Wide Angle Dynamically Tunable Enhanced Infrared Absorption on Large-Area Nanopatterned Graphene
| Autor: | Debashis Chanda, Alireza Safaei, Michael N. Leuenberger, Sayan Chandra |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Electron mobility
Materials science Infrared Gate dielectric Physics::Optics General Physics and Astronomy 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention symbols.namesake law General Materials Science Plasmon business.industry Graphene Fermi level General Engineering 021001 nanoscience & nanotechnology Ray 0104 chemical sciences Optical cavity symbols Optoelectronics 0210 nano-technology business |
| Zdroj: | ACS Nano. 13:421-428 |
| ISSN: | 1936-086X 1936-0851 |
| Popis: | Enhancing light-matter interaction by exciting Dirac plasmons on nanopatterned monolayer graphene is an efficient route to achieve high infrared absorption. Here, we designed and fabricated hexagonal planar arrays of nanoholes and nanodisks with and without optical cavity to excite Dirac plasmons on patterned graphene and investigate the role of plasmon lifetime, extinction cross-section, incident light polarization, angle of incident light, and pattern dimensions on the light-absorption spectra. By incorporating a high-k Al2O3 layer as the gate dielectric for dynamic electrostatic tuning of the Fermi level, we demonstrate peak absorptions of 60% and 90% for the nanohole and nanodisk patterns, respectively, in the atmospheric transparent 8–12 μm infrared imaging band with high spectral tunability. Finally, we theoretically and experimentally demonstrate angular dependence of both s- and p-polarized light absorption in monolayer graphene. Our results showcase the practical usability of low carrier mobility... |
| Databáze: | OpenAIRE |
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