Giant terahertz polarization rotation in ultrathin films of aligned carbon nanotubes
FOS: Physical sciences
02 engineering and technology
0210 nano-technology
Physics - Optics
Optics (physics.optics)
DOI:
10.1364/optica.422826
Publication Date:
2021-04-19T11:02:46Z
AUTHORS (7)
ABSTRACT
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.
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