Ultra-narrow band sensor based on dielectric array coupling metal substrate in the visible

Shuwen Chu; Huizhen Yuan; Yuzhang Liang; Hao He; Qiang Liu; Wei Peng

doi:10.1117/12.2606929

1 November 2021 Ultra-narrow band sensor based on dielectric array coupling metal substrate in the visible

Shuwen Chu, Huizhen Yuan, Yuzhang Liang, Hao He, Qiang Liu, Wei Peng

Proceedings Volume 12057, Twelfth International Conference on Information Optics and Photonics; 120574E (2021) https://doi.org/10.1117/12.2606929
Event: Twelfth International Conference on Information Optics and Photonics, 2021, Xi'an, China

Abstract

Plasmonic sensors based on metal nanostructure are widely used in the field of sensing due to their feature of remarkable local field strength enhancement. However, the inherent damping of the metal results in wide full width at half maximum (FWHM) of spectrum, which greatly affects the sensing performance. In recent years, the dielectric nanostructure based on low-loss and high refractive index has attracted great interest of researchers. In this paper, we introduce the dielectric nanodisk array structure coupling with metal film to realize ultra-narrow band sensor. The simulation results show that the FWHM of dielectric nanodisks with identical period is reduced by 4 times than the counterpart of Au-disks. Simultaneously, when the thickness of nanodisks is changed, the sensing performances of the dielectric array maintain unchanged, providing the excellent tolerance of preparation. In addition, the structure was prepared experimentally using template transfer technology, and refractive index sensing was carried out. The experimental results are consistent with the simulation. This research provides an effective way towards improving the performance of sensor.

Citation Download Citation

Shuwen Chu, Huizhen Yuan, Yuzhang Liang, Hao He, Qiang Liu, and Wei Peng "Ultra-narrow band sensor based on dielectric array coupling metal substrate in the visible", Proc. SPIE 12057, Twelfth International Conference on Information Optics and Photonics, 120574E (1 November 2021); https://doi.org/10.1117/12.2606929

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KEYWORDS

Dielectrics

Gold

Metals

Reflection

Refractive index

Nanostructures

Sensors

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