Abstract
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 language | English |
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Pages (from-to) | 13479-13491 |
Number of pages | 13 |
Journal | Optics Express |
Volume | 21 |
Issue number | 11 |
DOIs | |
State | Published - 3 Jun 2013 |