Next Article in Journal
Low-Cost, High-Performance Fiber Optic Fabry–Perot Sensor for Ultrasonic Wave Detection
Next Article in Special Issue
Limits of the Effective Medium Theory in Particle Amplified Surface Plasmon Resonance Spectroscopy Biosensors
Previous Article in Journal
A Fiber Optic Ultrasonic Sensing System for High Temperature Monitoring Using Optically Generated Ultrasonic Waves
Previous Article in Special Issue
An SPR Sensor Chip Based on Peptide-Modified Single-Walled Carbon Nanotubes with Enhanced Sensitivity and Selectivity in the Detection of 2,4,6-Trinitrotoluene Explosives
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; https://doi.org/10.3390/s19020405
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
Show Figures

Figure 1

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.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop