Graphene Based Terahertz Light Modulator in Total Internal Reflection Geometry
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AbstractModulation of visible light has been easily achieved for decades, but modulation of terahertz (THz) light still remains a challenge. To address this issue, the Fresnel equations have been developed to describe a conductive interface in a total internal reflection geometry and reveal a new approach for modulation. To demonstrate this new mechanism, a broadband device achieving a modulation depth greater than 90% between 0.15 and 0.4 THz, and reaching a maximum of 99.3% at 0.24 THz has been designed. The modulation is achieved by applying a gate voltage between -0.1 and 2 V to a graphene layer in a total internal reflection geometry. Compared to conventional designs, the high modulation is realized without assistance from metamaterial structures, resonant cavities, or multistacked graphene layers. Thus, the design is efficient and easy-to-fabricate and can be easily retrofitted to most existing THz systems. This work opens up a new avenue of research as the device has verified the theory and demonstrates how it can be used to make practical devices, bringing a promising new paradigm for THz modulation, thin-film sensing, and noninvasive material characterization.
All Author(s) ListXudong Liu, Zefeng Chen, Edward Parrott, Benjamin Ung, Jianbin Xu, Emma Pickwell-MacPherson
Journal nameAdvanced Optical Materials
Year2017
Month2
Day2
Volume Number5
Issue Number3
PublisherWILEY-V C H VERLAG GMBH
Pages1600697
ISSN2195-1071
LanguagesEnglish-United Kingdom
KeywordsCOHERENT PERFECT ABSORPTION, META-SURFACE, METAMATERIALS, PHOTODETECTORS, SPECTROSCOPY
Web of Science Subject CategoriesMaterials Science, Multidisciplinary;Optics;Materials Science;Optics

Last updated on 2021-17-10 at 00:04