Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pushing the Limit of High-Q Mode of a Single Subwavelength Dielectric
  Nanocavity   High index dielectric nanostructure supports different types of resonant
modes. However, it is very challenging to achieve high-Q factor in a single
subwavelength dielectric nanoresonator due to non-hermtian property of the open
system. Here, we present a universal approach of finding out a series of high-Q
resonant modes in a single nonspherical dielectric nanocavity by exploring
quasi-bound state in the continuum. Unlike conventional method relying on heavy
computation (ie, frequency scanning by FDTD), our approach is built upon leaky
mode engineering, through which many high-Q modes can be easily achieved by
constructing avoid-crossing (or crossing) of the eigenvalue for pair leaky
modes. The Q-factor can be up to 2.3*10^4 for square subwavelength nanowire
(NW) (n=4), which is 64 times larger than the highest Q-factor (Q=360) reported
so far in single subwavelength nanodisk. Such high-Q modes can be attributed to
suppressed radiation in the corresponding eigenchannels and simultaneously
quenched electric(magnetic) at momentum space. As a proof of concept, we
experimentally demonstrate the emergence of the high-Q resonant modes (Q=380)
in the scattering spectrum of a single silicon subwavelength nanowire.

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The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: cs