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Co-extruded Multilayer Films for High Capacity optical Data Storage

Co-extruded Multilayer Films for High Capacity Optical Data ...

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conference on current developments in lens design and optical engineering XIII

作者： Christenson, Cory W. Ryan, Chris Valle, Brent Saini, Anuj Lott, Joseph Johnson, Jack Schiraldi, David Weder, Christoph Baer, Eric Singer, Kenneth D. Shan, Jie Case Western Reserve Univ Dept Phys Cleveland OH 44106 USA

ISBN: (纸本)9780819492036

New approaches for optical data storage (ODS) applications are needed to meet the future requirements of applications in multimedia, archiving, security, and many others. Commercial data storage technologies are moving to three-dimensional (3D) materials, but the capacity is limited by the fabrication cost and the number of layers that can be addressed using the reflection-based storage mechanism. We demonstrate here storage systems based on co-extrusion of multilayer (ML) films that can overcome these problems. The organic roll-to-roll films produced can easily be produced hundreds of meters in length, in a far simpler and cheaper manner than current manufacturing methods such as spin coating and lamination. The medium consists of alternating active and buffer layers, and data storage is demonstrated by writing images in 23 layers of 78 mu m thick films by fluorescence (FL) quenching of an organic dye. The areal data resolution is at the diffraction limit of the CW Blu-ray (BR) laser employed, and the co-extrusion technique allows for small layer spacings, leading to a total bit density 1.2 Tb/cm(3). We anticipate materials already demonstrated successful for 3D ODS will be adapted to this technique, as well as new systems developed, to take full advantage of this medium.

关键词： optical data storage extrusion photonics organic chromophore organic polymer photobleaching

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Research on properties of an infrared imaging diffractive element 15

Research on properties of an infrared imaging diffractive el...

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conference on current developments in lens design and optical engineering XV

作者： Rachon, M. Wegrzynska, K. Doch, M. Kolodziejczyk, A. Siemion, A. Suszek, J. Kakarenko, K. Sypek, M. Warsaw Univ Technol Fac Phys PL-00662 Warsaw Poland

ISBN: (纸本)9781628412192

Novel thermovision imaging systems having high efficiency require very sophisticated optical components. This paper describes the diffractive optical elements which are designed for the wavelengths between 8 and 14 mu m for the application in the FLIR cameras. In the current paper the authors present phase only diffractive elements manufactured in the etched gallium arsenide. Due to the simplicity of the manufacturing process only binary phase elements were designed and manufactured. Such solution exhibits huge chromatic aberration. Moreover, the performance of such elements is rather poor, which is caused by two factors. The first one is the limited diffraction efficiency (c.a. 40%) of binary phase structures. The second problem lies in the Fresnel losses coming from the reflection from the two surfaces (around 50%). Performance of this structures is limited and the imaging contrast is poor. However, such structures can be used for relatively cheap practical testing of the new ideas. For example this solution is sufficient for point spread function (PSF) measurements. Different diffractive elements were compared. The first one was the equivalent of the lens designed on the basis of the paraxial approximation. For the second designing process, the non-paraxial approach was used. It was due to the fact that f/# was equal to 1. For the non-paraxial designing the focal spot is smaller and better focused. Moreover, binary phase structures suffer from huge chromatic aberrations. Finally, it is presented that non-paraxially designed optical element imaging with extended depth of focus (light-sword) can suppress chromatic aberration and therefore it creates the image not only in the image plane.

关键词： infrared diffractive optics extended depth of focus Light Sword optical Element

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design of ophthalmic contact lens using Q-type aspheres with reduced error budget for high visual acuity 25

Design of ophthalmic contact lens using Q-type aspheres with...

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conference on current developments in lens design and optical engineering XXV

作者： Peng, Wei-Jei Lee, Tsung-Xian Natl Taiwan Univ Sci & Technol Grad Inst Appl Sci & Technol 43Sec 4Keelung Rd Taipei 106 Taiwan Natl Taiwan Univ Sci & Technol Grad Inst Color & Illuminat Technol 43Sec 4Keelung Rd Taipei 106 Taiwan

ISBN: (纸本)9781510679221;9781510679238

This paper investigates the design of an ophthalmic rigid contact lens (CL) that has a Q-type aspheric surface to reduce the tolerance error budget and produce higher visual acuity. CLs for myopia correction are typically made with spherical surfaces;when such CLs are worn in darkness, the visual acuity degrades severely due to the spherical aberration generated by pupil dilation. To maximize visual acuity, an aspheric CL is essential because it can correct the spherical aberration. In this study, a CL is designed based on a schematic eye model for evaluating the modulation transfer function (MTF) on the retina, and the result shows that the visual acuity produced by an aspheric CL is superior to that produced by a spherical CL. The traditional power-series polynomial is commonly used for aspheric surface design, but the aspheric slope cannot be controlled during optimization. The large slope departure from a best-fit sphere leads to high tolerance sensitivity and an inflection point;however, the CL does not permit such results. To solve this problem, the Q-type polynomial with slope constraint proposed by Forbes is applied to the aspheric CL in this study. The Q-type aspheric polynomial can not only enhance the optimization efficiency due to its orthogonal characteristics, but also reduce error budget for maximal manufacturing yield. The simulation results demonstrated that the spherical aberration is successfully reduced by the Q-type aspheric CL for better visual acuity in darkness.

关键词： Rigid contact lens Q-type asphere power-series asphere myopia correction spherical aberration schematic eye model

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Thermo-elastic wavefront and polarization error analysis of a telecommunication optical circulator

Thermo-elastic wavefront and polarization error analysis of ...

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conference on current developments in lens design and optical Systems engineering

作者： Doyle, KB Bell, MM Opt Res Associates Westborough MA USA

ISBN: (纸本)0819437387

Loss in optical fiber coupling efficiency and transmission are computed for a telecommunication optical circulator. optical performance degradation is due to thermally induced optical errors in the two beam splitter cubes. The computation of the optical errors is discussed for two materials and the effects illustrated. Bulk, volumetric absorption of the incident laser radiation from the input optical fiber and surface absorption via the coatings on the beam splitter interface generate temperature gradients. Loss in optical fiber coupling efficiency is produced by wavefront error caused by thermal expansion effects, and refractive index changes with temperature and stress. Transmission loss in the optical circulator is caused by polarization errors generated by the effects of stress birefringence. The optical errors were computed using temperatures generated from a Thermal Desktop model and displacements and stresses generated by a MSC/Nastran finite element model. The optical errors were imposed upon a Code V optical model to compute loss in fiber coupling efficiency and transmission in the optical circulator.

关键词： beam splitter cubes wavefront error fiber coupling efficiency optical circulator stress birefringence thermo-elastic analysis

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Using effective medium theories to design tailored nanocomposite materials for optical systems 19

Using effective medium theories to design tailored nanocompo...

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19th conference on current developments in lens design and optical engineering

作者： Werdehausen, Daniel Staude, Isabelle Burger, Sven Petschulat, Joerg Scharf, Toralf Pertsch, Thomas Decker, Manuel Carl Zeiss Corp Res & Technol Carl Zeiss Promenade 10 D-07745 Jena Germany Friedrich Schiller Univ Jena Abbe Ctr Photon Inst Appl Phys Albert Einstein Str 15 D-07745 Jena Germany Ecole Polytech Fed Lausanne Nanophoton & Metrol Lab CH-1015 Lausanne Switzerland JCMwave GmbH Bolivaralle 22 D-14050 Berlin Germany Zuse Inst Berlin Takustr 7 D-14195 Berlin Germany Carl Zeiss SMT GmbH Semicond Mask Solut Carl Zeiss Promenade 10 D-07745 Jena Germany Fraunhofer Inst Appl Opt & Precis Engn Albert Einstein Str 7 D-07745 Jena Germany

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

Modern optical systems are subject to very restrictive performance, size and cost requirements. Especially in portable systems size often is the most important factor, which necessitates elaborate designs to achieve the desired specifications. However, current designs already operate very close to the physical limits and further progress is difficult to achieve by changing only the complexity of the design. Another way of improving the performance is to tailor the optical properties of materials specifically to the application at hand. A class of novel, customizable materials that enables the tailoring of the optical properties, and promises to overcome many of the intrinsic disadvantages of polymers, are nanocomposites. However, despite considerable past research efforts, these types of materials are largely underutilized in optical systems. To shed light into this issue we, in this paper, discuss how nanocomposites can be modeled using effective medium theories. In the second part, we then investigate the fundamental requirements that have to be fulfilled to make nanocomposites suitable for optical applications, and show that it is indeed possible to fabricate such a material using existing methods. Furthermore, we show how nanocomposites can be used to tailor the refractive index and dispersion properties towards specific applications.

关键词： Nanocomposites Nanomaterials optical materials optical design optical Systems Dispersion engineering Effective medium theory Mie theory

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design of coded structured light based on square-shaped primitives 19

Design of coded structured light based on square-shaped prim...

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19th conference on current developments in lens design and optical engineering

作者： Lau, Chi-Chung Sun, Ching-Chern Yang, Tsung-Hsun Yu, Yeh-Wei Chou, Si-Min Ind Technol Res Inst Green Energy & Environm Res Labs Bldg 24195Sec 4Chung Hsin Rd Hsinchu 31057 Taiwan Natl Cent Univ Dept Opt & Photon Kwoh Ting Opt & Photon Bldg300 Jhongda Rd Taoyuan 32001 Taiwan

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

This paper presents a new pattern design for encoding structured light for scanning 3D surface and the decoding process. The basic unit of the pattern is a code-block that contains one central label and eight square-shaped primitives that provide two functions: code-block indexing and point-positions for triangulating. The square-shaped primitive has one notch in a different position to represent 8 digit numbers, which are easily to convert label to number for indexing code-block. One primitive also contributes five point-positions, centroid and four extreme, for triangulating and estimating 3D information. The design of code-block has eight 8-bit numbers allowing a higher error-tolerant and providing better resolution in 3D reconstruction. Experiment shows that the proposed pattern is suitable for indoor mapping and large scene scanning.

关键词： coded structured light primitives 3-D data acquisition computer vision

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design, manufacturing and opto-mechanical considerations for multimodal micro-endoscope featuring optical coherence microscopy, multiphoton microscopy and visible navigation 7

Design, manufacturing and opto-mechanical considerations for...

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conference on optical design and engineering vii

作者： Vega, David Romano, Gabriella Barton, Jennifer K. Univ Arizona Coll Opt Sci Tucson AZ 85721 USA Univ Arizona Biomed Engn Tucson AZ 85721 USA

ISBN: (数字)9781510619180

ISBN: (纸本)9781510619180

Complex endoscopes which utilize optics with less than 1.5 mm diameter have an elevated risk of failure. Therefore, to ensure functionality and minimize risk proper design, optomechanical analysis and modelling must be performed while taking into consideration current manufacturing capabilities. Our endoscope is designed to perform optical Coherence and Multiphoton Microscopy (OCM and MPM) which are powerful endoscopic imaging techniques used to characterize tissue. Separately each imaging technique has limitations when used by itself;however, this design combines these two modalities into a single optical system to work in synergy achieving both high sensitivity and specificity for diagnosis at the point of care. The optical design features two optical paths with different numerical apertures (NA) through a single lens system with a scanning optical fiber. The dual path is achieved using dichroic coatings embedded in a triplet that functions in a telescope like fashion. A high NA similar to 0.44 path is designed to perform OCM and MPM while a low NA similar to.18 path is designed for the visible spectrum to allow navigation of the endoscope to areas of interest. We present the optical design of the endoscope, optomechanical considerations, manufacturability, stress and temperature effects. All these factors may be a source of problems in such small optics utilizing rare materials such as ZnS MS lenses. While very tight tolerances were the driving factor for the manufacturability of this system, temperature and stress must also be evaluated to obtain a better idea of the durability of the endoscope at the point of care. While it is challenging to evaluate the real performance of multimodality endoscopes, the models ensure that the system is designed for the expected imaging techniques, providing acceptable imaging across the entire field of view. Finally, we will give insight on what lessons were learned during the design, analysis, lens manufacturing, and assemblin

关键词： micro-endoscope microscopy micro-optics optical design multimodal endoscopy optomechanical design optical models

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High-resolution UV relay lens for particle size distribution measurements using holography

High-resolution UV relay lens for particle size distribution...

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conference on current developments in lens design and optical engineering IX

作者： Malone, Robert M. Capelle, Gene A. Cox, Brian C. Frogget, Brent C. Grover, Mike Kaufman, Morris I. Pazuchanics, Peter Sorenson, Danny S. Stevens, Gerald D. Tibbitts, Aric Turley, William D. Natl Secur Technol LLC Los Alamos Operat 182 E Gate Dr Los Alamos NM 87544 USA Natl Secur Technol LLC Special Technol Lab Santa Barbara CA 93111 USA Los Alamos Natl Lab Los Alamos NM 87545 USA

ISBN: (纸本)9780819472809

Shock waves passing through a metal sample can produce ejecta particulates at a metal-vacuum interface. Holography records particle size distributions by using a high-power, short-pulse laser to freeze particle motion. The sizes of the ejecta particles are recorded using an in-line Fraunhofer holography technique. Because the holographic plate would be destroyed in an energetic environment, a high-resolution lens has been designed to relay the scattered and unscattered light to a safe environment where the interference fringes are recorded on film. These interference fringes allow particles to be reconstructed within a 12-mm-diameter, 5-mm-thick volume. To achieve resolution down to 0.5 mu m, both a high-resolution optical relay lens and ultraviolet laser (UV) light were implemented. The design and assembly of a nine-element lens that achieves > 2000 lp/mm resolution and operates at f/0.89 will be described. To set up this lens system, a doublet lens is temporarily attached that enables operation with 532-nm laser light and 1100 lp/mm resolution. Thus, the setup and alignment are performed with green light, but the dynamic recording is done with UV light. During setup, the 532-nm beam provides enough focus shift to accommodate the placement of a resolution target outside the ejecta volume;this resolution target does not interfere with the calibrated wires and pegs surrounding the ejecta volume. A television microscope archives images of resolution patterns that prove that the calibration wires, interference filter, holographic plate, and relay lenses are in their correct positions. Part of this lens is under vacuum, at the point where the laser illumination passes through a focus. Alignment and tolerancing of this high-resolution lens will be presented, and resolution variation through the 5-mm depth of field will be discussed.

关键词： UV optical relay holography submicron optical resolution ejecta particle size distribution

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Optimizing trefoil phase plates design for color wavefront coding 19

Optimizing trefoil phase plates design for color wavefront c...

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19th conference on current developments in lens design and optical engineering

作者： Olvera-Angeles, Miguel Padilla-Vivanco, Alfonso Ortega, Karina Sasian, Jose Schwiegerling, Jim Arines, Justo Acosta, Eva Univ Politecn Tulancingo Hidalgo 43629 Mexico Univ Arizona Coll Opt Sci Tucson AZ 85721 USA Univ Santiago de Compostela Fac Fis Santiago De Compostela 15782 Spain

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

Wavefront coding refers to the use of a phase modulating element in conjunction with deconvolution to extend the depth of focus of an imaging system. The coding element is an asymmetrical phase plate shape, for most applications in the form of a trefoil or a cubic polynomial. Phase plates with trefoil shape generate not only the desired amount of trefoil aberration but also spherical aberration. It has been recently shown that a wavefront coding based optical system shows high tolerance to spherical aberration for monochromatic images;however, the depth of focus is considerably shortened for color images. In this work, we will show how to modify the shape of a phase plate in order to optimize its performance for color imaging. The design parameters of the phase plate are obtained by minimizing a merit function by means of genetic algorithms developed for this purpose. The evaluation of the optical characteristics of the phase plates for a feedback with the optimization algorithm is obtained by Zemax. Results will be illustrated by numerical simulations of color images.

关键词： Wavefront coding spherical aberration color imaging optimization genetic algorithms

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Contact lens design with slope-constrained Q-type aspheres for myopia correction 18

Contact lens design with slope-constrained Q-type aspheres f...

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conference on current developments in lens design and optical engineering XviiI

作者： Peng, Wei-Jei Cheng, Yuan-Chieh Hsu, Wei-Yao Yu, Zong-Ru Ho, Cheng-Fang Abou-El-Hossein, Khaled Natl Appl Res Labs Instrument Technol Res Ctr Taiwan 20R&D Rd 6Hsinchu Sci Pk Hsinchu 300 Taiwan Nelson Mandela Metropolitan Univ Precis Engn Lab ZA-6031 Port Elizabeth South Africa

ISBN: (纸本)9781510612082;9781510612075

The design of the rigid contact lens (CL) with slope-constrained Q-type aspheres for myopia correction is presented in this paper. The spherical CL is the most common type for myopia correction, however the spherical aberration (SA) caused from the pupil dilation in dark leads to the degradation of visual acuity which cannot be corrected by spherical surface. The spherical and aspheric CLs are designed respectively based on Liou's schematic eye model, and the criterion is the modulation transfer function (MTF) at the frequency of 100 line pair per mm, which corresponds to the normal vision of one arc-minute. After optimization, the MTF of the aspheric design is superior to that of the spherical design, because the aspheric surface corrects the SA for improving the visual acuity in dark. For avoiding the scratch caused from the contact profilometer, the aspheric surface is designed to match the measurability of the interferometer. The Q-type aspheric surface is employed to constrain the root-mean-square (rms) slope of the departure from a best-fit sphere directly, because the fringe density is limited by the interferometer. The maximum sag departure from a best-fit sphere is also controlled according to the measurability of the aspheric stitching interferometer (ASI). The inflection point is removed during optimization for measurability and appearance. In this study, the aspheric CL is successfully designed with Q-type aspheres for the measurability of the interferometer. It not only corrects the myopia but also eliminates the SA for improving the visual acuity in dark based on the schematic eye model.

关键词： aspheric contact lens Q-type aspheres myopia spherical aberration schematic eye model visual acuity best-fit sphere

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