Sensing Characteristics of Fano Resonance in Y-shaped Gold Nanorods Array

Abstract

Fano resonance of metallic nanostructure is good for reducing the irradiation loss. Fano resonance of metallic nanostructure is also could improve the spectral resolution. Due to its unique sensitivity, Fano resonance is widely used in physics and engineering fields such as optical sensors, optical switches and electromagnetically induced transparent resonators. In this paper, time-domain finite difference method is used to design a kind of Y-type gold periodic nanorods array, which has obvious Fano resonance phenomenon at 1.12-μm wavelength. When the array structural parameters change, the Fano resonance valley has a dramatic movement. The Y-type gold nanoarray structures have better sensing characteristics, and its figure of merit is 10.68. It shows the special nanoarray can be used for infrared sensors.