Electrically tunable metasurface perfect absorbers for ultrathin mid-infrared optical modulators.
By Yuguang Yao, R. Shankar, Mikhail A. Kats, Yi Song, Jing Kong, Marko Loncar, F. Capasso. Nano letters (Print), 2014
747 citations recorded by the source corpus.
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 < λ0/10) high speed (up to 20 GHz) optical modulators over a broad wavelength range (5-7 μm). The operating wavelength can be scaled from the near-infrared to the terahertz by simply tailoring the metasurface and cavity dimensions.
Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/7031e5cea210800e11c5e58381c538cc2a8e2e40
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Citations in the corpus
- Tunable and reconfigurable metasurfaces and metadevices (2018, neutral): “Figure reproduced from: (a–c) ref.(88), American Chemical Society; (d–g) ref.”
- A Reconfigurable Broadband Polarization Converter Based on an Active Metasurface (2018, background): “More recently, reconfigurable metasurface-based devices, including polarization converters, have been extensively studied and successfully designed for microwave and Terahertz regimes [25], [26].”
- A review of metasurfaces: physics and applications (2016, methodology): “nge and an optical modulation depth close to 100% with the latter dened as 1 R min()=R max() where R min() and R max() are the minimum and maximum achievable re ectivity at a certain wavelength [183]. A narrow spectral width is essential for realizing a high modulation depth based on resonance frequ”