Methods for computer design of diffractive optical elements pdf

Three methods of designing diffractive optical elements doe are compared. Proceedings of information technology and nanotechnology itnt2015, ceur workshop proceedings, 2015. Dimensional measurements of diffractive optic structures are used both during and after fabrication of the element. You can implement a wide range of applications with minimal light loss examples of diffractive microoptics can be found in production facilities for laser material processing, in medical laser treatments and diagnostic instruments, in areas such. In practice, diamonds are used for manufacturing diffractive optical elements does such as gratings, kinoforms, radiation focusators and correctors, etc. Such a diffuser provides light with more than two phasor vectors at the zero order. Micro and diffractive optical elements springerlink. Design and simulation methods design and simulation of diffractive optical elements.

Methods for solving thedirect diffractionproblem 19 1. The breadth of methods for computer design of diffractive optical elements covers doe production, beginning from the design techniques and the software, to the fabrication technology, experimental studies, and testing of does, including all major doe application fields and doe types. Modeling, design and fabrication of diffractive optical elements. Pdf in this paper is presented the design, fabrication and characterization of a binary phasecontrast. Computer design of diffractive optics provides an authoritative guide to the principles and applications. Click download or read online button to get methods for computer design of diffractive optical elements book now. Diffractive elements are fabricated by the method of direct laser writing on a photoresist by using a circular laser writing system. The design of diffractive optical elements uses many ideas and concepts from conventional optic designs. Various algorithms have been suggested to optimize such a set of parameters in order to obtain a diffractive element with satisfying optical properties. Diffractive optics as a field has seen a lot of progress in the past. The fundamentals of fabrication techniques such as photolithography and focused ion beam. Methods for computer design of diffractive optical elements.

Using inhouse developed as well as commercially available state of theart software tools and algorithms, appropriate simulation methods paraxial or rigorous electromagnetic are used for optimization of the doe design. Thefinite element methodfor solvingintegral equations 21 references 24 2 diffractive opticaltransformations 25 2. Robust design method for highly efficient beamshaping diffractive. Computeraided design of diffractive optical elements. Iteractive methods for diffractive optical elements. Study of the chromatic properties of harmonic diffractive lens. Recent optical solutions with diffractive optical technology.

The approach for the design and fabrication presented here can be extended forr the realization of the diffractive optical elements with various application. Pseudorandom dot arrays with different sizes were generated to validate the proposed encoding methods. In two dimensions the design of paraxially operating diffractive elements is typically based on a pixeloriented parametrization of the structure of the element. We now consider a number of techniques for both dimensional and optical testing of diffractive optical elements. Continuous profile writing by optical and electron lithography. Request pdf computeraided design of diffractive optical elements a number. Multifocal diffractive lens generating several fixed foci at. Rigorous analysis and design of diffractive optical elements by jianhua jiang a dissertation submitted in partial fulfillment of the requirements for the degree of doctor of philosophy in the optical science and engineering program of the school of graduate studies of the university of alabama in huntsville huntsville, alabama 2000. Diffractive elements are thin phase elements that operate by means of interference and diffraction to produce arbitrary distributions of light or to aid in the design of optical systems. A comparison of the iterative fourier transform method and. Does are being widely applied in such areas as telecommunications, electronics, laser technologies and biomedical engineering. Design and fabrication of diffractive optical elements. On pixeloriented structure parametrization for design of.

Shlomit katz is an optical design engineer at holoor ltd. However a considerable part of it uses computer generated digital simulations and optimization techniques which utilize the up growing power of modern. Sep 16, 2016 diffractive optical elements can be realized as ultrathin plates that offer significantly reduced footprint and weight compared to refractive elements. Diffractive optics involves the manipulation of light using diffractive optical elements does. Pdf design and fabrication of diffractive optical elements. Design and fabrication of diffractive optical elements with matlab. Diffractive optical elements doe 15 are in fact computer generated. Robust design method for highly efficient beamshaping. A computational design framework for efficient, fabrication error. Design and verification of diffractive optical elements for. Differentschemes ofsolving differential equations 19 1.

