Enhanced terahertz transmission through a periodic array of tapered rectangular apertures

27th IUPAP Conference on Computational Physics

物理学;计算机科学

Devi, Koijam Monika^1 ; Sarma, Amarendra K.^1 ; Kumar, Gagan^1

Department of Physics, Indian Institute of Technology Guwahati, Guwahati

781039, India^1

关键词: Enhanced transmission;    Field concentrations;    Periodic arrays;    Rectangular aperture;    Rectangular-shaped;    Specific frequencies;    Terahertz transmission;    Thin metal films;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/759/1/012052/pdf
DOI  :  10.1088/1742-6596/759/1/012052

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

We numerically analyze extraordinary terahertz transmission properties of an array of rectangular shaped apertures perforated periodically on a thin metal film. The apertures are tapered at different angles to achieve higher field concentration at the tapered end. The periodic sub-wavelength scale apertures ensure plasmonic behavior giving rise to the enhanced transmission of a specific frequency mode decided by the periodicity. We compare results of transmission with the rectangular shaped apertures of same parameters and observe a significant increase in the transmission. We have compared results of our numerical simulations with theory and have found them consistent.