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Anodic fluoride passivation of InAs/GaSb type ii superlattice infrared detector

Anodic fluoride passivation of InAs/GaSb type II superlattic...

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Annual Conference of the Chinese-Society-for-optical-engineering on Applied Optics and Photonics, China (AOPC)

作者： Zhang, Lixue Cao, Xiancun Yao, Guansheng Zhang, Liang Si, Junjie Sun, Weiguo Luoyang Photoelect Technol Dev Ctr Luoyang 471009 Peoples R China

ISBN: (纸本)9781628419016

One of the major challenges of InAs/GaSb superlattice devices arises owing to the large number of surface states generated during fabrication processes. Surface passivation and subsequent capping of the surfaces are essential for any practical applicability of this material system. In this paper, we passivated InAs/GaSb superlattice infrared detectors proposed anodic fluoride passivation method. Short and mid wavelength InAs/GaSb superlattice infrared materials were grown by Molecular Beam Epitaxy (MBE) on GaSb (100) substrates. A GaSb buffer layer was grown for optimized superlattice growth condition, which can decrease the occurrence of defects with similar pyramidal structure. The result of auger electron spectroscopy (AES) surface scans after anodic fluoride passivation confirms that anodic fluoride passivation treatment did affect. The leakage current as a function of bias voltage (I-V) for InAs/GaSb superlattice infrared detectors has been examined at 77K. Compared with the unpassivated approach, this passivation methods decrease the dark current by approximately five orders of magnitude.

关键词： InAs/GaSb superlattice Infrared detection Anodic fluoride

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Type-ii InAs/GaSb Superlattices Infrared Photodetector Optimization and Gated Photodetector Array Realization

Type-II InAs/GaSb Superlattices Infrared Photodetector Optim...

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作者： Chen, Guanxi Andy Northwestern University

学位级别：Ph.D.

The detection of infrared radiation, which is in the window that human eyes can not see, requires special detector. It is very important for the military, civilian safety, gas detection, medicine, astronomy, and other applications. The commercially available infrared detectors are bulk InSb photodetectors, Mercury Cadmium Telluride (MCT) photodetectors, and quantum well infrared photoconductors (QWIP). All of these photodetectors operate at cryogenic temperature, which require additional coolers to lower the temperature to 77K. The bulk InSb photodetectors have limited cut-off wavelength around 7 micron at 77K so that it is mainly used for the mid-wavelength infrared (MWIR) detection. For the long-wavelength infrared (LWIR) detection, the MCT photodetector is the primary one but it is limited by the uniformity in large area growth. The primary problem QWIPs are facing is low quantum efficiency. Because of all these limitations, an alternative material system, which has the flexibility of tailoring cut-off wavelength, excellent uniformity over large area, potential to operate at higher temperature, high quantum efficiency, and compatibility for multifunction, is required. Since it was proposed by the Nobel laureate Leo Esaki in 1970s, the InAs/GaSb type-ii superlattice (T2SL) has demonstrated its great imaging capability in infrared detection from short-wavelength infrared (SWIR) to very-long-wavelength infrared (VLWIR) regimes, and has been moving towards multi-spectral detection. Because InAs and GaSb are closely lattice matched to each other, they offer great flexibility of designing devices for optical and electrical applications. In recent years, promising performance photodiodes have been achieved because of the development of material quality, the innovative design of device structure, the surface leakage current suppression technique, and its unique band structure engineering capability. Therefore, T2SL has been considered to be a potential alternative of the

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Fabrication and Performance of UV Photodetector Based on Nanostructure ZnO Thin-Film Deposited by Vacuum Coating Technique

Fabrication and Performance of UV Photodetector Based on Nan...

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International Conference on developments in eSystems engineering (DESE)

作者： Ghusoon M. Ali P. Chakrabarti Electrical Engineering Department Al-Mustansiriya University Baghdad IRAQ Department of Electronics Engineering Indian Institute of Technology (BHU) Varanasi INDIA

ISBN: (纸本)9781509018628

The paper reports fabrication, characterization and testing of the thermal stability of Pd/nanostructured ZnO thin-film Schottky diode. The effect of optical power and bias on the performance of fabricated diodes based UV photodetectors has been investigated. ZnO was grown on p-type Si 〈100〉 substrate by vacuum thermal evaporation technique. The surface morphological and the structural properties of the thin-film were studied by scanning electron microscopy and X-ray photoelectron spectroscopy measurements. I-V characteristics of the Schottky barrier UV photodetector were studied and the parameters such as ideality-factor, leakage-current, rectification ratio and barrier-height were extracted from the measured data at room temperature (300K). The study revealed that the performance of the devices has a thermal stability with increasing post metal deposition annealing temperature up to 500°C. For annealing temperatures beyond this temperature the rectification quality of the device degrades drastically. The device exhibited high efficiency and high sensitivity under the reverse bias condition. For forward bias, the UV detection sensitivity decreased proportionally to the bias voltage. At lower level of UV optical power (0.05 to 0.5 mW) the Schottky barrier height and rectification ratio decreased rapidly while at higher level of optical power (5 to 10 mW) these parameters decreased gradually.

