journal article·2021-03-01Open access

Self-referenced plasmonic biosensor with gold grating on thin gold film

Yue Su, Zhaoxin Geng, Xiaoqing Lv, Weihao Fang, Shicai Wang, Zhengtai Ma, Weihua Pei

AIP Advances· Volume 11· Issue 3

Abstract

Surface plasmon resonance sensors based on grating coupling exhibiting two resonant wavelengths are less observed because usually thick metal films are used. In this paper, we propose gold gratings on a gold film with two narrow reflection dips. One is sensitive to the refractive index (RI) of the cover media with a sensitivity of 720 nm/RIU. However, the other is sensitive to the RI of the substrate, and hence, it can be used as a reference dip. This self-referenced sensor significantly reduces the error contributions of the light intensity fluctuations and temperature variation. Moreover, the electric field is stronger with less decay length than that of gold gratings without gold film. Therefore, gold gratings with a gold film are more suitable to be a biosensor. Besides, we also investigate the structure parameters (the thickness of the gold film, the thickness and width of gold gratings, and the RI of the substrate) on the reflection spectra.
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Research context

OpenAlex topics: Plasmonic and Surface Plasmon Research · Photonic and Optical Devices · Gold and Silver Nanoparticles Synthesis and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Integrated Optoelectronics, Institute of Semiconductors 1 , , Beijing 100083, People’s Republic of China

Chinese Academy of Sciences 1 , , Beijing 100083, People’s Republic of China

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences 2 , Beijing 100049, People’s Republic of China

School of Information Engineering, Minzu University of China 3 , Beijing 100081, People’s Republic of China

State Key Laboratory of Crystal Materials, Shandong University 4 , Jinan 250100, People’s Republic of China

Funding

the National Key P&D Plan · the National Natural Science Foundation of China Youth Science Foundation Project · the National Natural Science Foundation of China · the Key Program of Natural Science Foundation of Beijing · the Opened Fund of the State Key Laboratory of Integrated Optoelectronics · China Postdoctoral Science Foundation · Young and Middle-Aged Talents Program of the State Ethnic Affairs Commission

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