Browsing by Author "Tien, C. H."

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Aberrations measurement of fiber-end microlens by free-space microoptical Ronchi interferometer
(2006-07-01)
Tien, C. H.
;
Hung, C. H.
;
Lee, C. H.
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光電工程學系
;
顯示科技研究所
We developed a microoptical Ronchi interferometer system in which a V-groove, an out-of-plane grating, a beam splitter, and a 45 degrees upward reflector integrated on a single silicon chip were used to measure the wavefront aberration caused by a microlens on the fiber front end. By the use of the microelectromechanical systems configuration, the fringe patterns caused by the different spherical aberration and defocus balances of the 0.34-numerical-aperture microlens can be captured and analyzed accordingly. As demonstrated by the experimental results, the proposed setup is capable of carrying out a simple wavefront variation measurement in the microscopic scale.
Micromachined polarization beam splitter with adjustable leak ratio for optical pickup
(2007-07-01)
Tien, C. H.
;
Hung, C. H.
;
光電工程學系
;
顯示科技研究所
;
Department of Photonics
In this letter, we propose the optomechanical design and fabrication of a novel batched-processed polarization beam splitter (PBS) with an adjustable leak ratio for optical recording applications. The micro-PBS was fabricated by a 410-nm low stress silicon nitride Si3N4 membrane integrated with a bimorph actuator. A de drive voltage was applied to allow an adjustable leak ratio (0-0.24) with incident angle from 65 degrees to 75 degrees for operation in the different optical requirements (phase-change and magneto-optical disks) at lambda = 633 nm. The characteristics of the fabricated PBS are in close agreement with the theoretical calculations and confirm its feasibility.