Gap induced mode evolution under the asymmetric structure in a plasmonic resonator system

Yong-Pan Gao; Tie-Jun Wang; Cong Cao; Chuan Wang

doi:10.1364/PRJ.5.000113

Journals >Photonics Research >Volume 5 >Issue 2 >Page 113 > Article

Photonics Research
Vol. 5, Issue 2, 113 (2017)

Gap induced mode evolution under the asymmetric structure in a plasmonic resonator system

Yong-Pan Gao¹, Tie-Jun Wang¹, Cong Cao², and Chuan Wang^1、*

Author Affiliations

¹State Key Laboratory of Information Photonics and Optical Communications and School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China

²School of Ethnic Minority Education, Beijing University of Posts and Telecommunications, Beijing 100876, China

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DOI: 10.1364/PRJ.5.000113 Cite this Article Set citation alerts

Yong-Pan Gao, Tie-Jun Wang, Cong Cao, Chuan Wang. Gap induced mode evolution under the asymmetric structure in a plasmonic resonator system[J]. Photonics Research, 2017, 5(2): 113 Copy Citation Text

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Abstract

The modulation of resonance features in microcavities is important to applications in nanophotonics. Based on the asymmetric whispering-gallery modes (WGMs) in a plasmonic resonator, we theoretically studied the mode evolution in an asymmetric WGM plasmonic system. Exploiting the gap or nano-scatter in the plasmonic ring cavity, the symmetry of the system will be broken and the standing wave in the cavity will be tunable. Based on this asymmetric structure, the output coupling rate between the two cavity modes can also be tuned. Moreover, the proposed method could further be applied for sensing and detecting the position of defects in a WGM system.

Keywords

Microcavities Optical resonators Optical sensing and sensors

H = ℏ ω (a_{cw}^{†} a_{cw} + a_{ccw}^{†} a_{ccw}) + ℏ g (a_{ccw}^{†} a_{cw} + a_{cw}^{†} a_{ccw} + a_{cw}^{†} a_{cw} + a_{ccw}^{†} a_{ccw}),

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