Browsing by Author "Hsu, K. S."

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Compact microdisk cavity laser with type-II GaSb/GaAs quantum dots
(2011-01-31)
Hsu, K. S.
;
Chiu, T. T.
;
Lin, Wei-Hsun
;
Chen, K. L.
;
Shih, M. H.
Microdisk lasers with active region made of type-II GaSb/GaAs quantum dots on the GaAs substrate have been demonstrated. A microdisk cavity with diameter of 3.9 mu m was fabricated from a 225-nm-thick GaAs layer filled with GaSb quantum dots. Lasing at wavelengths near 1000 nm at 150 K was achieved for this microdisk. A high threshold characteristic temperature of 77 K was also observed. It is found that the lasing wavelength matches closely with the first-order whispering-gallery mode of the cavity as obtained from the finite-element method simulation. (c) 2011 American Institute of Physics. [doi: 10.1063/1.3543839]
Compact optical curvature sensor with a flexible microdisk laser on a polymer substrate
(2009-09-15)
Shih, M. H.
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Hsu, K. S.
;
Kunag, Wan
;
Yang, Y. C.
;
Wang, Y. C.
We demonstrate a chip-scale compact optical curvature sensor. It consists of a low threshold InGaAsP microdisk laser on a flexible polydimethylsiloxane polymer substrate. The curvature dependence of lasing wavelength was characterized by bending the cavity at different bending radii. The measurements showed that the lasing wavelength decreases monotonously with an increasing bending curvature. A good agreement between experiment and three-dimensional finite-difference time-domain simulation was also obtained. The sensitivity of the compact device to the bending curvature is -23.7 nm/mm from the experiment. (C) 2009 Optical Society of America
Flexible Photonic Crystal Defect Lasers on a Polydimethylsiloxane Polymer Substrate
(2010)
Hsu, K. S.
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Yang, Y. C.
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Tsai, Y. Y.
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Shih, M. H.
;
Wu, M. C.
We demonstrated a flexible photonic crystal defect laser on a polydimethylsiloxane (PDMS) polymer substrate. The curvature dependences of lasing power and threshold were also characterized by bending the photonic crystal cavity at different bending curvatures. (C) 2010 Optical Society of America
Long Photon Lifetime from Microdisk Cavity Laser with Type II GaSb/GaAs Quantum Dots
(2013-01-01)
Hsu, K. S.
;
Chang, C. C.
;
Lin, W. H.
;
Shih, M. H.
;
Lin, S. Y.
Microdisk lasers with active region made of type II GaSb/GaAs quantum dots on the GaAs substrate have been demonstrated. Lasing wavelengths near 1 mu m was achieved and longer photon lifetime from type II structure also observed. (C) 2013 Optical Society of America