Browsing by Author "Lin, Chuan-Hsien"

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Electrically Controlled Liquid Crystal Phase Grating for Terahertz Waves
(2009-05-01)
Lin, Chia-Jen
;
Lin, Chuan-Hsien
;
Li, Yu-Tai
;
Pan, Ru-Pin
;
Pan, Ci-Ling
This work demonstrates the feasibility of electrically controlled liquid-crystal-based phase grating for manipulating the terahertz (THz) waves. This device can be utilized as a THz beam splitter and the beam splitting ratio of the zeroth- to the first-order diffractions can be tuned from 10 : 1 to 1: 1.
Some Characteristics of a Liquid-Crystal Phase Grating for THz Waves
(2009)
Lin, Chia-Jen
;
Lin, Chuan-Hsien
;
Hsieh, Cho-Fan
;
Pan, Ru-Pin
;
Li, Yu-Tai
We propose and demonstrate an electrically controlled liquid crystal phase grating for the terahertz wave. The performance of the device was characterized by a terahertz time-domain spectrometer. The experimental results were in a good agreement with the prediction by classic diffraction theory.
Sub-single-cycle optical pulse train with constant carrier envelope phase
(2008-04-25)
Chen, Wei-Jan
;
Hsieh, Zhi-Ming
;
Huang, ShuWei
;
Su, Hao-Yu
;
Lai, Chien-Jen
We describe the synthesis of periodic waveforms consisting of a train of pulses that are 0.83 cycles long and have an electric field pulse width of 0.44 fs using 7 Raman sidebands generated by molecular modulation in H(2). We verify by optical correlation that the carrier-envelope phase is constant in these waveforms when they are synthesized from commensurate sidebands. The estimated overall shift of the carrier-envelope phase is less than 0.18 cycles from the first to the last pulse of nearly 10(6) pulses in the pulse train.