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Periodical elements made by stacking thin layers of the cyclo-olefin polymer Zeonor, separated by spacers made of bi-adhesive tape, are used as building blocks for realizing tunable terahertz (THz) filters. The basic block is a Bragg reflector whose bandgap can be controlled by changing the geometrical features of the periodical elements. By combining two of these Bragg building blocks, separated by a void defect cavity, a tunable bandpass filter is obtained. The thickness of the defect cavity is mechanically tuned by means of a translation stage. The resulting filter are mechanically stable and they show both high transmittance and narrow linewidths, owing to the selected THz low-loss polymer.
Publication date: 
16 Aug 2016

Antonio Ferraro, Dimitrios C Zografopoulos, Roberto Caputo, Romeo Beccherelli

Biblio References: 
Volume: 28 Issue: 21 Pages: 2459-2462
IEEE Photonics Technology Letters