Browsing by Author "Kuan, Wen-Hsuan"

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Spectral properties and magneto-optical excitations in semiconductor double rings under Rashba spin-orbit interaction
(2007-04-01)
Kuan, Wen-Hsuan
;
Tang, Chi-Shung
;
Chang, Cheng-Hung
;
物理研究所
;
Institute of Physics
We have numerically solved the Hamiltonian of an electron in a semiconductor double ring subjected to the magnetic flux and Rashba spin-orbit interaction. It is found that the Aharonov-Bohm energy spectrum reveals multizigzag periodic structures. The investigations of spin-dependent electron dynamics via Rabi oscillations in two-level and three-level systems demonstrate the possibility of manipulating quantum states. Our results show that the optimal control of photon-assisted inter-ring transitions can be achieved by employing cascade-type and Lambda-type transition mechanisms. Under chirped pulse impulsions, a robust and complete transfer of an electron to the final state is shown to coincide with the estimation of the Landau-Zener formula.
Ultrabroadband Tunable Long-Period Fiber Grating for Stress Sensing and Optical Filtering
(2017-01-01)
Chen, Hou-Ren
;
Kuan, Wen-Hsuan
;
Lin, Kuei-Huei
;
光電工程學系
;
Department of Photonics
Both constant-period and broadband chirped long-period gratings (LPGs) are generated in photonic crystal fibers (PCFs) by using a constant period V-grooved plate or solenoidal wiring device. The central wavelength and rejection bandwidth of LPGs can be tuned over a broad spectral range with adjustable transmission loss. In contrast to the conventional LPG sensors with longitudinal stretch or compression, the PCF-LPGs can be used for sensing the lateral pressure. They have potential applications for stress sensors and versatile optical filters.