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Dielectric-Band Photonic Crystal Nanobeam Lasers

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3 Author(s)
Po-Tsung Lee ; Dept. of Photonics, Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Tsan-Wen Lu ; Li-Hsun Chiu

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.

Published in:

Lightwave Technology, Journal of  (Volume:31 ,  Issue: 1 )

Date of Publication:

Jan.1, 2013

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