Browsing by Author "Chiu, Li-Hsun"

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Dielectric-Band Photonic Crystal Nanobeam Lasers
(2013-01-01)
Lee, Po-Tsung
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Lu, Tsan-Wen
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Chiu, Li-Hsun
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交大名義發表
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光電工程學系
We investigate a mode gap confined dielectric band laser via a 1-D photonic crystal (PhC) nanobeam (NB) nanocavity with lattice gradually shifted PhC mirror. Owing to different modal symmetries, different zeroth-order dielectric mode properties, including quality (Q) factors, mode volumes, lasing thresholds, and slope efficiencies, in nanocavities with two different cavity sizes are investigated. In experiments, single-mode lasing from dielectric bands with low effective lasing thresholds is obtained. Rising of the high-order modes is also observed when we increase the PhC mirror periods for high Q factor of the zeroth-order dielectric mode. In addition, we observe the bonding and antibonding modes in beamwidth mismatched coupled NB nanocavities and switch the dominant lasing mode via spatially nonuniform carrier injection.
One-dimensional photonic crystal nanobeam lasers on a flexible substrate
(2011-08-15)
Lu, Tsan-Wen
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Chiu, Li-Hsun
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Lin, Pin-Tso
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Lee, Po-Tsung
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光電工程學系
We demonstrate a one-dimensional (1D) photonic crystal (PhC) nanocavity laser composed of hybrid PhC mirrors on a suspended nanobeam (NB) with very small device footprint of 8.5 x 0.57 mu m(2). The 0th-order mode lasing action with low threshold of 280 mu W is observed. Via the optical glue stamping process, the devices are directly transferred onto a flexible polypropylene substrate. Single mode lasing action with effective threshold of 17 mu W is achieved. The robust lasing properties of the device with different bending radii R from infinity to 2.5 mm are obtained. Via finite-element method, we also theoretically address that the lasing wavelength is almost invariant when R> 1.0 mm. This flexible 1D PhC NB laser will be a good candidate for efficient nanolaser in future flexible photonic integrated circuits with ultrahigh component density. (C) 2011 American Institute of Physics. [doi:10.1063/1.3626592]
Square lattice photonic crystal surface mode lasers
(2010-12-06)
Lu, Tsan-Wen
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Lu, Shao-Ping
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Chiu, Li-Hsun
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Lee, Po-Tsung
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光電工程學系
In this report, we propose a square lattice photonic crystal heteroslab-edge microcavity design. In numerical simulations, three surface modes in this microcavity are investigated and optimized by tuning the slab-edge termination tau and gradual mirror layer. High simulated quality (Q) factor of 2.3 x 10(5) and small mode volume of 0.105 mu m(3) are obtained from microcavity with tau = 0.80. In experiments, we obtain and identify different surface modes lasing. The surface mode in the second photonic band gap shows a very-low threshold of 140 mu W and high Q factor of 5,500, which could be an avenue to low-threshold optical lasers and highly sensitive sensor applications with efficient light-matter interactions. c 2010 Optical Society of America