Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultra-high-Q nanobeam cavity design in Diamond   A novel nanobeam design with a triangular cross-section is proposed. This
design makes possible implementing nanocavities with improved optical
properties. The dependence of a diamond-based cavity quality factor Q and mode
volume Vm on geometry parameter space are studied via 3D FDTD computations. An
ultra-high-Q cavity with Q\aprox 2.51 \times 10^6 and Vm=1.06 \times
({\lambda}/n)^3 is predicted. The mode preferential radiation is upward. The
implications on the potential applications are discussed. The proposed nanobeam
enables fabrication of the cavity without relying on a pre-existing
free-standing diamond membrane as required in most previous approaches.

12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex