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Open AccessArticle

The Sensitivity of Grating-Based SPR Sensors with Wavelength Interrogation

School of Science, Jiangnan University, Wuxi 214122, China
Author to whom correspondence should be addressed.
Sensors 2019, 19(2), 405;
Received: 10 December 2018 / Revised: 11 January 2019 / Accepted: 18 January 2019 / Published: 19 January 2019
(This article belongs to the Special Issue Surface Plasmon Resonance Sensing 2019)
In this paper, we derive the analytical expression for the sensitivity of grating-based surface plasmon resonance (SPR) sensors working in wavelength interrogation. The theoretical analysis shows that the sensitivity increases with increasing wavelength and is saturated beyond a certain wavelength for Au and Ag gratings, while it is almost constant for Al gratings in the wavelength range of 500 to 1000 nm. More importantly, the grating period (P) and the diffraction order (m) dominate the value of sensitivity. Higher sensitivity is possible for SPR sensors with a larger grating period and lower diffraction order. At long wavelengths, a simple expression of P/|m| can be used to estimate the sensor sensitivity. Moreover, we perform experimental measurements of the sensitivity of an SPR sensor based on an Al grating to confirm the theoretical calculations. View Full-Text
Keywords: surface plasmon resonance; metal grating; sensitivity enhancement; biosensor surface plasmon resonance; metal grating; sensitivity enhancement; biosensor
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MDPI and ACS Style

Cao, J.; Sun, Y.; Kong, Y.; Qian, W. The Sensitivity of Grating-Based SPR Sensors with Wavelength Interrogation. Sensors 2019, 19, 405.

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