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Conference on current developments in Lens design and optical engineering Xiii

作者： Abgaryan, Artush A. Levi, Eli AISC Inc Hauppauge NY 11788 USA

ISBN: (纸本)9780819492036

For E-beam transmission and transforming we developed an electrostatic focusing device with extraordinary demagnification and abilities for 100% transmission of an electron beam with uniform distribution of current density. This experimental electrostatic focusing system consists of two sections;the first is field formation and second is field free -for measurement space(1). The purpose of this article is to present the experimental results from our electro-optical system. The measurement instrument used in the laboratory set up is an adjustable scanning system, which includes a faraday cup with a 14um diameter tungsten wire, for measuring different cross sections. The measurement of the crossover point is based on a combination of theoretical and experimental processes. The theoretical uses calculations from the " CPO"(2) program and the experimental measures different cross sections which are much larger than the diameter of the tungsten wire. Theoretically, from trajectory calculations, the crossover point is approximately 0.446 mu m. This estimation is obtained by drawing an isosceles triangle from the experimental results and comparing it to another isosceles triangle created from the theoretically calculated trajectories. Both triangles together have a geometrically proportional ratio and differ by about one percent or less. The design of the electrostatic focusing system is achieved utilizing the CGMR (Cone and Golden Mean Ratio) approach (1, 3 and 4). This system is suitable for use in X-ray tubes(5), e-beam lithography, SEM, high speed photonic technology, and also for any EOS.

关键词： Electro-optical systems CRT EBL SEM X-Ray tube electro-vacuum devices

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Investigation of the optical and Structural Properties of WO₃ Thin Films with Different Sputtering Power Supplies

Investigation of the Optical and Structural Properties of WO...

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Conference on current developments in Lens design and optical engineering Xiii

作者： Chen, Hsi-Chao Jan, Der-Jun Chen, Chien-Han Huang, Kuo-Ting Luo, Yu-Siang Chen, Jia-Min Natl Yunlin Univ Sci & Technol Grad Sch Optoelect Yunlin 64002 Taiwan

ISBN: (纸本)9780819492036

The purpose of this research was to investigate the optical and structural properties of tungsten oxide (WO3) thin films deposited with three different sputtering power supplies: direct current (DC), DC pulse and radio frequency (RF). These WO3 thin films were deposited on ITO glass and silicon substrate with different gas ratios of oxygen and argon (O-2/Ar ratio). WO3 thin film is the role of the electrochromic window was resulted from the advantages of large variation in optical density, high response efficiency, no toxicity and low cost. The experimental results showed that optical intensity increased with the increasing of O-2/Ar ratio and all films have the 950cm(-1) peak which the bonding of W+6=O in Raman spectra. Hence, the O-2/Ar ratio was changed from 0.4 to 0.8 to study the ability of coloring and bleaching for the three different power supplies. Anyways, the WO3 thin films had the best electrochromic property at the O-2/Ar ratio of 0.7, 0.6 and 0.6 for DC, DC pulse, and RF, respectively. The transmittances could be over 75% for all films at as-deposited and the deposition rates were between 0.8 and 0.1 angstrom s(-1). Simultaneously, the transmittance variations (Delta T) were 51%, 57% and 53% for DC, DC pulse, and RF power sources at wavelength of 550 nm, respectively. The coloration ability of WO3 thin film deposition with power supply of DC pulse was better than that of the DC and RF.

关键词： Tungsten oxide (WO3) direct current (DC) magnetron sputtering pulsed DC sputtering radio frequency (RF) sputtering Raman spectra

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Organic solid-state integrated amplifiers and lasers

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LASER & PHOTONICS REVIEWS 2012年第4期6卷 419-462页

作者： Grivas, Christos Pollnau, Markus Univ Twente MESA Inst Nanotechnol Integrated Opt Microsyst IOMS NL-7500 AE Enschede Netherlands

Solid-state organic amplifiers and lasers are attractive for hybrid integration due to their compatibility with different material platforms, straightforward processing, and possibility to optimize easily their optical and electronic properties by molecular engineering. Advances in the gain medium design and synthesis in combination with new resonator architectures led to tremendous improvements in temporal and spectral properties, lifetime stability, gains produced and operating threshold powers, which triggered interest in their use for a broad range of integrated photonic applications. In this contribution, the current state-of-the-art in the field of organic solid-state amplifiers and lasers is reviewed from the aspects of fabrication technology, gain materials, and device performance. Furthermore, examples of the progress of this technology from a laboratory curiosity to one that demonstrates practical integrated photonic applications are highlighted. An outlook is also provided on research areas and applications that are likely to shape further developments of this technology. (Figure reprinted from [296], (C) 2000, with permission from Elsevier.)

关键词： Integrated optics polymers and organics laser applications resonators cavities amplifiers arrays, and rings semiconductor lasers laser diodes doped-insulator lasers and other solid state lasers optical waveguides fabrication techniques lithography pattern transfer

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design and fabrication of the near-ultraviolet birefringent Solc filter for the NASA IRIS solar physics mission

Design and fabrication of the near-ultraviolet birefringent ...

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Conference on current developments in Lens design and optical engineering Xiii

作者： Berger, Thomas Mudge, Jason Holmes, Buck Searcy, Paul Wuelser, Jean-Pierre Lemen, James Title, Alan Adv Technol Ctr Palo Alto CA 94304 USA

ISBN: (纸本)9780819492036

The NASA Interface Region Imaging Spectrograph (IRIS) mission is a Small Explorer (SMEX) satellite mission designed to study plasma dynamics in the "interface region" between the Sun's chromosphere and corona with high spatial, spectral, and temporal resolution. The primary instrument is a dual Czerny-Turner spectrograph fed by a 20-cm Cassegrain telescope measuring near-and far-ultraviolet (NUV, FUV) spectral lines in the ranges 133-141 nm and 278-283 nm. To determine the position of the slit on the solar disk, a slit-jaw imaging system is used. The NUV slit-jaw imaging system produces high spatial resolution images at two positions in the Mg II 280 nm spectral line complex using a birefringent Solc filter with two wide-band interference pre-filters for spectral order selection. The Solc filter produces a 0.36 nm full-width at half-maximum (FWHM) filter profile with low sidelobes and a peak transmission of 15% at 279.6 nm. The filter consists of two "wire grid'' polarizers surrounding 8 quartz waveplates configured in a modified Solc "fan" rotational pattern. The elements are optically coupled using DC200 silicon-based grease. The NUV Solc filter is sealed in a windowed cell to prevent silicon contamination of the FUV channel. The design of the sealed cell and assembly of the filter into the cell were among the most challenging optomechanical aspects of the IRIS spectrograph system.

关键词： Optics imaging birefringent filter near-ultraviolet far-ultraviolet satellite systems solar spectrum

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Topical developments of Nanoporous Membrane Filters for Ultrafine Noble Metal Nanoparticles

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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY 2012年第33期2012卷 5439-5450页

作者： El-Safty, Sherif A. Nguyen Duc Hoa Shenashen, Mohamed A. Natl Inst Mat Sci Tsukuba Ibaraki 3050047 Japan Waseda Univ Grad Sch Adv Sci & Engn Shinjuku Ku Tokyo 1698555 Japan

Physicists have predicted and confirmed that metal nanoparticles (NPs) with a diameter between 1 and 10 nm can display electronic structures that reflect the electronic band structure of the NPs and can exhibit extraordinary optical properties. These physicists have focused on developing silica nanotube (NT) membranes for the size-cut-off sieving of noble metal NPs and have proposed a design for the potential application of separated ultrafine NPs, for example in cancer diagnosis and treatment. In our current studies, we have been aiming to control the functionality of the mesofilter design for size-exclusion-cut-off separation. We have focused on successful and current designs for the development of silica (NT) membranes as promising filter candidates for the size-exclusive separation of ultrafine noble metal NPs. The schematic design of nanofilters is also highlighted in relation to engineering dense silica NTs into anodic alumina membrane (AAM) nanochannels. The multifunctional surface coating of AAM pore channels with organic coupling agents facilitates the production of extremely robust membrane sequences without air gaps between the NTs. This practical nanofilter design is capable of producing controlled homogeneous ultrafine noble metal NPs with preferred spherical morphology. Advancements in controlling the simple, scalable fabrication processes of ultrafine noble metal NPs are significant for designed applications in biotechnology, especially for in vivo diagnosis and treatment of cancer, because of their superior surface-to-volume ratio and smaller size (4.5 nm), which is less than the limiting hydrodynamic diameter (5.5 nm) for effective renal clearance from the human body.

关键词： Noble metals Nanoparticles Silica Nanotubes Membranes Nano-filtration

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InGaAs focal plane array developments at iii-V Lab

InGaAs focal plane array developments at III-V Lab

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38th Conference on Infrared Technology and Applications

作者： Rouvié, Anne Reverchon, Jean-Luc Huet, Odile Djedidi, Anis Robo, Jean-Alexandre Truffer, Jean-Patrick Bria, Toufiq Pires, Mauricio Decobert, Jean Costard, Eric III-VLab 1 avenue Augustin Fresnel 91747 Palaiseau France

ISBN: (纸本)9780819490315

SWIR detection band benefits from natural (sun, night glow, thermal radiation) or artificial (eye safe lasers) photons sources combined to low atmospheric absorption and specific contrast compared to visible wavelengths. It gives the opportunity to address a large spectrum of applications such as defense and security (night vision, active imaging), space (earth observation), transport (automotive safety) or industry (non destructive process control). InGaAs material appears as a good candidate to satisfy SWIR detection needs. The lattice matching with InP constitutes a double advantage to this material: attractive production capacity and uncooled operation thanks to low dark current level induced by high quality material. For few years, iii-VLab has been studying InGaAs imagery, gathering expertise in InGaAs material growth and imaging technology respectively from Alcatel-Lucent and Thales, its two mother companies. This work has lead to put quickly on the market a 320x256 InGaAs module, exhibiting high performances in terms of dark current, uniformity and quantum efficiency. In this paper, we present the last developments achieved in our laboratory, mainly focused on increasing the pixels number to VGA format associated to pixel pitch decrease (15μm) and broadening detection spectrum toward visible wavelengths. Depending on targeted applications, different Read Out Integrated Circuits (ROIC) have been used. Low noise ROIC have been developed by CEA LETI to fit the requirements of low light level imaging whereas logarithmic ROIC designed by NIT allows high dynamic imaging adapted for automotive safety. © 2012 SPIE.

