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Type: 
Journal
Description: 
The spectral response of a terahertz (THz) filter is investigated in detail for different angles of incidence and polarization of the incoming THz wave. The filter is fabricated by patterning an aluminum frequency-selective surface of cross-shaped apertures on a thin foil of the low-loss cyclo-olefin polymer Zeonor. Two different types of resonances are observed, namely, a broadline resonance stemming from the transmittance of the slot apertures and a series of narrowline guided-mode resonances, with the latter being investigated by employing the grating theory. Numerical simulations of the filter transmittance based on the finite-element method agree with experimental measurements by means of THz time domain spectroscopy (THz-TDS). The results reveal extensive possibilities for tuning the guided-mode resonances by mechanically adjusting the incidence or polarization angle, while the fundamental broadline …
Publisher: 
AIP Publishing
Publication date: 
3 Apr 2017
Authors: 

A Ferraro, DC Zografopoulos, R Caputo, R Beccherelli

Biblio References: 
Volume: 110 Issue: 14 Pages: 141107
Origin: 
Applied Physics Letters