Quality factor enhancement of plasmonic surface lattice resonance by using asymmetric periods

doi:10.1088/1674-1056/ac1332

Abstract We report that using asymmetric lattice periods can enhance the quality factor of plasmonic surface lattice resonances (SLRs) in two-dimensional array of metal-insulator-metal nanopillars in asymmetric dielectric environment. Simulation results show that by adopting appropriate asymmetric lattice periods, the SLR quality factor can be enhanced by 24% compared with the scenario of symmetric periods. We find that the SLR quality factor is optimized when the resonance wavelength is closest to the Rayleigh cutoff wavelength. We also find that the SLRs effect is polarization sensitive in the proposed structure. We expect this work will advance the engineering of SLRs especially in asymmetric dielectric environments, and will promote their applications in sensing.

Keywords: collective resonance plasmonic nanopillars surface lattice resonance

Received: 18 May 2021
Revised: 04 July 2021
Accepted manuscript online: 12 July 2021

PACS:	42.60.Da	(Resonators, cavities, amplifiers, arrays, and rings)
	78.67.-n	(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
	78.67.Pt	(Multilayers; superlattices; photonic structures; metamaterials)
	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

Fund: Project supported by the State Key Laboratory of Advanced Optical Communication Systems and Networks, China (Grant No. 2019GZKF2).

Corresponding Authors: Degui Sun, Guangyuan Li
E-mail: sundg@cust.edu.cn;gy.li@siat.ac.cn

Cite this article:

Yunjie Shi(石云杰), Lei Xiong(熊磊), Yuming Dong(董玉明), Degui Sun(孙德贵), and Guangyuan Li(李光元) Quality factor enhancement of plasmonic surface lattice resonance by using asymmetric periods 2022 Chin. Phys. B 31 014217

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