关键词： Zinc oxide ii-VI semiconductor materials Annealing Thermal stability Temperature measurement Films Schottky barriers

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Large-area, high-performance functional metrology system for nanophotonic device manufacturing 30

Large-area, high-performance functional metrology system for...

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30th Annual Meeting of the American Society for Precision engineering, ASPE 2015

作者： Gawlik, Brian M. Labrake, Dwayne Sreenivasan, S.V. Mechanical Engineering Department University of Texas at Austin United States NSF NASCENT Engineering Research Center University of Texas at Austin United States Canon Nanotechnologies Inc. AustinTX United States

ISBN: (纸本)9781887706698

As cost-effective scalable nanofabrication techniques become available for nano-scale photonic devices, there is a need for large area metrology techniques that are preferably inline. These techniques are needed not only to establish/qualify manufacturing processes, but also to monitor process reliability for yield management. Here, we discuss the development of such a large area optical metrology system for nanophotonic devices - the nanophotonic functional metrology (NFM) system. The goal of this research is to design the NFM system with the following key features that are relevant in a manufacturing environment: (i) Versatility to allow the measurement of a variety of nanophotonic devices including wire-grid polarizers (WGPs) for LCDs [1-3], metal mesh transparent conductors for flexible displays and touch screens [4-6], plasmonic color filters [7-8], light-trapping structures for photovoltaics [9-11], and various kinds of novel metamaterials and photonic crystal structures [12-15];(ii) Large measurement range to allow measurement over at least 6 decades of light intensity as theoretical contrast ratios for WGPs can extend upwards of 106;(iii) High resolution to detect sub-1% variations in functionality to enable high-resolution comparison between devices and point-to-point characterization across large area devices;(iv) Reconfigurability to enable customized automation of data collection at high speeds without compromising the above features of versatility, large measurement range, and high resolution. A first generation of this NFM system has been fabricated and its current functionality is illustrated for a high-contrast ratio WGP.

关键词： Cost effectiveness

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Chromatic error correction of diffractive optical elements at minimum etch depths 15

Chromatic error correction of diffractive optical elements a...

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Conference on current developments in Lens design and optical engineering XV

作者： Barth, Jochen Guehne, Tobias Airbus Def & Space Landshuter Str 26 D-85716 Unterschleissheim Germany Airbus Def & Space D-81663 Munich Germany

ISBN: (纸本)9781628412192

The integration of diffractive optical elements (DOE) into an optical design opens up new possibilities for applications in sensing and illumination. If the resulting optics is used in a larger spectral range we must correct not only the chromatic error of the conventional, refractive, part of the design but also of the DOE. We present a simple but effective strategy to select substrates which allow the minimum etch depths for the DOEs. The selection depends on both the refractive index and the dispersion.

关键词： Diffractive optics Aberration compensation

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optical design of Low Glare Luminaire Applied for Tunnel Light 15

Optical Design of Low Glare Luminaire Applied for Tunnel Lig...

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Conference on current developments in Lens design and optical engineering XV

作者： Tsai, M. S. Lee, X. H. Lo, Y. C. Sun, C. C. Natl Cent Univ Dept Opt & Photon Chungli 320 Taiwan

ISBN: (纸本)9781628412192

In this study, a low glare and high-efficient tunnel lighting design which consists of a cluster light-emitting diode and a free-form lens is presented. Most of the energy emitted from the proposed luminaire is transmitted onto the surface of the road in front of drivers, and the probability that the energy is emitted directly into drivers' eyes is low. Compared with traditional fluorescent lamps, the proposed luminaire, of which the optical utilization factor, optical efficiency, and uniformity are, respectively, 44%, 92.5%, and 0.72, performs favorably in traffic safety, energy saving, and glare reduction.

关键词： Light-emitting diodes Illumination design Nonimaging optics optical design and fabrication

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Effect of Injection Molding Processing Conditions on optical Properties of Polyetherimide 15

Effect of Injection Molding Processing Conditions on Optical...

