Browsing by Author "Chen, Chih-Heng"

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Switching of Defect Modes in a Photonic Structure with a Tristable Smectic-A Liquid Crystal
(2012-08-01)
Chen, Chih-Heng
;
Zyryanov, Victor Ya.
;
Lee, Wei
;
光電學院
;
College of Photonics
"A one-dimensional (1D) photonic crystal (PC) optical device based on smectic-A (SmA) liquid crystal (LC) as a defect layer is proposed. The reversible tristability of the SmA LC is used to realize a low-energy-consumption device. With a voltage-induced scattering state, the PC-SmA hybrid cell can work as a polarizer-free optical switch. The variation of the effective refractive index of the LC substance enables the defect modes to appear at variable wavelengths, changing with the voltage-induced reorientation of the LC director. As a result, an electrically and thermally tunable multichannel optical device is achieved using this hybrid, optically tristable structure. (c) 2012 The Japan Society of Applied Physics"