Journal
ACS NANO
Volume 8, Issue 3, Pages 2548-2554Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn406136c
Keywords
terahertz; graphene; metamaterial; optical modulator; time-domain spectroscopy; optoelectronics
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Funding
- EPSRC [EP/K016636/1]
- EPSRC [EP/K016636/1, EP/J017671/1, EP/J007803/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K016636/1, EP/J007803/1, 1208829, EP/J017671/1] Funding Source: researchfish
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Split-ring resonators represent the ideal route to achieve optical control of the incident light at THz frequencies. These subwavelength metamaterial elements exhibit broad resonances that can be easily tuned lithographically. We have realized a design based on the interplay between the resonances of metallic split rings and the electronic properties of monolayer graphene integrated in a single device. By varying the major carrier concentration of graphene, an active modulation of the optical intensity was achieved in the frequency range between 2.2 and 3.1 THz, achieving a maximum modulation depth of 18%, with a bias as low as 0.5 V.
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