Coupling-induced spectral splitting for plasmonic sensing with ultra-high figure of merit

doi:10.1088/1674-1056/27/11/117302

Abstract

We investigate a kind of spectral splitting effect in a plasmonic multilayer system, which consists of stacked Al₂O₃ and SiO₂ layers, a thin metal film, and a dielectric prism substrate. The results illustrate that an obvious peak appears in the center of the surface plasmon resonance (SPR)-induced reflection spectral dip in the structure with the SiO₂/Al₂O₃/SiO₂ layers. This spectral splitting response can be regarded as an electromagnetically induced transparency (EIT) like effect, which is attributed to the coupling and interference between the SPR on the metal film and guided-mode resonance (GMR) in the Al₂O₃ layer. The theoretical calculations agree well with the numerical simulations. It is also found that the reflection spectrum will be further split by the introduction of another Al₂O₃ layer into the multilayer structure. The reintroduced GMR in the Al₂O₃ layer changes the coupling and interference process between the SPR and GMR field, giving rise to the generation of ultra-narrow reflection dip. Especially, the spectral splitting can facilitate the realization of plasmonic sensors with ultra-high figure of merit (583), which is about 5 times larger than that of traditional SPR sensors. These results will provide a new avenue to the light field manipulation and optical functionalities, especially biochemical and environmental sensing.

Keywords: surface plasmon polaritons multilayer optical sensors

Received: 21 June 2018
Revised: 07 August 2018
Accepted manuscript online:

PACS:	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
	73.21.Ac	(Multilayers)
	07.07.Df	(Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)

Fund:

Project supported by the National Key R&D Program of China (Grant No. 2017YFA0303800), the National Natural Science Foundation of China (Grant Nos. 61705186, 11634010, and 11774290), the Natural Science Basic Research Plan in Shaanxi Province, China (Grant No. 2017JQ1023), the Technology Foundation for Selected Overseas Chinese Scholar of Shaanxi Province, China (Grant No. 2017007), and the Fundamental Research Funds for the Central Universities, China (Grant Nos. 3102018zy039 and 3102018zy050).

Corresponding Authors: Hua Lu
E-mail: hualu@nwpu.edu.cn

Cite this article:

Hua Lu(陆华), Yi-Cun Fan(范奕村), Si-Qing Dai(戴思清), Dong Mao(毛东), Fa-Jun Xiao(肖发俊), Peng Li(李鹏), Jian-Lin Zhao(赵建林) Coupling-induced spectral splitting for plasmonic sensing with ultra-high figure of merit 2018 Chin. Phys. B 27 117302

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