Defense, Security, and Sensing最新文献_第2页

Reduction of dark current density by five orders at high bias and enhanced multicolour photo response at low bias for quaternary alloy capped InGaAs/ GaAs QDIPs, when implanted with low-energy light (H-) ions 当注入低能光(H-)离子时，高偏压下InGaAs/ GaAs qdip的暗电流密度降低了5个数量级，并增强了低偏压下的多色光响应

Defense, Security, and Sensing Pub Date : 2013-06-18 DOI: 10.1117/12.2016299

A. Mandal, H. Ghadi, Goma Kumari K. C., A. Basu, N. Subrahmanyam, P. Singh, S. Chakrabarti

引用次数: 0

Nanowire grid polarizers for mid- and long-wavelength infrared applications 用于中长波长红外应用的纳米线网格偏振器

Defense, Security, and Sensing Pub Date : 2013-06-18 DOI: 10.1117/12.2016221

M. George, Bin Wang, R. Petrova, Hua Li, J. Bergquist

{"title":"Nanowire grid polarizers for mid- and long-wavelength infrared applications","authors":"M. George, Bin Wang, R. Petrova, Hua Li, J. Bergquist","doi":"10.1117/12.2016221","DOIUrl":"https://doi.org/10.1117/12.2016221","url":null,"abstract":"High contrast wire grid polarizers on silicon suitable for mid-wavelength infrared (MWIR) and long-wavelength infrared (LWIR) applications have been developed using wafer-scale aluminum nanowire patterning capabilities. The 144 nm pitch MWIR polarizer typically transmits better than 95% of the passing polarization state from 3.5-5.5 microns while maintaining a contrast ratio of better than 37dB. Between 7 and 15 microns, the broadband LWIR polarizer typically transmits between 55 and 90% of the passing state and has a contrast ratio better than 40 dB. A narrowband 10.6 micron polarizer shows about 85% transmission in the passing state and a contrast ratio of 45 dB. Transmission and reflection measurements were made using various FTIR spectrometers and compared to RCWA modeling of the wire grid polarizer (WGP) performance on antireflection-coated wafers. Laser Damage Threshold (LDT) testing was performed using a continuous wave CO2 laser for the broadband LWIR product and showed a damage threshold of 110 kW/cm2 in the blocking state and 10 kW/cm2 in the passing state. The MWIR LDT testing used an OPO operating at 4 microns with 7 ns pulses and showed LDT of 650 W/cm2 in the blocking state and better than 14 kW/cm2 in the passing state","PeriodicalId":338283,"journal":{"name":"Defense, Security, and Sensing","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132737837","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}

引用次数: 3

Analysis of propellant combustion with real-time multispectral infrared camera 基于实时多光谱红外摄像机的推进剂燃烧分析

Defense, Security, and Sensing Pub Date : 2013-06-18 DOI: 10.1117/12.2015835

E. Sakat, G. Vincent, S. Rommeluère, C. Eradès, S. Lefebvre, F. Cauty, S. Collin, G. Druart, J. Pelouard, R. Haïdar

引用次数: 1

Broadband enhancement of infrared photodetectors with metamaterial resonators 用超材料谐振器增强红外探测器的宽带性能

Defense, Security, and Sensing Pub Date : 2013-06-18 DOI: 10.1117/12.2018198

J. Montoya, S. Myers, A. Barve, J. Kim, S. Krishna, D. Peters, C. Reinke, J. Wendt

引用次数: 0

16 megapixel 12μm array developments at Selex ES Selex ES的1600万像素12μm阵列开发

Defense, Security, and Sensing Pub Date : 2013-06-18 DOI: 10.1117/12.2015886

P. Thorne, J. Gordon, L. Hipwood, A. Bradford

引用次数: 6

Cryogenic wafer-level MWIR camera: laboratory demonstration 低温晶圆级MWIR相机:实验室演示

Defense, Security, and Sensing Pub Date : 2013-06-18 DOI: 10.1117/12.2016371

G. Druart, F. de la Barrière, M. Chambon, N. Guerineau, G. Lasfargues, M. Fendler

引用次数: 1

Modeling of InAsSb/AlAsSb nBn HOT detector's performance limit InAsSb/AlAsSb nBn热探测器性能极限建模

