中国物理B ›› 2018, Vol. 27 ›› Issue (11): 117302-117302.doi: 10.1088/1674-1056/27/11/117302

所属专题: SPECIAL TOPIC — 80th Anniversary of Northwestern Polytechnical University (NPU)

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇    下一篇

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

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)   

  1. MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an 710072, China
  • 收稿日期:2018-06-21 修回日期:2018-08-07 出版日期:2018-11-05 发布日期:2018-11-05
  • 通讯作者: Hua Lu E-mail:hualu@nwpu.edu.cn
  • 基金资助:

    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).

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

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)   

  1. MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2018-06-21 Revised:2018-08-07 Online:2018-11-05 Published:2018-11-05
  • Contact: Hua Lu E-mail:hualu@nwpu.edu.cn
  • Supported by:

    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).

摘要:

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.

关键词: surface plasmon polaritons, multilayer, optical sensors

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.

Key words: surface plasmon polaritons, multilayer, optical sensors

中图分类号:  (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

  • 73.20.Mf
73.21.Ac (Multilayers) 07.07.Df (Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)