitivity range. However, the well and the barrier dimension variation facilitate the wavelength sensitivity range modulation. The upper bound of 3 μm on the wavelength-selectivity is achieved by tuning the well/barrier widths. We further proposed a modified device structure to cap the lower wavelength optical signal and cap them at 1 μm. We also show a tremendous increase in power absorption by introducing photon-trapping holes into the MQW structure. Finally, we extract the effective absorption coefficient of the MQW using the power absorption profile generated in the FDTD framework to show the desired wavelength selectivity. Finally, we utilize the extracted absorption coefficient to perform a COMSOL-based simulation to show a 31% enhancement in quantum efficiency of the MQW detector with the introduction of photon-trapping holes.
{"title":"Near-infrared sensors for high efficiency and high-temperature operation enabled by ultra-thin type-II quantum wells and photon-trapping structures","authors":"Amita Rawat, Anthony M. Chiu, K. Choi, Patrick Oduor, A. Dutta, M. Islam","doi":"10.1117/12.2637151","DOIUrl":"https://doi.org/10.1117/12.2637151","url":null,"abstract":"We present a multi-quantum well (MQW)-based photodetectors design method for a 1-3 μm wavelength selectivity range using the finite difference time domain (FDTD) Lumerical platform. We demonstrate absorption coefficient and power absorption profile modulation in an III-V-based type-II MQW stack embedded with photon-trapping (PT) surface structures. We present an MQW-based photodetectors design space by varying the MQW stacking period, and the well and the barrier dimensions from 100-200 and 5-10 nm respectively. We show that the power absorption in the MQW increases for a fixed wavelength sensitivity range. However, the well and the barrier dimension variation facilitate the wavelength sensitivity range modulation. The upper bound of 3 μm on the wavelength-selectivity is achieved by tuning the well/barrier widths. We further proposed a modified device structure to cap the lower wavelength optical signal and cap them at 1 μm. We also show a tremendous increase in power absorption by introducing photon-trapping holes into the MQW structure. Finally, we extract the effective absorption coefficient of the MQW using the power absorption profile generated in the FDTD framework to show the desired wavelength selectivity. Finally, we utilize the extracted absorption coefficient to perform a COMSOL-based simulation to show a 31% enhancement in quantum efficiency of the MQW detector with the introduction of photon-trapping holes.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89359884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Bukosky, Nathan M. Anthony, Evan M. Bursch, S. Dev, M. Allen, Jeffery Allen
While two-dimensional (2D) structural photonic materials have led to many new innovations in the field of optics, the preferential alignment and assembly of colloidal particle arrays over large areas remains a challenge. Here, we develop a theoretical model based on the constructal law in order to describe this particle assembly behavior. The constructal model was then used to predict and tune the resulting particle alignment with and without the presence of an external driving force. Ultimately, this model provides a generalized framework that could be expanded upon to predict the self/directed-assembly of colloidal particles in a range of dynamically tunable and reconfigurable systems.
{"title":"Modeling of directed particle assembly in two-dimensional structures based on constructal law","authors":"S. Bukosky, Nathan M. Anthony, Evan M. Bursch, S. Dev, M. Allen, Jeffery Allen","doi":"10.1117/12.2633112","DOIUrl":"https://doi.org/10.1117/12.2633112","url":null,"abstract":"While two-dimensional (2D) structural photonic materials have led to many new innovations in the field of optics, the preferential alignment and assembly of colloidal particle arrays over large areas remains a challenge. Here, we develop a theoretical model based on the constructal law in order to describe this particle assembly behavior. The constructal model was then used to predict and tune the resulting particle alignment with and without the presence of an external driving force. Ultimately, this model provides a generalized framework that could be expanded upon to predict the self/directed-assembly of colloidal particles in a range of dynamically tunable and reconfigurable systems.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76930572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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