Design and modeling of high-sensitivity plasmon multifunction optical-mechanical sensor based on thin metal grooves

Subject Areas : Journal of New Applied and Computational Findings in Mechanical Systems

vali Pourhossein ¹ , Hamed Saghaei ²

1 - Islamic Azad University of Sari
2 - Islamic Azad University of Shahrekord

Received: 2021-08-24 Accepted : 2021-09-19 Published : 2021-08-23

Keywords: High sensitivity: symmetrical or asymmetrical grooves, Mechanical optical sensor, Plasmonic,

Abstract :

In this paper, a high-sensitivity plasmonic sensor for molecular absorption using symmetric and asymmetric grooves are engraved into thin metal films. The creation of very small grooves with sub-wavelength sizes (nanometers) on a thin metal film leads to a significant increase in the sensitivity associated with molecular absorption. By concentrating light within the grooves, the peak wavelength shift is improved. When the groove is engraved inside the structure, the sensitivity improves to 8.4 times more than the grooveless structure. The sensor functions for plasmonic structures with symmetric and asymmetric grooves have been investigated and it is shown that the proposed sensor is capable of performing biomolecular detection in multiplex form.

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