Guided-mode resonances in flexible 2D terahertz photonic crystals
02 engineering and technology
0210 nano-technology
DOI:
10.1364/optica.388761
Publication Date:
2020-04-02T13:30:09Z
AUTHORS (12)
ABSTRACT
In terahertz (THz) photonics, there is an ongoing effort to develop
thin, compact devices such as dielectric photonic crystal (PhC) slabs
with desirable light–matter interactions. However, previous works in
THz PhC slabs have been limited to rigid substrates with thicknesses
∼
100
s
of micrometers. Dielectric PhC slabs
have been shown to possess in-plane modes that are excited by external
radiation to produce sharp guided-mode resonances with minimal
absorption for applications in sensors, optics, and lasers. Here we
confirm the existence of guided resonances in a membrane-type THz PhC
slab with subwavelength (
λ
0
/
6
−
λ
0
/
12
) thicknesses of flexible dielectric
polyimide films. The transmittance of the guided resonances was
measured for different structural parameters of the unit cell.
Furthermore, we exploited the flexibility of the samples to modulate
the guided modes for a bend angle of
θ
≥
5
∘
, confirmed experimentally by the
suppression of these modes. The mechanical flexibility of the device
allows for an additional degree of freedom in system design for
high-speed communications, soft wearable photonics, and implantable
medical devices.
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