Defense, Security, and Sensing Pub Date : 2013-06-18 DOI: 10.1117/12.2017721

P. Martyniuk, A. Rogalski

{"title":"Modeling of InAsSb/AlAsSb nBn HOT detector's performance limit","authors":"P. Martyniuk, A. Rogalski","doi":"10.1117/12.2017721","DOIUrl":"https://doi.org/10.1117/12.2017721","url":null,"abstract":"InAsSb ternary alloy is potentially capable of operating at the longest cut-off wavelength (about 9 μm at 77 K) in the entire III-V family. Recently, there has been a considerable progress in development of the InAsSb focal plane arrays. The high operation temperature conditions were successfully achieved with AIIIBV unipolar barrier structures including InAsSb/AlAsSb material system. In this paper, the performance of medium wavelength infrared (MWIR) InAsSb-based nBnnn+ detectors, called also \"bariodes\", is examined theoretically taking into account thermal generation governed by the Auger and radiative mechanisms. In our model, the heterojunction barrier-active region (absorber) is assumed to be decisive as the contributing dark current mechanism limiting detector's performance. Since there is no depletion layer in the active layer of such devices, generation-recombination and trap assisted tunneling mechanisms are suppressed leading to lower dark currents in bariode detectors in comparison to standard diodes. Detailed analysis of the detector’s performance (such as dark current, RA product, and current responsivity) versus bias voltage and operating temperatures are performed pointing out optimal working conditions. The theoretical predictions of bariode parameters are compared with experimental data published in the literature. Finally, the bariode performance is compared with standard p+-on-n InAsSb photodiodes operated at room temperature with the same bandgap wavelength.","PeriodicalId":338283,"journal":{"name":"Defense, Security, and Sensing","volume":"8704 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130128552","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}

引用次数: 13

Enhanced processability of ZrF4-BaF2-LaF3-AlF3-NaF glass in microgravity 微重力条件下ZrF4-BaF2-LaF3-AlF3-NaF玻璃可加工性增强

Defense, Security, and Sensing Pub Date : 2013-06-18 DOI: 10.1117/12.2018308

A. Torres, J. Ganley, A. Maji, D. Tucker, D. Starodubov

{"title":"Enhanced processability of ZrF4-BaF2-LaF3-AlF3-NaF glass in microgravity","authors":"A. Torres, J. Ganley, A. Maji, D. Tucker, D. Starodubov","doi":"10.1117/12.2018308","DOIUrl":"https://doi.org/10.1117/12.2018308","url":null,"abstract":"Fluorozirconate glasses, such as ZBLAN (ZrF4-BaF2-LaF3-AlF3-NaF), have the potential for optical transmission from 0.3 μm in the UV to 7 μm in the IR region. However, crystallites formed during the fiber drawing process prevent this glass from achieving its desired transmission range. The temperature at which the glass can be drawn into a fiber is known as the working range, defined as (Tx - Tg), bounded by the glass transition temperature (Tg) and the crystallization temperature (Tx). In contrast to silica glasses, the working temperature range for ZBLAN glass is extremely narrow. Multiple ZBLAN samples were subject to a heating and quenching test apparatus on the parabolic aircraft, under a controlled 0-g and hyper-g environment and compared with 1-g ground tests. The microgravity duration on board Zero-G Corporation parabolic aircraft is approximately 20 seconds and the hyper-g intervals are approximately 56 seconds. Optical microscopy examination elucidates crystal growth in ZBLAN is suppressed when processed in a microgravity environment. The crystallization temperature, Tx, at which crystals form increased, therefore, significantly broadening the working temperature range for ZBLAN.","PeriodicalId":338283,"journal":{"name":"Defense, Security, and Sensing","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123727766","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}

引用次数: 3

Solid state temperature-dependent NUC (non-uniformity correction) in uncooled LWIR (long-wave infrared) imaging system 非冷却长波红外(LWIR)成像系统中固态温度相关非均匀性校正

