Grating based plasmonic band gap cavities

Date
2009-08
Advisor
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Source Title
Optics Express
Print ISSN
Electronic ISSN
1094-4087
Publisher
Optical Society of American (OSA)
Volume
17
Issue
18
Pages
15541 - 15549
Language
English
Type
Article
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Abstract

We report on a comparative study of grating based plasmonic band gap cavities. Numerically, we calculate the quality factors of the cavities based on three types of grating surfaces; uniform, biharmonic and Moiré surfaces. We show that for biharmonic band gap cavities, the radiation loss can be suppressed by removing the additional grating component in the cavity region. Due to the gradual change of the surface profile in the cavity region, Moiré type surfaces support cavity modes with higher quality factors. Experimentally, we demonstrate the existence of plasmonic cavities based on uniform gratings. Effective index perturbation and cavity geometries are obtained by additional dielectric loading. Quality factor of 85 is obtained from the measured band structure of the cavity. © 2009 Optical Society of America.

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Keywords
Bandpass filters, Energy gap, Plasmons, Band gaps, Bi-harmonic, Cavity geometry, Cavity mode, Cavity regions, Comparative studies, Dielectric loadings, Effective index, Gradual changes, Grating components, Grating surface, Quality factors, Radiation loss, Surface profiles, Q factor measurement
Citation
Published Version (Please cite this version)