Open AccessHuge field enhancement and high transmittance enabled by terahertz bow-tie aperture arrays: a simulation study
Author(s) -
Xing Zhu,
Shi Zhang,
Huimin Shi,
Mengjie Zheng,
Yasi Wang,
Shuwen Xue,
Jun Quan,
Jun Zhang,
Huigao Duan
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.386076
Subject(s) - terahertz radiation , transmittance , optics , materials science , refractive index , terahertz spectroscopy and technology , aperture (computer memory) , optoelectronics , metamaterial , electric field , terahertz gap , transmission coefficient , wavelength , transmission (telecommunications) , physics , terahertz metamaterials , telecommunications , computer science , far infrared laser , laser , quantum mechanics , acoustics
Sub-wavelength aperture arrays featuring small gaps have an extraordinary significance in enhancing the interactions of terahertz (THz) waves with matters. But it is difficult to obtain large light-substance interaction enhancement and high optical response signal detection capabilities at the same time. Here, we propose a simple terahertz bow-tie aperture arrays structure with a large electric field enhancement factor and high transmittance at the same time. The field enhancement factor can reach a high value of 1.9×10 4 and the transmission coefficient of around 0.8 (the corresponding normalized-to-area transmittance is about 14.3) at 0.04 µm feature gap simultaneously. The systematic simulation results show that the designed structure can enhance the intensity of electromagnetic hotspot by continuously reducing the feature gap size without affecting the intensity of the transmittance. We also visually displayed the significant advantages of extremely strong electromagnetic hot spots in local terahertz refractive index detection, which provides a potential platform and simple strategy for enhanced THz spectral detection.