Tunable graphene-based infrared reflectance filter having patterned nanoantenna layer and unpatterned graphene layer
US10877194B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2018 |
| Grant date | Dec 29, 2020 |
| Priority date | — |
| Expiry date | Apr 8, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
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−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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.