標題: Coupled nanowire-based hybrid plasmonic nanocavities on thin substrates
作者: Cheng, Pi-Ju
Chiang, Chih-Kai
Chung, Yi-Cheng
Tien, Chung-Hao
Lin, Tzy-Rong
光電工程學系
Department of Photonics
關鍵字: Laser reonators;Surface plasmons;Semiconductor lasers;Waveguides;Nanowires;Nanomembrane
公開日期: 28-十一月-2014
摘要: We theoretically analyze nanowire-based hybrid plasmonic nanocavities on thin substrates at visible wavelengths. In the presence of thin suspended substrates, the hybrid plasmonic modes, formed by the coupling between a metal nanowire and a dielectric nanowire with optical gain, exhibit negligible substrate-mediated characteristics and overlap better with the gain region. Consequently, the confinement factor of the guided hybrid modes is enhanced by more than 42%. However, the presence of significant mirror loss remains the main challenge to lasing. By adding silver coatings with a sufficient thickness range on the two end facets, we show that the reflectivity is substantially enhanced to above 50%. For a coating thickness of 50 nm and cavity length of about 4 mu m, the quality factor is above 100.
URI: http://dx.doi.org/10.1186/1556-276X-9-641
http://hdl.handle.net/11536/124272
ISSN: 1556-276X
DOI: 10.1186/1556-276X-9-641
期刊: NANOSCALE RESEARCH LETTERS
顯示於類別:期刊論文


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