Experimental demonstration of high sensitivity for silver rectangular grating-coupled surface plasmon resonance (SPR) sensing

We experimentally demonstrated a high sensitivity of surface plasmon resonance (SPR) sensor with silver rectangular grating coupling. The reflection spectra of the silver gratings indicated that surface plasmon resonance can be excited by either positive or negative order diffraction of the grating,...

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Bibliographic Details
Published inOptics communications Vol. 416; pp. 66 - 70
Main Authors Dai, Yanqiu, Xu, Huimei, Wang, Haoyu, Lu, Yonghua, Wang, Pei
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.06.2018
Subjects
Diffraction grating
Optical sensing and sensors
Surface plasmons
Diffraction grating
Surface plasmons
Optical sensing and sensors
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Summary:We experimentally demonstrated a high sensitivity of surface plasmon resonance (SPR) sensor with silver rectangular grating coupling. The reflection spectra of the silver gratings indicated that surface plasmon resonance can be excited by either positive or negative order diffraction of the grating, depending on the period of the gratings. Comparing to prism-coupled SPR sensor, the sensitivities are higher for negative order diffraction coupling in bigger coupling angle, but much smaller for positive order diffraction coupling of the gratings. High sensitivity of 254.13 degree/RIU is experimentally realized by grating-based SPR sensor in the negative diffraction excitation mode. Our work paves the way for compact and sensitive SPR sensor in the applications of biochemical and gas sensing.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2018.02.010