Abstract
One-dimensional surface-plasmonic nanobeam cavities are proposed as a means to confine surface plasmons to a subwavelength-scale mode volume, while maintaining a relatively high Q-factor. By bonding one-dimensional photonic-crystal nanobeam structures to a low-loss metallic substrate, a clear plasmonic TM bandgap can be formed. The introduction of a single-cell defect alongside the engineering of side-airhole shifts to this plasmonic-crystal nanobeam provides subwavelengthscale plasmonic mode localization within the plasmonic TM bandgap. This suppresses radiation and scattering loss to render a maximum Q-factor of 413 and a modal volume of 3.67 × 10-3 μm3 at room temperature. The possibility of further reduction in the intrinsic loss of the cavity is investigated by lowering the operating temperature and the Q-factor of 1.34 × 104 is predicted at a temperature of 20K for the optimistic case.
Original language | English |
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Pages (from-to) | 11089-11096 |
Number of pages | 8 |
Journal | Optics Express |
Volume | 18 |
Issue number | 11 |
DOIs | |
Publication status | Published - 2010 May 24 |
Externally published | Yes |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics