Characteristic analysis and comparison of two kinds of hybrid plasmonic annular resonators

Jie Zhou; Feifei Shi; Taojie Zhou; Kebo He; Bocang Qiu; Zhaoyu Zhang

doi:10.1117/1.JNP.11.026006

3 May 2017 Characteristic analysis and comparison of two kinds of hybrid plasmonic annular resonators

Jie Zhou, Feifei Shi, Taojie Zhou, Kebo He, Bocang Qiu, Zhaoyu Zhang

Author Affiliations +

Journal of Nanophotonics, Vol. 11, Issue 2, 026006 (May 2017). https://doi.org/10.1117/1.JNP.11.026006

Abstract

We designed two kinds of hybrid plasmonic annular resonators with different cross-sectional shapes, i.e., a square and circle called “square ring” and “circle ring” resonators, respectively. Both resonators feature an ultracompact mode volume of ∼10−4 μm3 and a relatively high-quality factor of ∼102 at a submicron footprint within our studied wavelength range from 400 to 900 nm. Their performance as defined by the Q/V ratio (quality factor over mode volume) is enhanced considerably with a reduction in their physical dimensions. There exists critical annular radii, which increase from 400 to 600 nm with an increase in the azimuthal numbers from m=7 to m=10, if the two types of rings are compared with the same mode numbers and same ring thickness of 120 nm. Below the critical radii, the circle ring resonator outperforms the square ring resonator in terms of the Q/V ratio, and the difference in Q/V of the two types of rings increases rapidly with the decrease of the radii. On the other hand, they have critical annular radii of ∼250 nm, below which the square ring resonator outperforms the circle ring resonator at the wavelengths of 490 and 595 nm; however, the difference in Q/V of

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Jie Zhou, Feifei Shi, Taojie Zhou, Kebo He, Bocang Qiu, and Zhaoyu Zhang "Characteristic analysis and comparison of two kinds of hybrid plasmonic annular resonators," Journal of Nanophotonics 11(2), 026006 (3 May 2017). https://doi.org/10.1117/1.JNP.11.026006

Received: 25 November 2016; Accepted: 17 April 2017; Published: 3 May 2017

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KEYWORDS

Resonators

Plasmonics

Absorption

Cadmium sulfide

Metals

Dielectrics

Silver

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