Giant Terahertz Polarization Rotation in Ultrathin Films of Aligned Carbon Nanotubes
| Autor: | Andrey Baydin, Fuyang Tay, G. Timothy Noe, Saunab Ghosh, Takuma Makihara, Junichiro Kono, Natsumi Komatsu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Terahertz radiation business.industry Physics::Optics FOS: Physical sciences Carbon nanotube Rotation Polarization (waves) Electromagnetic radiation Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention symbols.namesake law Faraday effect Reflection (physics) symbols Optoelectronics Anisotropy business Physics - Optics Optics (physics.optics) |
| DOI: | 10.48550/arxiv.2104.03500 |
| Popis: | For easy manipulation of polarization states of light for applications in communications, imaging, and information processing, an efficient mechanism is desired for rotating light polarization with a minimum interaction length. Here, we report giant polarization rotations for terahertz (THz) electromagnetic waves in ultrathin ( ∼ 45 n m ), high-density films of aligned carbon nanotubes. We observed polarization rotations of up to ∼ 20 ∘ and ∼ 110 ∘ for transmitted and reflected THz pulses, respectively. The amount of polarization rotation was a sensitive function of the angle between the incident THz polarization and the nanotube alignment direction, exhibiting a “magic” angle at which the total rotation through transmission and reflection becomes exactly 90°. Our model quantitatively explains these giant rotations as a result of extremely anisotropic optical constants, demonstrating that aligned carbon nanotubes promise ultrathin, broadband, and tunable THz polarization devices. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|