Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Broad-band robustly single-mode hollow-core PCF by resonant filtering of
  higher order modes   We propose and theoretically analyse a novel hollow-core photonic crystal
fibre (PCF) that is engineered so as to strongly suppress higher order modes,
i.e., to provide robust LP$_{01}$ single-mode guidance in all the wavelength
ranges where the fibre guides with low loss. Encircling the core is a single
ring of non-touching glass elements whose modes are tailored to ensure resonant
phase-matched coupling to higher-order core modes, causing them to leak at a
very high rate into the supporting solid glass sheath. Using a model based on
coupled capillary waveguides, as well as full vectorial finite element
modelling, we show that this modal filtering effect depends on only one
dimensionless geometrical parameter, akin to the well-known $d/{\Lambda}$
parameter for endlessly single-mode solid-core PCF. The design is scalable up
to large core sizes and is predicted to deliver LP$_{01}$ mode losses of some
$10$s of dB/km in multiple transmission windows, the broadest of which spans
more than an octave. At the same time, higher order core modes have losses that
are typically $1000$s of times higher than the LP$_{01}$ mode. The fibre is of
great potential interest in applications such as high-power laser beam
delivery, gas-based nonlinear optics, laser particle delivery, chemical sensing
and laser gyroscopes.

23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat