Diffractive Optics and Micro-Optics最新文献_第9页

Reconfigurable optical interconnects in free-space optical processing modules based on polarization-selective diffractive optical elements 基于偏振选择性衍射光学元件的自由空间光处理模块中的可重构光互连

Diffractive Optics and Micro-Optics Pub Date : 1900-01-01 DOI: 10.1364/domo.1998.dtud.4

H. Thienpont, N. Nieuborg, A. Goulet, A. Kirk, P. Koczyk, P. Heremans, M. Kuijk, C. De Tandt, W. Ranson, R. Vounckx, I. Veretennicoff

引用次数: 0

Numerical Simulation of Binary Lenses by Direct Solution of the Helmholtz Equation 直接解亥姆霍兹方程的二元透镜数值模拟

Diffractive Optics and Micro-Optics Pub Date : 1900-01-01 DOI: 10.1364/domo.1998.dtua.3

G. R. Hadley

{"title":"Numerical Simulation of Binary Lenses by Direct Solution of the Helmholtz Equation","authors":"G. R. Hadley","doi":"10.1364/domo.1998.dtua.3","DOIUrl":"https://doi.org/10.1364/domo.1998.dtua.3","url":null,"abstract":"Binary diffractive optics have become an important class of structures for use in optical interconnects and coupling into fibers1. Such structures have been successfully designed in the past using the techniques of Fourier analysis. These techniques are entirely adequate for near-paraxial optics such as occur with high-F-number lenses. The design of fast (F<1.5) lenses such as those required for coupling light into optical fibers, however, requires the use of more accurate techniques, most of which are based upon modal expansions2,3. In this paper we describe a new finite-difference method for modeling small-feature-size binary optical structures that involves the direct solution of the scalar Helmholtz in the vicinity of the structure, followed (in the case of lenses) by wide-angle beam propagation to predict the size of the focal spot. In this approach, the structure is described entirely by by its resulting dielectric function, allowing the treatment of aperiodic binary structures of arbitrary complexity. All reflections together with effects due to sub-wavelength feature sizes are automatically included. Polarization effects are treated approximately owing to the use of semivectorial boundary conditions at all dielectric interfaces. This technique has been shown previously4 to correctly model the behavior of first-and second-order diffraction gratings etched into waveguides. (The present method differs slightly from that described in reference 4 in that the solution method is direct matrix inversion instead of the iterative method described therein.) It involves no expansions or simplifying assumptions (aside from vectorial considerations) and is quite fast, requiring only a few minutes of workstation runtime.","PeriodicalId":301804,"journal":{"name":"Diffractive Optics and Micro-Optics","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129642391","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: 0

Reactive ion etching: a versatile fabrication technique for micro-optical elements 反应离子蚀刻:微光学元件的通用制造技术

Diffractive Optics and Micro-Optics Pub Date : 1900-01-01 DOI: 10.1364/domo.1998.dtud.21

M. Ferstl

引用次数: 1

Diode laser illuminated automotive brake lamp using a linear fanout diffractive optical element 采用线性扇出衍射光学元件的二极管激光照明汽车刹车灯

Diffractive Optics and Micro-Optics Pub Date : 1900-01-01 DOI: 10.1364/domo.1998.dwa.5

J. Remillard, M. A. Marinelli, T. Fohl, D. A. O'neil

引用次数: 3

Three Dimensional Vector-based Analysis of Subwavelength Diffractive Optical Elements using the Finite-Difference-Time-Domain (FDTD) Method 基于三维矢量的亚波长衍射光学元件时域有限差分(FDTD)分析

Diffractive Optics and Micro-Optics Pub Date : 1900-01-01 DOI: 10.1364/domo.1998.dtub.4

M. Mirotznik, J. Mait, D. Prather, W. Beck

引用次数: 0

Array Generator Design for an Optical Analog-to-Digital Converter 光学模数转换器的阵列发生器设计

Diffractive Optics and Micro-Optics Pub Date : 1900-01-01 DOI: 10.1364/domo.1996.jtub.5

