Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quasi Bound States in the Continuum with Few Unit Cells of Photonic
  Crystal Slab   Bound states in the continuum (BICs) in photonic crystal slabs represent the
resonances with an infinite quality(Q)-factor, occurring above the light line
for an infinitely periodic structure. We show that a set of BICs can turn into
quasi-BICs with a very high Q-factor even for two or three unit cell
structures. They are explained by a viewpoint of BICs originating from the
tight binding of individual resonances of each unit cell as in semiconductors.
Combined with a reciprocal-space matching technique, the microcavities based on
quasi-BICs can achieve a Q-factor as high as defect-based PhC microcavities.
These results may enable experimental studies of BICs in a compact platform as
well as realizing a new concept of high-Q mirrorless microcavities.

22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin