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Now showing 1 - 9 of 9

Holographic data storage with a planar-integrated optical write-read head
(2009-01-01)
Soellner, Matthias
;
Vieth, Udo
;
Hsu, Ken Yuh
;
Lin, Shiuan Huei
;
Gruber, Matthias
The construction of a write-once-read-many-type optical write-read-head for volume holographic data storage in disk-based photopolymer storage media is discussed. Its design is based on the photonic integration concept called planar-integrated free-space optics. A proof-of-principle demonstrator was fabricated, it contains a 3mm thick fused silica wafer that carries most passive components for the reference and the signal beam relay in the form of diffractive optical elements, a translucent liquid crystal microdisplay, and the CCD sensor of a webcam. Phenanthrenequinone-doped polymethylmethacrylate was chosen as storage material, a DPSS laser with lambda = 532nm serves as light source. We report about preliminary experiments to determine suitable exposure parameters for holographic write-read operations, and on the use of data matrix codes for the encoding and decoding of information.
Two-wavelength holographic recording in photopolymer using four-energy-level system: experiments and modeling
(2014-11-01)
Lin, Chun-Hua
;
Cho, Sheng-Lung
;
Lin, Shiuan-Huei
;
Chi, Sien
;
Hsu, Ken-Yuh
We investigate a two-wavelength method for recording a persistent hologram in a doped photopolymer. The recording method is based on two separated optical excitations of the four-energy-level system of the doped element, one at lambda = 325 nm as the sensitizing wavelength and the other at lambda = 647 nm as the writing wavelength, allowing for an experimental demonstration of nondestructive readout in phenanthrenequinone-doped poly(methyl methacrylate). Further, a four-energy-level rate equations model is proposed for describing the dynamics of hologram recording. The model successfully explains our experimental finding and further provides a general method to investigate such a two-wavelength holographic recording in photopolymer. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
Comparison of the recording dynamics of phenanthrenequinone-doped poly(methyl methacrplate) materials
(2001-07-01)
Mumbru, J
;
Solomatine, I
;
Psaltis, D
;
Lin, SH
;
Hsu, KY
A comparative analysis of phenanthrenequinone-doped poly(methyl methacrylate) materials fabricated at California Institute of Technology and National Chiao Tung University is performed in order to understand the differences exhibited in their recording and baking dynamics. (C) 2001 Published by Elsevier Science B.V.
Two-wavelength holographic recording in photopolymer using four-energy-level system: experiments and modeling
(2014-11-01)
Lin, Chun-Hua
;
Cho, Sheng-Lung
;
Lin, Shiuan-Huei
;
Chi, Sien
;
Hsu, Ken-Yuh
We investigate a two-wavelength method for recording a persistent hologram in a doped photopolymer. The recording method is based on two separated optical excitations of the four-energy-level system of the doped element, one at lambda = 325 nm as the sensitizing wavelength and the other at lambda = 647 nm as the writing wavelength, allowing for an experimental demonstration of nondestructive readout in phenanthrenequinone-doped poly(methyl methacrylate). Further, a four-energy-level rate equations model is proposed for describing the dynamics of hologram recording. The model successfully explains our experimental finding and further provides a general method to investigate such a two-wavelength holographic recording in photopolymer. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
Effect of ZnMA on optical and holographic characteristics of doped PQ/PMMA photopolymer
(2005-02-01)
Hsiao, YN
;
Whang, WT
;
Lin, SH
;
材料科學與工程學系
;
電子物理學系
We report on the fabrication and experimental characteristics of doping Zinc methylacrylate (ZnMA) and 9,10-phenanthrenequinone (PQ) into a poly(methyl methacrylate) (PMMA) photopolymer. The effects of a ZnMA dopant on the optical and holographic characteristics of ZnMA/PQ/PMMA have been examined. From the optical and holographic measurements of different samples with different composition ratios, we found that the time to reach the maximum diffraction efficiency has been reduced from 102 to 59 (reduced by 1.7 times) and the diffraction efficiency has been raised up from 0.57 to 1.62% (increased by 2.9 times). We also found that holographic gratings can be recorded in pure PQ-doped PMMA, but cannot be recorded in pure ZnMA-doped PMMA. The higher the concentration of PQ in codoped PMMA, the higher the diffraction efficiency. In contrast, the higher ZnMA concentration in the codoped PMMA, the shorter the response time. It is proposed that PQ serves as a photosensitive reactant and plays a major role in the formation of phase gratings. ZnMA serves as a sufficient catalyst to accelerate the reaction of PQ with a polymer or ZnMA. By adding ZnMA with a proper concentration into a PQ/PMMA photopolymer, we succeeded in improving the holographic characteristic of the photopolymer.
Two-wavelength holographic recording in thick phenanthrenequinone-doped poly(methyl methacrylate) photopolymer
(2012-03-01)
Chen, Po-Lin
;
Cho, Sheng-Lung
;
Lin, June-Hua
;
Lin, Shiuan-Huei
;
Hsu, Ken Y.
Two-wavelength holographic recording in thick phenanthrenequinone-doped poly(methyl methacrylate) photopolymer is demonstrated. By using 325 nm laser as a gating illumination during the holographic recording with 647 nm laser, a volume hologram with diffraction efficiency of similar to 4% can be recorded in a 2 mm thick sample. In addition, the Bragg selectivity curve with clear sinc nulls is demonstrated. These results support further applications as recording media for volume holographic device with extended spectral response and selective recording property. (C) 2012 ociety of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.OE.51.3.030503]
Fabrication and characterization of thick zinc methacrylate/phenanthrenequinone codoped poly(methyl methacrylate) photopolymers for volume holographic recording
(2006-11-01)
Hsiao, Yi-Nan
;
Whang, Wha-Tzong
;
Lin, Shiuan Huei
;
Hsu, Ken Y.
;
材料科學與工程學系
We fabricate and characterize a novel holographic recording photopolymer named ZnMA/PQ co-doped PMMA, a poly(methyl methacrylate) (PMMA) doped with two materials: zinc methacrylate (ZnMA) and 9,10-phenanthrenequinone (PQ) molecules. A technique for fabricating thick samples of 2mm thick is described. The optical and holographic characteristics of the samples are experimentally investigated. The results show that by adding ZnMA, the material M/# and sensitivity for holographic recording have been improved.
One-shot exposure for patterning two-dimensional photonic crystals to enhance light extraction of InGaN-based green LEDs
(2008-01-01)
Hsieh, Mei-Li
;
Lo, Kuo-Chang
;
Lan, Yi-Sheng
;
Yang, S. Y.
;
Lin, C. H.
To promote the feasibility of using photonic crystals to enhance light extraction of light-emitting diodes (LEDs) for industrial applications, the request for the high-yield and simple exposure process to pattern two-dimensional photonic crystals (2DPCs) becomes rather urgent. In this work, we developed a one-shot three-beam laser interference system-to fabricate a 2DPC on an InGaN-based green LED to address its performance for backlight display applications. Using the current exposure system we develop here, a submicro-patterned area of 6 mm in diameter can be achieved. The experimental results show that the operating voltage of a 1 x 1 mm(2) in-area LED incorporated with the 2DPC is around 4 V, and the light extraction efficiency is enhanced by a factor of 2.1.
Preparation and characterization of Irgacure 784 doped photopolymers for holographic data storage at 532 nm
(2009-02-01)
Lin, S. H.
;
Hsiao, Y-N
;
Hsu, K. Y.
;
電子物理學系
;
光電工程學系
This paper presents the development of a thick photopolymer for holographic data storage at a wavelength of 532 nm. Irgacure 784, one kind of the titanocene photoinitiators, has been selected and doped to synthesize the photopolymers in this research. Using a two-step thermo-polymerization procedure two photopolymer samples have been fabricated, Irgacure 784 doped poly(methyl methacrylate) (PMMA) and Irgacure 784 doped epoxy resin. Samples of 2 mm thick have been fabricated. Holographic measurements show that Irgacure 784 doped epoxy resin is very sensitive at 532 nm and that it is capable of supporting holographic data storage at a ultra-fast recording rate of 760 Mb s(-1). Mass spectrum measurement, solid state 1H-NMR spectrum measurement, and thermogravity analyses (TGA) have been performed. The results reveal the physical mechanism of holographic recording in these samples, providing a guideline for a design strategy and fabrication technique to produce a low-shrinkage recording material for holographic data storage in the tera-byte information age.

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