Metal mesh filters based on Ti, ITO and Cu thin films for terahertz waves
OPTICAL AND QUANTUM ELECTRONICS, vol.48, no.2, 2016 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 48 Issue: 2
- Publication Date: 2016
- Doi Number: 10.1007/s11082-016-0427-z
- Journal Name: OPTICAL AND QUANTUM ELECTRONICS
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Keywords: Terahertz radiation, Metal mesh filters, Frequency selective surfaces, Bandpass filters, Thin film fabrication, EXTRAORDINARY OPTICAL-TRANSMISSION, BANDPASS-FILTERS, EMISSION
- Middle East Technical University Northern Cyprus Campus Affiliated: Yes
Abstract
In this study, we have investigated the spectral performance of resonant terahertz (THz) bandpass filters which were produced from thin films with a metal-mesh shape. The aforementioned filters were fabricated from titanium, copper and indium tin oxide thin films on fused silica substrates by UV lithography with an array of cross-shaped apertures. Since the mesh period, cross-arm length and its width specify the spectral characteristics of the filters, we were able to reveal the performance of these filters experimentally using both a THz time domain spectrometer and a Fourier transform infrared spectrometer. A commercial electromagnetic simulation software, CST microwave studio, was used to verify the experimental data. The transmission of the filters are in the range 20-55 % at their relevant center frequencies. To our knowledge this study is the first to show that fabricated patterns based on ITO thin films can be used to filter THz radiation.