关键词： Indium phosphide

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THz lasing in InAs/GaSb broken-gap heterostructure devices and quantum-dot pillar arrays

THz lasing in InAs/GaSb broken-gap heterostructure devices a...

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Terahertz Technology and Applications V

作者： Woolard, Dwight Zhang, Weidong U.S. Army Research Office Research Triangle Park NC 27709 United States ECE Department North Carolina State University NC 27695 United States

ISBN: (纸本)9780819489043

A novel approach for the generation of THz radiation that utilizes "interband" transitions and tunneling processes occurring simultaneously within double-barrier (DB) GaSb/InAs/GaSb broken-gap (BG) resonant-tunneling-diodes (RTDs) is discussed. This paper focuses on the architectural and cavity designs for realizing TE polarized emission from single DB-BG-RTD devices and quantum-dot pillar arrays. design techniques useful for mitigating CB drive current (& the associated thermal heating) while at the same time optimizing output power and power efficiency are discussed. © 2012 Copyright Society of Photo-optical Instrumentation Engineers (SPIE).

关键词： iii-V semiconductors

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A Method of Stabilizing Semiconductor Laser Power

A Method of Stabilizing Semiconductor Laser Power

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3rd International Conference on Mechanical and Electronics engineering (ICMEE 2011)

作者： Yuan, Qiping Zheng, Tianmei Tong, Zhengrong Yang, Xiufeng Cao, Ye Tianjin Univ Technol Sch Elect Informat Engn Tianjin 300384 Peoples R China Tianjin Univ Technol Sch Engn & Commun Sci Tianjin 300384 Peoples R China

ISBN: (纸本)9783037852866

For the influence of the temperature and current, the power of semiconductor laser fluctuates constantly. So this paper comes up with a new method to solve this problem. The design of peripheral circuit contains two parts: temperature control and power control. The system of temperature control uses special laser temperature control chip, which realizes the accuracy of 0.01 degrees C. The system of power control adopts hardware PI control, over-current protection, over-voltage protection, and temperature protection. Temperature compensation is added to the circuit, which realizes the accuracy of 0.01mW.

关键词： Semiconductor laser optical power Proportion integration (PI)

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Gain-assisted hybrid silicon microring electro-absorption modulators

Gain-assisted hybrid silicon microring electro-absorption mo...

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2012 IEEE 9th International Conference on Group IV Photonics, GFP 2012

作者： Srinivasan, Sudharsanan Liang, Di Fiorentino, Marco Beausoleil, Raymond G. Bowers, John E. Electrical and Computer Engineering Dept. University of California Santa Barbara CA United States HP Labs. Palo Alto CA United States

ISBN: (纸本)9781457708268

Energy consumption and device footprint are major limiting factors in scaling current optical interconnect architectures to reach multi-terabit per second data transmission [1]. Hybrid integration of iii-V on Si using a low-temperature O2 plasma-assisted wafer bonding technique [2] is an attractive platform for integrating active elements on Si in a low optical loss and high density manner. Further scaling on individual devices could enable hybrid photonic integrated circuits with complex functionality and low power consumption. A microring resonator is widely regarded as an ideal structure for very compact passive and active devices, e.g., recently demonstrated hybrid Si microring lasers [3]. Although microring structures are wavelength sensitive, they have several advantages viz. small size, resonance-enhanced efficiency and no intrinsic reflections. We propose a novel microring modulator design by incorporating a gain and a loss section in the same microring cavity. Separately biasing the two sections best uses the properties of a microring resonator. We compare this design with two other techniques that were previously employed on iii-V-based electro-absorption (EA) microring modulators [4-5]. We also show the promise of the design in achieving high efficiency modulation with respect to some state of the art Si ring modulator results. © 2012 IEEE.

关键词： Temperature

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current developments in Lens design and optical engineering XII;and Advances in Thin Film Coatings VII

Current Developments in Lens Design and Optical Engineering ...

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current developments in Lens design and optical engineering XII;and Advances in Thin Film Coatings VII

ISBN: (纸本)9780819487384

The proceedings contain 18 papers. The topics discussed include: linear systems formulation of image analysis in the presence of both aberrations and surface scatter;transmission losses in infrared anti-reflection coatings due to water absorption;design of a free-form lens system for short distance projection;progress in the SMS design method for imaging optics;distributed wavefront coding for wide angle imaging system;progressive addition lens design by optimizing NURBS surface;testing and design of a low-cost large scale solar simulator;effects of substrate heating and vacuum annealing on optical and electrical properties of alumina-doped ZnO films deposited by DC magnetron sputtering;and the research of relationships between residual stress and columnar angles in oblique deposition of magnesium fluoride thin films.

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