Browsing by Author "Su, JC"

Now showing 1 - 3 of 3

Multi-port polarization-independent optical quasi-circulators by using a pair of holographic spatial- and polarization-modules
(2004-02-23)
Chen, JH
;
Hsieh, PJ
;
Su, DC
;
Su, JC
;
光電工程學系
In this paper we proposed an alternative type of multi-port polarization-independent optical quasi-circulator by using a pair of holographic spatial- and polarization-modules. The prototype is fabricated and experimentally tested. In addition, the operating principles, the characteristics and the performances of this device are discussed. The merits of this design include polarization-independence, compactness, high isolation, low polarization mode dispersion, and easy fabrication. Furthermore, the number of ports can be scaled up easily. (C) 2004 Optical Society of America.
RTE lag in diffractive optical element etching
(2000-12-01)
Ting, JH
;
Su, JC
;
Su, SY
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
In this study, the pattern of a 4 mm diameter diffractive optical element with linewidth ranging from 12 to 0.5 mum was adopted. With the SiO2 layer as the etch hard mask, silicon was etched based on HBr chemistry with additions of O-2 and SF6 . The effects of O-2 content on the sidewall anisotropy, etch rate, and etch selectivity over the SiO2 mask were also examined. The RIE lag, where etching of a small trench (hole) lags behind a large trench (hole), was investigated to produce an optimum aspect ratio for each zone of the diffractive optical element. The regression relation of the etch depth versus zone width was determined as a guideline for the feasibility of this method. (C) 2000 Elsevier Science B.V. All rights reserved.
Shrinkage- and refractive-index shift-corrected volume holograms for optical interconnects
(2002-08-19)
Chen, JH
;
Su, DC
;
Su, JC
;
光電工程學系
;
Department of Photonics
The Bragg mismatching condition for volume holograms occurs because of the changes in the thickness and the refractive index of holographic recording materials during the recording and reconstruction procedures. We propose an improved compensation method to physically correct these effects in the fabrications of volume holograms for optical interconnects. In order to show the validity of this method, Slavich photographic plate VRP-M is used to fabricate optical interconnects. The correction of the Bragg diffraction angle shift of about 2.10degrees, which is induced by 6.14% film shrinkage and 0.06 refractive index shift, is successfully demonstrated with the surface-normal configuration. A shrinkage- and refractive-index shift-corrected volume hologram with 23% diffraction efficiency is experimentally confirmed. The methodology proposed is applicable to other phase media when the associated film shrinkage and refractive-index shift data are experimentally determined. (C) 2002 American Institute of Physics.