Strong THz and Infrared Optical Forces on a Suspended Single-Layer Graphene Sheet
| Autor: | Zheng Wang, S. Hossein Mousavi, Peter T. Rakich |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Materials science
business.industry Terahertz radiation Infrared Graphene Optical force FOS: Physical sciences Physics::Optics Substrate (electronics) Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Optics law Levitation Optoelectronics Electrical and Electronic Engineering business Optomechanics Optics (physics.optics) Physics - Optics Biotechnology Visible spectrum |
| Zdroj: | ACS Photonics. 1:1107-1115 |
| ISSN: | 2330-4022 |
| Popis: | Single-layer graphene exhibits exceptional mechanical properties attractive for optomechanics: it combines low mass density, large tensile modulus, and low bending stiffness. However, at visible wavelengths, graphene absorbs weakly and reflects even less, thereby inadequate to generate large optical forces needed in optomechanics. Here, we numerically show that a single-layer graphene sheet is sufficient to produce strong optical forces under terahertz or infrared illumination. For a system as simple as graphene suspended atop a uniform substrate, high reflectivity from the substrate is crucial in creating a standing-wave pattern, leading to a strong optical force on graphene. This force is readily tunable in amplitude and direction by adjusting the suspension height. In particular, repellent optical forces can levitate graphene to a series of stable equilibrium heights above the substrate. One of the key parameters to maximize the optical force is the excitation frequency: peak forces are found near the scattering frequency of free carriers in graphene. With a dynamically controllable Fermi level, graphene opens up new possibilities of tunable nanoscale optomechanical devices. |
| Databáze: | OpenAIRE |
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