Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Flexible terahertz photonic light-cage modules for in-core sensing and
  high temperature applications   Terahertz (THz) technology is a growing and multi-disciplinary research
field, particularly for sensing and telecommunications. A number of THz
waveguides have emerged over the past years, which are set to complement the
capabilities of existing and bulky free space setups. In most designs however,
the guiding region is physically separated from the surroundings, making
interactions between light and the environment inefficient. We present photonic
THz light cages (THzLCs) operating at THz frequencies, consisting of
free-standing dielectric strands, which guide light within a hollow core with
immediate access to the environment. We show the versatility and design
flexibility of this concept, by 3D-printing several cm-length-scale modules
using a single design and four different polymer- and ceramic- materials, which
are either rigid, flexible, or resistant to high temperatures. We characterize
propagation- and bend-losses for straight- and curved- waveguides, which are of
order ~1 dB/cm in the former, and ~2-8 dB/cm in the latter for bend radii below
10 cm, and largely independent of the material. Our transmission experiments
are complemented by near-field measurements at the waveguide output, which
reveal antiresonant guidance for straight THzLCs, and a deformed fundamental
mode in the bent waveguides, in agreement with numerical conformal mapping
simulations. We show that these THzLCs can be used either as: (i) flexible,
reconfigurable, and bendable modular assemblies; (ii) in-core sensors of
structures contained directly inside the hollow core; (iii) high-temperature
sensors, with potential applications in industrial monitoring. These THzLCs are
a novel and useful addition to the growing library of THz waveguides, marrying
the waveguide-like advantages of reconfigurable, diffractionless propagation,
with the free-space-like immediacy of direct exposure to the surrounding
environment.

11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an