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Conference on current developments in Lens design and optical engineering XV

作者： Zhao, Wei Wall, Christopher Maddikeri, Raghavendra May, Andy SABIC Innovat Plast LLC 1 Lexan Lane Mt Vernon IN 47620 USA SABIC Innovat Plast LLC Pittsfield MA 01201 USA

ISBN: (纸本)9781628412192

SABIC's ULTEM (TM) (polyetherimide) resin has been the choice of material for injection moldable micro lenses and lens arrays in optical communication components such as transceivers due to its unique combination of physical, thermal and optical properties including high refractive index, low absorption in near IR range, good dimensional stability and high heat performance. It's known that processing conditions affect properties of final parts. Often the processing conditions are optimized for best mechanical properties, while their effect on optical properties is sidelined. In this study, the effect of injection molding processing conditions on optical properties of polyetherimide resin is discussed.

关键词： Polyetherimide Injection Molding Processing Conditions optical Properties Lens

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Caustic surface of a plane wavefront refracted by a smooth arbitrary surface 15

Caustic surface of a plane wavefront refracted by a smooth a...

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Conference on current developments in Lens design and optical engineering XV

作者： Avendano-Aleja, Maximino Univ Nacl Autonoma Mexico Ctr Ciencias Aplicadas & Desarrollo Tecnol Mexico City 04510 DF Mexico

ISBN: (纸本)9781628412192

We study the formation of caustic produced by smooth arbitrary surfaces considering a plane wavefront propagating parallel to the optical axis and impinging on the refracting surface. We have already seen that the shape of the caustic surface can represent the monochromatic aberrations that we call image errors, furthermore the shape of the caustic can be modified by changing the parameters of the lens in such a way that if the caustic surfaces is vanished the optical system produces a perfect image, on the other hand for a caustic possessing a large area it could be applied to design no-imaging optical systems. The shape of the caustic depends only on the indices of refraction involved in the process of refraction, the refracting surface which is formed by smooth arbitrary plano-convex lens. We provide an analytic equation for the caustic surface after refraction of a plane wave from every rotationally symmetric surface.

关键词： Refraction Aspheric lenses Wavefronts Ray tracing optical design Geometrical optics Monochromatic aberrations Light Radon Wave propagation

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Analysis of double conjugate zoom lens using tunable-focus lenses 15

Analysis of double conjugate zoom lens using tunable-focus l...

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Conference on current developments in Lens design and optical engineering XV

作者： Novak, Jiri Novak, Pavel Miks, Antonin Czech Tech Univ Fac Civil Engn Dept Phys Prague 16629 6 Czech Republic

ISBN: (纸本)9781628412192

The work is focused on an analysis and modeling of paraxial imaging parameters of an optical system with a variable magnification or focal length, which keeps the position of object and image planes and entrance and exit pupil planes fixed. This system does not move its elements during the change of the magnification or the focal length. Such an effect can be achieved using tunable-focus active lenses. The described double conjugate zoom lens with tunable-focus lenses satisfies the requirement that object, image and pupil planes are fixed during the change of magnification or focal length. The system must be composed of at minimum three optical elements. Formulas are derived, which enable to determine focal lengths of individual elements of the optical system in a general case, when an object is situated in a finite or infinite distance from the optical system. Such an optical system can be principally used in the design of riflescopes with a variable magnification. This design of the riflescope has the advantage of the fixed position of its optical components (tunable-focus lenses). Further, the position of the exit pupil does not change and stays fixed in a fixed distance from the eyepiece during the change of magnification.

关键词： zoom lens tunable-focus lenses optical imaging first order optics riflescope

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Afocal viewport optics for underwater imaging 15

Afocal viewport optics for underwater imaging

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Conference on current developments in Lens design and optical engineering XV

作者： Slater, Dan 1352 Dorothea Rd La Habra Hts CA 90631 USA

ISBN: (纸本)9781628412192

A conventional camera can be adapted for underwater use by enclosing it in a sealed waterproof pressure housing with a viewport. The viewport, as an optical interface between water and air needs to consider both the camera and water optical characteristics while also providing a high pressure water seal. Limited hydrospace visibility drives a need for wide angle viewports. Practical optical interfaces between seawater and air vary from simple flat plate windows to complex water contact lenses. This paper first provides a brief overview of the physical and optical properties of the ocean environment along with suitable optical materials. This is followed by a discussion of the characteristics of various afocal underwater viewport types including flat windows, domes and the Ivanoff corrector lens, a derivative of a Galilean wide angle camera adapter. Several new and interesting optical designs derived from the Ivanoff corrector lens are presented including a pair of very compact afocal viewport lenses that are compatible with both in water and in air environments and an afocal underwater hyper-hemispherical fisheye lens.

关键词： Afocal lens design underwater photography water contact lens Ivanoff corrector lens dome port hyperhemispherical fisheye lens

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