Browsing by Author "Chen, Tien-Jung"

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Brightness Enhancement with a Fingerprint Chiral Nematic Liquid Crystal
(2011-03-01)
Lee, King-Lien
;
Wu, Jin-Jei
;
Chen, Tien-Jung
;
Wu, Yeong-Shiun
;
Chen, Fu-Chen
We demonstrate a brightness enhancement element that can be laminated to a linear polarizer for increasing the optical efficiency of a liquid crystal display device. The device structure is a chiral nematic liquid crystal (CNLC) with a fingerprint texture. For an unpolarized incident light, our experimental results show that the combination of a CNLC film and a conventional linear polarizer can achieve a transmittance of over 50%. The CNLC film increases the optical efficiency of a conventional polarizer by 21.7%. The detailed mechanism of such a CNLC-polarizer system is analyzed. (C) 2011 The Japan Society of Applied Physics
Use of modal interference for probing birefringence induced in a bent optical fiber
(2006-11-15)
Chen, Tien-Jung
;
Lin, Yi-Hsin
;
光電工程學系
;
Department of Photonics
We report a novel method that utilizes two lowest-order modes, HE11 and TE01, to probe birefringence induced in a bent circular-core optical fiber. The interference patterns of the two modes are examined by using a polarizer at the fiber output end. The contrast that is extracted from the interference pattern is periodically modulated as a function of phase retardation between the two modes, while the shift of the contrast function shows a strong dependence on the fiber birefringence as the polarizer rotates. Theoretical description followed by the test results demonstrates the feasibility of the method. (c) 2006 Optical Society of America.