Defense, Security, and Sensing Pub Date : 2013-06-18 DOI: 10.1117/12.2015641

Yanpeng Cao, C. Tisse

{"title":"Solid state temperature-dependent NUC (non-uniformity correction) in uncooled LWIR (long-wave infrared) imaging system","authors":"Yanpeng Cao, C. Tisse","doi":"10.1117/12.2015641","DOIUrl":"https://doi.org/10.1117/12.2015641","url":null,"abstract":"In uncooled LWIR microbolometer imaging systems, temperature fluctuations of FPA (Focal Plane Array) as well as lens and mechanical components placed along the optical path result in thermal drift and spatial non-uniformity. These non-idealities generate undesirable FPN (Fixed-Pattern-Noise) that is difficult to remove using traditional, individual shutterless and TEC-less (Thermo-Electric Cooling) techniques. In this paper we introduce a novel single-image based processing approach that marries the benefits of both statistical scene-based and calibration-based NUC algorithms, without relying neither on extra temperature reference nor accurate motion estimation, to compensate the resulting temperature-dependent non-uniformities. Our method includes two subsequent image processing steps. Firstly, an empirical behavioral model is derived by calibrations to characterize the spatio-temporal response of the microbolometric FPA to environmental and scene temperature fluctuations. Secondly, we experimentally establish that the FPN component caused by the optics creates a spatio-temporally continuous, low frequency, low-magnitude variation of the image intensity. We propose to make use of this property and learn a prior on the spatial distribution of natural image gradients to infer the correction function for the entire image. The performance and robustness of the proposed temperature-adaptive NUC method are demonstrated by showing results obtained from a 640×512 pixels uncooled LWIR microbolometer imaging system operating over a broad range of temperature and with rapid environmental temperature changes (i.e. from –5°C to 65°C within 10 minutes).","PeriodicalId":338283,"journal":{"name":"Defense, Security, and Sensing","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114957299","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}

引用次数: 7

New multiband IR imaging optics 新型多波段红外成像光学

Defense, Security, and Sensing Pub Date : 2013-06-18 DOI: 10.1117/12.2016332

S. Bayya, J. Sanghera, Woohong Kim, D. Gibson, E. Fleet, B. Shaw, M. Hunt, I. Aggarwal

{"title":"New multiband IR imaging optics","authors":"S. Bayya, J. Sanghera, Woohong Kim, D. Gibson, E. Fleet, B. Shaw, M. Hunt, I. Aggarwal","doi":"10.1117/12.2016332","DOIUrl":"https://doi.org/10.1117/12.2016332","url":null,"abstract":"We report new multispectral materials that transmit from 0.9 to < 12 µm in wavelength. These materials fill up the glass map for multispectral optics and vary in refractive index from 2.38 to 3.17. They show a large spread in dispersion (Abbe number) and offer some unique solutions for multispectral optics designs. One of the glasses developed is a very good candidate to replace Ge, as it has a combination of excellent properties, including high Abbe number in the LWIR, high index of 3.2, 60% lower dn/dT, and better thermal stability at working temperatures. Our results also provide a wider selection of optical materials to enable simpler achromat designs. For example, we have developed other glasses that have relatively high Abbe number in both the MWIR and LWIR regions, while our MILTRAN ceramic has low Abbe number in both regions. This makes for a very good combination of glasses and MILTRAN ceramic (analogous to crown and flint glasses in the visible) for MWIR + LWIR dual band imaging. We have designed preliminary optics for one such imager with f/2.5, 51 mm focal length and 22 degrees FOV using a spaced doublet of NRL's glass and MILTRAN ceramic. NRL's approach reduces the number of elements, weight, complexity and cost compared with the approach using traditional optics. Another important advantage of using NRL glasses in optics design is their negative or very low positive dn/dT, that makes it easier to athermalize the optical system.","PeriodicalId":338283,"journal":{"name":"Defense, Security, and Sensing","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133408395","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}

引用次数: 8