Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A hybrid silicon-sapphire cryogenic Fabry-Perot cavity using hydroxide
  catalysis bonding   The third-generation gravitational wave detectors are under development by
operating the detector in cryogenic temperature to reduce the thermal noise.
Silicon and sapphire are promising candidate materials for the test masses and
suspension elements due to their remarkable mechanical and thermal properties
at cryogenic temperature. Here we present the performances of the cryogenic
thermal cycling and strength testing on hydroxide catalysis bonding between
sapphire and silicon. Our results suggest that although these two materials
have very different coefficients of thermal expansion, but if the flatness and
the thermally grown $\mathrm{SiO_2}$ oxidation layer on the silicon surface are
controlled well, the bonded samples can still survive thermal cycling from room
temperature to 5.5 K. A breaking strength of 3.6$\pm 0.6$ MPa is measured for
the bonds between sapphire and silicon with a 190 nm silicon oxidation
thickness after cooling cycle. We construct a hybrid sapphire-silicon
Fabry-Perot cavity with the developing bonding technique in our lab. The
measurement results reveal that the cavity can survive repeated thermal cycling
while maintaining a good finesse.

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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ph
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: cond-mat