Browsing by Author "Cheng, Chih-Yuan"

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Method of compensating for pixel migration in volume holographic optical disc (VHOD)
(2012-09-10)
Yu, Yeh-Wei
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Cheng, Chih-Yuan
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Teng, Tun-Chien
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Chen, Cheng-Hsien
;
Lin, Shiuan-Huei
Volume holographic optical disc (VHOD) technology is simpler than the angular multiplexing holographic system. However, disc rotation usually causes pixel migration, thus reducing signal quality. This study proposes a special geometrical arrangement to counteract pixel migration. Using paraxial approximation analysis, an optimal geometrical distance ratio, K, is calculated to compensate for pixel migration and improve image quality during disc rotation. The results of approximation analysis are confirmed by both simulation and experimental results. (C) 2012 Optical Society of America
Nanometer-sized diamond particle as a probe for biolabeling
(2007-09-01)
Chao, Jui-I.
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Perevedentseva, Elena
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Chung, Pei-Hua
;
Liu, Kuang-Kai
;
Cheng, Chih-Yuan
A novel method is proposed using nanometer- sized diamond particles as detection probes for biolabeling. The advantages of nanodiamond's unique properties were demonstrated in its biocompatibility, nontoxicity, easily detected Raman signal, and intrinsic fluorescence from its natural defects without complicated pretreatments. Carboxylated nanodiamond's ( cND's) penetration ability, noncytotoxicity, and visualization of cND- cell interactions are demonstrated on A549 human lung epithelial cells. Protein- targeted cell interaction visualization was demonstrated with cND- lysozyme complex interaction with bacteria Escherichia coli. It is shown that the developed biomolecule- cND complex preserves the original functions of the test protein. The easily detected natural fluorescent and Raman intrinsic signals, penetration ability, and low cytotoxicity of cNDs render them promising agents in multiple medical applications.
Reduction of phase error on phase-only volume-holographic disc rotation with pre-processing by phase integral
(2020-09-14)
Yu, Yeh-Wei
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Chen, Yuan-Cheng
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Huang, Kun-Hao
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Cheng, Chih-Yuan
;
Yang, Tsung-Hsun
In this paper, we present a study of observation of phase error of a volume holographic storage disc during the reading process when the disc is rotated or displaced in the theoretical calculation and the corresponding experiment. This additional phase error will dramatically decrease the bit error rate of a phase-only signal, even applying double-frequency shearing interferometry to retrieve the stored phase signal. Then we propose a novel approach to solve the problem. The stored signal is pre-processed by phase integral along the shearing direction so that applying the integral process to decode the phase signal is not necessary in the readout process. The proposed approach effectively reduces the error in phase retrieval and will be useful when applying double-frequency shearing interferometry in the readout process for volume holographic storage. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement