Laser & Optoelectronics Progress, Volume. 59, Issue 11, 1105002(2022)
Simulation Analysis of Grating-Assisted Ultra-Narrow Band Multispectral Plasma Resonance Sensing Structure
Full width at half maximum (FWHM) is an important factor affecting the performance of the sensor. In order to improve the quality factor of the surface plasmon resonance sensor, a grating-assisted ultra-narrow band multispectral plasmon resonance sensor structure is proposed in this paper. The structure is composed of periodically alternating SiO2 and Au rectangular nanorods and is placed on the SiO2/Al2O3 thin film layer. The full vector finite element method is used to simulate the optical transmission and sensing characteristics, and the effects of structural parameters and polarization state of incident light on FWHM and sensing characteristics are analyzed. The simulation results show that in the wavelength range of 800-1100 nm, there are two dips formed by plasma resonance and dielectric grating in the transmission spectrum of the structure. The corresponding FWHM can reach 0.35 nm and 0.59 nm, respectively. The refractive index sensitivity is 525.7 nm /RIU and 475.7 nm /RIU, respectively. The figure of merit is 1502.00 RIU-1 and 806.27 RIU-1, respectively, which had potential applications in biological detection, drug screening, membrane biology and other fields.
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Xu Zhong, Tiesheng Wu, Xueyu Wang, Huixian Zhang, Zhihui Liu, Dan Yang, Zuning Yang, Yan Liu, Rui Liu. Simulation Analysis of Grating-Assisted Ultra-Narrow Band Multispectral Plasma Resonance Sensing Structure[J]. Laser & Optoelectronics Progress, 2022, 59(11): 1105002
Category: Diffraction and Gratings
Received: Jul. 29, 2021
Accepted: Sep. 24, 2021
Published Online: Jun. 9, 2022
The Author Email: Wu Tiesheng (tieshengw@163.com), Wang Xueyu (xueyuwang@hotmail.com)