J. Mait, B. Shoop

{"title":"Array Generator Design for an Optical Analog-to-Digital Converter","authors":"J. Mait, B. Shoop","doi":"10.1364/domo.1996.jtub.5","DOIUrl":"https://doi.org/10.1364/domo.1996.jtub.5","url":null,"abstract":"Within the context of image processing, digital image halftoning is an important class of analog-to-digital (A/D) conversion. Halftoning can be thought of as an image compression technique whereby a continuous-tone, gray-scale image is printed or displayed using only binary-valued pixels. One method to achieve digital halftoning is error diffusion, wherein the error associated with a nonlinear quantization process is diffused within a local region. One of us (BLS) has developed a neural network architecture based on the mathematical foundation of the error diffusion algorithm that is called an error diffusion neural network [1]. The error diffusion neural network computes the halftoned image asymptotically faster than a conventional Hopfield-type neural network, provides full-rank connectivity across the entire image (other error diffusion techniques provide only local error diffusion), and, because of its parallel implementation, does not generate any artifacts commonly associated with sequential halftoning. Figure 1 is a representation of a smart-pixel-based architecture for an optical implementation of the error diffusion algorithm. The functionality required of the error diffusion neural network is implemented using gallium arsenide (GaAs) and aluminum gallium arsenide (AlGaAs) multiple quantum well modulators. The two-dimensional spatial distribution and intensity weighting required of the error diffusion filter is accomplished using a diffractive array generator. We report here on the design of the array generator.","PeriodicalId":301804,"journal":{"name":"Diffractive Optics and Micro-Optics","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131779026","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: 0

Realization of Multilayer Diffractive Components Experimental Methods of Characterization 多层衍射元件实验表征方法的实现

Diffractive Optics and Micro-Optics Pub Date : 1900-01-01 DOI: 10.1364/domo.1996.dwc.3

H. Giovannini, H. Akhouayri, C. Amra

{"title":"Realization of Multilayer Diffractive Components Experimental Methods of Characterization","authors":"H. Giovannini, H. Akhouayri, C. Amra","doi":"10.1364/domo.1996.dwc.3","DOIUrl":"https://doi.org/10.1364/domo.1996.dwc.3","url":null,"abstract":"It has been shown that multilayer coatings permit to modify the optical properties of diffraction gratings[1], which increases the fields of application of gratings, especially in microoptics domain. For example, the efficiency of a grating for s or p polarization can be varied by depositing an optical coating on the diffracting surface[2]. Several techniques can be used to realize such components. One can mention the evaporation techniques (Electron Beam Deposition, Ion Assisted Deposition, Ion Plating) already used for thin film applications. These techniques have been used in our laboratory to realize various diffractive components. The optical properties (efficiency of diffracted orders and phase difference of the scattered field between s and p polarizations) of such components, have been measured by using two devices: one based on a goniometric ellipsometer[3], the other based on a recently developed grating interferometer[4]. The results obtained with these two techniques have been analyzed and compared to the results given by a numerical simulation based on a rigourous method, and the absorption has been measured by using a photothermal technique[5].","PeriodicalId":301804,"journal":{"name":"Diffractive Optics and Micro-Optics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131918176","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: 0

Polarization selective diffractive optical elements and applications 偏振选择衍射光学元件及其应用

Diffractive Optics and Micro-Optics Pub Date : 1900-01-01 DOI: 10.1364/domo.1998.dmd.1a

Y. Fainman, F. Xu, R. Tyan, D. Marom, P. Shames, P. Sun, J. Ford, A. Scherer, A. Krishnamoorthy

引用次数: 0

Fabrication of micro-optics and diffractive lenses using analogue methods 用模拟方法制造微光学和衍射透镜

Diffractive Optics and Micro-Optics Pub Date : 1900-01-01 DOI: 10.1364/domo.1996.jmc.1

M. Hutley

引用次数: 0

Interferometric Tests for Micro-Optics 微光学干涉测试

Diffractive Optics and Micro-Optics Pub Date : 1900-01-01 DOI: 10.1364/domo.1996.dwc.1

N. Lindlein, J. Schwider

引用次数: 0