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Proceedings Paper

Integrated plasmonic refractive index sensor based on grating/metal film resonant structure
Author(s): Mingze Sun; Tianbo Sun; Youhai Liu; Li Zhu; Fang Liu; Yidong Huang; Connie Chang-Hasnain
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Paper Abstract

Optical biosensors with the high sensitivity is an important tool for environment monitoring, disease diagnosis and drug development. Integrating the biosensor could reduce the size and cost and is desirable for home and outdoor use. However, the integrated structure always results in the worsening of sensitivity and narrowing of sensing range, especially for small molecule sensing. In this work, we propose an integrated plasmonic biosensor based on the resonant structure composed of dielectric grating and metal film. With vertically incident light from the grating side, the surface plasmon polariton (SPP) mode could be excited at certain wavelength and the reflected light would vanish. Simulation results indicate that, when varying refractive index (ndet) of detection layer, the energy of reflected light changes dramatically. Assuming the resolution of the power meter is 0.01dB, the sensing resolution could be 4.37×10-6 RIU, which is very close to the bulk lens based SPP biosensor by monitoring the light intensity variation. Since antibody and antigen always have the size of tens of nanometers, it is necessary to check the sensing ability of the sensor in tens of nanometers. Fixing ndet and varying the thickness of detection layer, calculation result demonstrates that the reflected light energy is sensitive to the thickness change with one hundred nanometers. This attributes to the surface mode property of SPP mode.

Paper Details

Date Published: 15 March 2016
PDF: 6 pages
Proc. SPIE 9757, High Contrast Metastructures V, 97570Q (15 March 2016); doi: 10.1117/12.2218558
Show Author Affiliations
Mingze Sun, Tsinghua Univ. (China)
Tianbo Sun, Univ. of California, Berkeley (United States)
Youhai Liu, Tsinghua Univ. (China)
Li Zhu, Univ. of California, Berkeley (United States)
Fang Liu, Tsinghua Univ. (China)
Yidong Huang, Tsinghua Univ. (China)
Connie Chang-Hasnain, Univ. of California, Berkeley (United States)

Published in SPIE Proceedings Vol. 9757:
High Contrast Metastructures V
Connie J. Chang-Hasnain; David Fattal; Fumio Koyama; Weimin Zhou, Editor(s)

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