Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultracompact optical circulator based on a uniformly magnetic
  magnetophotonic annular Bragg cavity   We propose a new class of compact integrated optical circulators providing a
large isolation level while maintaining a straightforward technological
feasibility. Their layout is based on a nonreciprocal radial Bragg cavity
composed of concentric magneto-optical rings. The circulator ports are standard
rib waveguides, butt-coupled to the cavity by cutting through its outer rings.
The device is specifically designed for operation in a uniform external
magnetic field. Using a coupled-mode description of the complete
cavity/waveguide-port system, we explore the rich behaviour of cavity
circulators in presence of varying levels of direct port-to-port coupling. We
demonstrate numerically a strongly miniaturized two-dimensional cavity
circulator, with a total footprint of less than $(10\lambda)^2$, achieving a
20-dB isolation level at telecom frequencies over a bandwidth of 130 GHz. The
device is found to be very tolerant with respect to fabrication imperfections.
We finish with an outlook on three-dimensional versions of the proposed
nonreciprocal cavities.

19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin