Wide-bandgap optical materials for high-harmonics generation at the nanoscale
arxiv(2024)
摘要
High-order harmonics generation (HHG) is the only process that enables
table-top-size sources of extreme-ultraviolet (XUV) light. The HHG process
typically involves light interactions with gases or plasma-material phases that
hinder wider adoption of such sources. This motivates the research in HHG from
nanostructured solids. Here we investigate theoretically material platforms for
HHG at the nanoscale using first-principle supercomputer simulations. We reveal
that wide bandgap semiconductors, aluminium nitride AlN and silicon nitride
SiN, are highly promising for XUV light generation when compared to one of the
most common nonlinear nanophotonic material – silicon. In our calculations we
assume excitation with 100 fs pulse duration, 10^13 W/cm^2 peak power and 800
nm central wavelength. We demonstrate that in AlN material the interplay
between the crystal symmetry and the incident light direction and polarization
can enable the generation of both even and odd harmonics. Our results should
advance the developments of high-harmonics generation of XUV light from
nanostructured solids.
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