It is shown that the combination of both methods produces a better solution than the iterative method and is faster than using the evolutionary strategy only. A computational design framework for efficient, fabrication. The theoretical aspects underpinning diffractive optics are initially explored, including the main equations in diffraction theory and diffractive optical transformations. Encoded diffractive optics for fullspectrum computational. Computer design of diffractive optics sciencedirect. Computergenerated stratified diffractive optical elements. Volkov, methods for computer design of diffractive optical elements wiley, 2002. Based on the principles of computer generated holograms, the iterative fourier transform. Various optimal search strategies like direct search methods which. In the past, optical elements were often designed with axisymmetric surface due to limitation on fabrication processes.

Computer design of diffractive optics woodhead publishing. With this method, inverse problems of doe design can be efficiently solved. A broadband diffractive diffuser contains at least three levels, with approximately a phase shift of. Michael morris the institute of optics university of rocherster rochester, new york 14627. Us6118559a broadband diffractive diffuser and associated. Computer design of diffractive optics provides an authoritative guide to the principles and applications of computer designed diffractive optics. Rpc photonics designs and fabricates diffractive elements with both binary and analog phase profiles. Osa comparison of encoding methods for computergenerated. Calculation of diffractive optical elements in geometrical optics approximation. The optical projection using speckles is one of the structured light methods that have been applied to threedimensional 3d range sensors. The iterative fourier transform algorithm ifta is compared to an evolutionary strategy es approach and a combination of both methods. Optical elements are not only limited in refractive lenses, prisms, and mirrors.

The first one is the use of scalar diffraction theory for the purpose of simulating and implementing diffractive optical elements does. This high level monograph for the optics research market explores a large number of novel interactive methods and algorithms for calculating the transmission function of phase diffractive optical elements. Diffractive optics refers to the technology of producing surfacerelief, and computer generated diffractive patterns directly on the optical material by means of fabrication technology in the microelectronics industry, offering a very flexible way of controlling and shaping of phase fronts or bending of rays. Diffractive optics rpc photonics optical components. Factors affecting convergence in the design of diffractive. Katz holds a bachelor of science degree in optical systems engineering. Search the leading research in optics and photonics applied research from spie journals, conference proceedings and presentations, and ebooks.

In this paper is presented the design, fabrication and characterization of a binary phasecontrast transmission diffractive optical element made by wet etching of the glass substrate. Computeraided design of diffractive optical elements request pdf. Diffractive optical elements does shape and split laser beams in an energyefficient manner. Effect of supercomputer parallelization on the simulation time. It is shown that all five produce similar results for a given value of the minimum feature size. Computergenerated stratified diffractive optical elements osa. Methods for computer design of diffractive optical elements is an estimable reference for experts in the aerospace industry, research and development institutes, the automobile industry, as well as students and university professors. Suppose someone goofed and the design is incorrect. Introduction in the optical industry, freeform optical surfaces are now becoming a practical solution for some design and manufacturing problems. Robust design method for highly efficient beamshaping diffractive optical elements using an iterativefouriertransform algorithm with soft operations. This paper investigates the design and fabrication of diffractive optical elements does for generating the light field with uniformly distributed speckles.

The new method combines the optimal decimationinfrequency iterative interlacing technique odifiit with the lohmann coding scheme. They offer a very good precision of the micro optical elements but these methods are expensive and they require specialized equipment. The design of diffractive optical elements uses many ideas and concepts from. Analysis and design of complex diffractive optical elements does with. The donut profile of the vortex design is now used for multispot elements in which two donut profiles can be arranged either next to or one after the other. Five modern encoding methods for diffractive optical elements are compared in terms of diffraction efficiency for an f1 focusing element. Methods for computer design of diffractive optical elements wiley series in lasers and applications, 2002. Fabrication of micro and diffractive optical devices by use. Two existing methods were combined to improve the reconstructed image of a cgh. How is the design in a computer transformed into a physicalcomponent. The main focus was on the optimal design of computer generated holograms cghs. Factors affecting convergence in the design of diffractive optics by iterative vectorspace methods henry stark, yongyi yang, and damla gurkan department of electrical and computer engineering, illinois institute of technology, chicago, illinois 60601. However, before a diffractive optical element can be built, a number of additional questions must be addressed. This site is like a library, use search box in the widget to get ebook that you want.

New optical components such as microlens arrays, holographic lenses, and diffractive elements are also used in various optoelectronic devices, so that optoelectronic devices and their components are smaller, in flat array and feasible integration. Improved focus depth with does the small focus depth of optical elements is particularly problematic in laser applications. She designs diffractive optical elements and laser optical systems and provides technical support for a wide range of products. Iterative methods for diffractive optical elements computation.