Title: Liquid crystal terahertz photonics with indium tin oxide nanowhiskers and graphene as functional electrodes
Authors: Yang, Chan-Shan
Pan, Ru-Pin
Pan, Ci-Ling
Department of Electrophysics
Keywords: Far infrared or terahertz;phase shift;liquid-crystal devices;spectroscopy;terahertz;transparent conductive coatings
Issue Date: 1-Jan-2015
Abstract: We have constructed and characterized THz phase shifters based on liquid crystals (LCs) with graphene grown by chemical vapor deposition (CVD) and indium-tin-oxide nanowhiskers (ITO NWhs) as transparent conducting electrodes. A graphene-based phase shifter can achieve a phase shift of pi/2 at 1.0 THz with the operating voltage of similar to 2.2 V (rms) as opposed to similar to 5.6 V (rms) for ITO-NWhs-based phase shifter in previous work. On the other hand, 2 pi phase shift at 1.0 THz was achieved in an ITO-NWhs-based phase shifter with a multi-sandwiched structure by applying similar to 2.6 V (rms). The low operation voltage of both two kinds of phase shifters imply compatibility of both type of devices with thin-film transistor (TFT) and complementary metal-oxide-semiconductor (CMOS) technologies. The experimental results of phase shifters are in good agreement with the theoretical predictions.
URI: http://dx.doi.org/10.1117/12.2079324
ISBN: 978-1-62841-474-5
ISSN: 0277-786X
DOI: 10.1117/12.2079324
Volume: 9384
Appears in Collections:Conferences Paper