Journal
NANO LETTERS
Volume 14, Issue 11, Pages 6526-6532Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl503104n
Keywords
Metasurface perfect absorbers; electrically tunale; graphene; optical modulators; mid-infrared optoelectonics
Categories
Funding
- Air Force Office of Scientific Research [FA9550-12-1-0289]
- IARPA [N66001-13-1-2007, N66001-13-1-3005]
- NSF [EECS-1028519]
Ask authors/readers for more resources
Dynamically reconfigurable metasurfaces open up unprecedented opportunities in applications such as high capacity communications, dynamic beam shaping, hyperspectral imaging, and adaptive optics. The realization of high performance metasurface-based devices remains a great challenge due to very limited tuning ranges and modulation depths. Here we show that a widely tunable metasurface composed of optical antennas on graphene can be incorporated into a subwavelength-thick optical cavity to create an electrically tunable perfect absorber. By switching the absorber in and out of the critical coupling condition via the gate voltage applied on graphene, a modulation depth of up to 100% can be achieved. In particular, we demonstrated ultrathin (thickness < lambda(0)/10) high speed (up to 20 GHz) optical modulators over a broad wavelength range (5-7 mu m). The operating wavelength can be scaled from the near-infrared to the terahertz by simply tailoring the metasurface and cavity dimensions.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available