Plasmonic gap-mode nanocavities with metallic mirrors in high-index cladding

Pi Ju Cheng, Chen Yaweng, Shu Wei Chang, Tzy Rong Lin, Chung-Hao Tien

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


We theoretically analyze plasmonic gap-mode nanocavities covered by a thick cladding layer at telecommunication wavelengths. In the presence of high-index cladding materials such as semiconductors, the first-order hybrid gap mode becomes more promising for lasing than the fundamental one. Still, the significant mirror loss remains the main challenge to lasing. Using silver coatings within a decent thickness range at two end facets, we show that the reflectivity is substantially enhanced above 95 %. At a coating thickness of 50 nm and cavity length of 1.51 mm, the quality factor is about 150, and the threshold gain is lower than 1500 cm-1.

Original languageEnglish
Pages (from-to)13479-13491
Number of pages13
JournalOptics Express
Issue number11
StatePublished - 3 Jun 2013

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