Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Crossed chiral band approximation for wideband self-collimation of light   We propose a perspective to the evaluation of the wide bandwidth phenomenon,
by introducing the band tailoring and chiral band approximation on the
self-collimation effect for low-symmetric photonic structures. In the case of
the crossing of the bands, we claim the excitation of the lower mode can
provide the utilization of the entire bandwidth by suppressing the intersection
regions where the frequencies tend to mix. Thereby, we design broadband
self-collimation capable, defect-free photonic structures and examine their
performances. A fractional bandwidth of $0.35$
(${a}\backslash{\lambda}=0.429-0.607$) and $0.37$
(${a}\backslash{\lambda}=0.481-0.701$) are achieved for radii of ${r}=0.25{a}$
and ${r}=0.23{a}$, respectively. We explore the full-range collimation using
transmission and E-field intensity analysis in addition to band diagrams and
group velocity dispersions. Moreover, we indicate all-angle collimation
validity even for highly tilted sources up to an angle of $80^\circ$.

20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an