Resonant optical transmission through the sub-wavelength air-hole arrays in a gold thin film for sensing applications

3rd International Conference on Manufacturing, Material and Metallurgical Engineering

机械制造;材料科学;冶金学

Chou Chau, Yuan-Fong^1 ; Ming Lim, Chee^1 ; Voo, Nyuk Yoong^1 ; Muslim, Noormariah^1 ; Md Idris, Muhammad Nur Syafi'Ie^1

Centre for Advanced Material and Energy Sciences, Universiti Brunei Darussalam, Tungku Link, Gadong, Negara

BE1410, Brunei^1

关键词: Enhanced transmission;    Environmental media;    Refractive index sensor;    Refractive index units;    Resonant optical transmission;    Resonant transmissions;    Sensing applications;    Transmission spectrums;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/409/1/012011/pdf
DOI  :  10.1088/1757-899X/409/1/012011

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

We have investigated numerically the optical spectral properties of resonant transmission of light through sub-wavelength air-holes in a gold thin film by using the finite element method. The enhanced transmission can be comprehended in the light of interfering surface-wave-like modes propagating in the sub-wavelength air-holes. The effects of geometrical and material properties of the sub-wavelength air-holes in the transmission spectrum were characterized. The proposed structure can be operated as refractive index (RI) sensor with a sensitivity of 524.8 nm/RIU (RIU = refractive index unit) ranging from the visible to the near-infrared. This feature provides a remarkable scheme of nanoscale sensing for the RI variations of the environmental media such as applications in liquid and gas sensing.