Browsing by Author "Jeng, Tzuan-Ren"

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Ge/Al bilayer thin film for optical write-once media
(2007-01-01)
Wu, T. H.
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Kuo, P. C.
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Chen, Jung-Po
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Wu, Chih-Yuan
;
Yen, Po-Fu
Ge/Al bilayer thin films are prepared by magnetron sputtering. Thermal analysis shows that the phase change of the film occurs at 275 degrees C. Contrasts at 650 rim and 405 nm wavelength are 71.4% and 31.1% respectively.
Microstructure and recording mechanism of Ge/Au bilayer media for write-once optical disc
(2007-04-09)
Wu, T. H.
;
Kuo, P. C.
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Fang, Yen-Hsiang
;
Chen, Jung-Po
;
Yen, Po-Fu
The recording mechanism of Ge/Au bilayer and its dynamic tests for write-once blue laser high density DVD (HD DVD) are investigated. It is found that Ge2Au3 phase is nucleated between amorphous Ge and crystalline Au layer after room temperature deposition. Crystallization of Ge/Au interface layer at 170-190 degrees C is induced by the nucleated Ge2Au3 sites at the interface, the bilayer structure is further heated to 200-450 degrees C. After heating above 320 degrees C, crystallized Ge are segregated at the grain boundary. The dynamic test results show that this Ge/Au bilayer films can be applied to 1x-2x HD DVD-R. (c) 2007 American Institute of Physics.
Optimization of the lens holder and yoke for a near-field optical pickup actuator to enhance frequency response
(2007-02-01)
Peng, Ming-Tsan
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Huang, Hai-Jo
;
Wu, Chun-Te
;
Lee, Kwen-Jin
;
Yang, Lei-Ming
A four-wire voice-coil actuator is designed and optimized for use in a near-field optical drive. The first objective was to design a lens holder which could accommodate a large-size lens module while possessing a strong mechanical structure. The second objective was to optimize the yoke so that the magnetic field would be uniform within the stroke range of the voice coils. These improvements eventually helped to improve the bandwidth of the frequency response of the actuator.