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17 August 2014 Highly tunable ultra-narrow-resonances with optical nano-antenna phased arrays in the infrared
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We report our recent development in pursuing high Quality-Factor (high-Q factor) plasmonic resonances, with vertically aligned two dimensional (2-D) periodic nanorod arrays. The 2-D vertically aligned nano-antenna array can have high-Q resonances varying arbitrarily from near infrared to terahertz regime, as the antenna resonances of the nanorod are highly tunable through material properties, the length of the nanorod, and the orthogonal polarization direction with respect to the lattice surface,. The high-Q in combination with the small optical mode volume gives a very high Purcell factor, which could potentially be applied to various enhanced nonlinear photonics or optoelectronic devices. The 'hot spots' around the nanorods can be easily harvested as no index-matching is necessary. The resonances maintain their high-Q factor with the change of the environmental refractive index, which is of great interest for molecular sensing.
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Shi-Qiang Li, Wei Zhou, Peijun Guo, D. Bruce Buchholz, Ziwei Qiu, John B. Ketterson, Leonidas E. Ocola, Kazuaki Sakoda, and Robert P. H. Chang "Highly tunable ultra-narrow-resonances with optical nano-antenna phased arrays in the infrared", Proc. SPIE 9163, Plasmonics: Metallic Nanostructures and Their Optical Properties XII, 91630R (17 August 2014);


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