Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low-loss integrated photonics for the blue and ultraviolet regime   We present a low-loss integrated photonics platform in the visible and near
ultraviolet regime. Fully-etched waveguides based on atomic layer deposition
(ALD) of aluminum oxide operate in a single transverse mode with $<$3 dB/cm
propagation loss at a wavelength of 371 nm. Ring resonators with intrinsic
quality factors exceeding 470,000 are demonstrated at 405 nm, and the thermo
optic coefficient of ALD aluminum oxide is estimated to be $2.75\times10^{-5}$
[RIU/$^\circ$C]. Absorption loss is sufficiently low to allow on-resonance
operation with intra-cavity powers up to at least 12.5 mW, limited by available
laser power. Experimental and simulated data indicates the propagation loss is
dominated by sidewall roughness, suggesting lower loss in the blue and UV is
achievable.

11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin