Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermally Controllable Multiple High Harmonics Generation by
  Phase-Change Materials-Mediated Fano Clusters   Substantial enhancement of nonlinear high-order harmonics generation based on
Fano-resonant nanostructures has received growing interest due to their
promising potential for developing integrated and advanced next-generation
nanophotonic devices. In this study, going beyond conventional subwavelength
structures, we propose an optothermally functional hetero-metallodielectric
asymmetric eight-member octamer cluster composed of a central silicon nanodisk
and peripheral disks with a phase-change material (Ge2Sb2Te5). Using full
electromagnetic calculations, we show that in the amorphous phase of the
surrounding particles, the oligomer acts as an all-dielectric cluster, while in
the crystalline regime, the octamer turns into a hybrid metallodielectric
assembly. Exploiting the exquisite ability of supporting distinct Fano
lineshapes at different wavelengths depending on the phase of Ge2Sb2Te5, we
showed the generation of both second and third harmonics at amorphous and
crystalline phases of GST nanodisks, respectively with the produced harmonic
wavelengths of 425 nm and 317 nm, respectively. Our calculations for the
corresponding conversion efficiencies revealed significant enhancements as
{\eta}SHG=0.012% and {\eta}THG=0.0081% for SHG and THG, respectively. Such an
exquisite feature of multiresonant optothermally tunable cluster allows
generation of several higher-harmonics with distinct intensities using a single
system for future photonics applications.

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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: math
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The categories of this paper are: astro-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
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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: eess