標題: Collective Lasing Behavior of Monolithic GaN-InGaN Core-Shell Nanorod Lattice under Room Temperature
作者: Huang, Chia-Yen
Lin, Jing-Jie
Chang, Tsu-Chi
Liu, Che-Yu
Tai, Tzu-Ying
Hong, Kuo-Bin
Lu, Tien-Chang
Kuo, Hao-Chung
光電工程學系
Department of Photonics
關鍵字: Core-shell;InGaN;whisper gallery modes;supermodes;monolithic;collective lasing
公開日期: 1-Oct-2017
摘要: We demonstrated a monolithic GaN-InGaN core-shell nanorod lattice lasing under room temperature. The threshold pumping density was as low as 140 kW/cm(2) with a quality factor as high as 1940. The narrow mode spacing between lasing peaks suggested a strong coupling between adjacent whisper gallery modes (WGM), which was confirmed with the far field patterns. Excitation area dependent photoluminescence revealed that the long-wavelength lasing modes dominated the collective lasing behavior under a large excitation area. The excitation-area-dependent lasing behavior resulted from the prominent optical coupling among rods. According to the optical mode simulations and truncated-rod experiments, we confirmed that the fine-splitting of lasing peaks originated from the coupled supermodes existing in the periodic nanorod lattices. With wavelength-tunable active materials and a wafer-level scalable processing, patterning optically coupled GaN-InGaN core-shell nanorods is a highly practical approach for building various on-chip optical components including emitters and coupled resonator waveguides in visible and ultraviolet spectral range.
URI: http://dx.doi.org/10.1021/acs.nanolett.7b02922
http://hdl.handle.net/11536/143934
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.7b02922
期刊: NANO LETTERS
Volume: 17
起始頁: 6228
結束頁: 6234
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