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Tunable graphene-based infrared reflectance filter having patterned nanoantenna layer and unpatterned graphene layer

United States Patent

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December 29, 2020
View the Complete Patent at the US Patent & Trademark Office
An actively tunable optical filter can control the amplitude of reflected infrared light. The filter exploits the dependence of the excitation energy of plasmons in a continuous and unpatterned sheet of graphene, on the Fermi-level, which can be controlled by conventional electrostatic gating. An exemplary filter enables simultaneous modification of two distinct spectral bands whose positions are dictated by the device geometry and graphene plasmon dispersion. Within these bands, the reflected amplitude can be varied by over 15% and resonance positions can be shifted by over 90 cm.sup.-1. Electromagnetic simulations verify that tuning arises through coupling of incident light to graphene plasmons by a nanoantenna grating structure. Importantly, the tunable range is determined by a combination of graphene properties, device structure, and the surrounding dielectrics, which dictate the plasmon dispersion. Thus, the underlying design is applicable across a broad range of infrared frequencies.
15/ 872,293
January 16, 2018
G02B 1/04 (20060101)G02B 5/26 (20060101)G02B 5/20 (20060101)G01N 21/17 (20060101)G02B 5/00 (20060101)G01N 21/552 (20140101)G02F 1/00 (20060101)B82Y 20/00 (20110101)
STATEMENT OF GOVERNMENT INTEREST This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention.