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Optical Engineering

Terahertz optical modulator based on metamaterial split-ring resonators and graphene
Author(s): Riccardo Degl’Innocenti; David S. Jessop; Yash D. Shah; Juraj Sibik; J. Axel Zeitler; Piran R. Kidambi; Stephan Hofmann; Harvey E. E. Beere; David A. Ritchie
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Paper Abstract

The integration of quantum cascade lasers with devices capable of efficiently manipulating terahertz light represents a fundamental step for many different applications. Split-ring resonators, subwavelength metamaterial elements exhibiting broad resonances that are easily tuned lithographically, represent the ideal route to achieve such optical control of the incident light. We have realized a design based on the interplay between metallic split rings and the electronic properties of a graphene monolayer integrated into a single device. By acting on the doping level of graphene, an active modulation of the optical intensity was achieved in the frequency range between 2.2 and 3.1 THz, with a maximum modulation depth of 18%.

Paper Details

Date Published: 28 May 2014
PDF: 5 pages
Opt. Eng. 53(5) 057108 doi: 10.1117/1.OE.53.5.057108
Published in: Optical Engineering Volume 53, Issue 5
Show Author Affiliations
Riccardo Degl’Innocenti, Univ. of Cambridge (United Kingdom)
David S. Jessop, Univ. of Cambridge (United Kingdom)
Yash D. Shah, Univ. of Cambridge (United Kingdom)
Juraj Sibik, Univ. of Cambridge (United Kingdom)
J. Axel Zeitler, Univ. of Cambridge (United Kingdom)
Piran R. Kidambi, Univ. of Cambridge (United Kingdom)
Stephan Hofmann, Univ. of Cambridge (United Kingdom)
Harvey E. E. Beere, Univ. of Cambridge (United Kingdom)
David A. Ritchie, Univ. of Cambridge (United Kingdom)

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