Browsing by Author "Chung, Te-Yuan"

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Modeling the Diffraction Efficiency o f Reflective-Type PQ-PMMA VBG Using Simplified Rate Equations
(2018-12-01)
Shih, Bao-Jen
;
Chen, Cuan-Wen
;
Hsieh, Yu-Hua
;
Chung, Te-Yuan
;
Lin, Shiuan-Huei
A simulation based on the rate equations was performed to analyze the concentration distribution of molecules in phenanthrenequinone (PQ) doped polymethyl methacrylate (PMMA) polymers (PQ-PMMAs) exposed using a two-beam interference configuration. The concentration distributions were used to predict the diffraction efficiency of PQ-PMMA-based volume Bragg gratings (VBGs) by using the transfer matrix method. The simulation results suggest that an intermittent exposure method can promote the diffusion of PQ molecules and increase the final diffraction efficiency. A series of experiments validated our hypothesis that the diffraction efficiency of reflective-type PQ-PMMA VBG can be predicted.
Wavelength-multiplex and space-multiplex holographic storage device
(2010-03-25)
Su, Wei-Chia
;
Chen, Yeh-Hung
;
Chung, Te-Yuan
The present invention discloses a wavelength-multiplex and space-multiplex holographic storage device, which comprises a storage medium, a plurality of signal light beams and at least one reference light beam. The signal light beams have different wavelengths and illuminate the storage medium. The reference light beam illuminates the storage medium and interferes with the signal light beams to form a plurality of interference patterns. The interference patterns are respectively stored on different-depth storage layers of the storage medium. The present invention not only has a high access rate but also has a large storage capacity.