Year: 2018
Type: article
Abstract: We introduce a vertical coupling concept to Fano resonance based terahertz (THz) metamaterials, in order to enhance their modulation characteristics. The approach is demonstrated for an asymmetric split-ring structure fabricated from gold with standard micromachining processes on a fused silica substrate. The realized samples are characterized with THz time-domain spectroscopy and the results are in close agreement with the simulation model. Due to the enhanced field concentration facilitated by vertical coupling, we achieve a 95% modulation depth and 35% resonance frequency tunability at 1.23 THz with less than 1-dB inherent loss. The exemplary device shows vertical coupling as an attractive concept for designing efficient modulators for terahertz imaging applications.
Authors: Tuan Anh Pham Tran, Peter Haring Bolivar
Institution: University of Siegen
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
Funder: Deutsche Forschungsgemeinschaft
OpenAlex ID: W2883104672