Efficient photon-pair generation empowered by dual quasi-bound states in the continuum
arxiv(2024)
摘要
Here we demonstrate the efficient photon-pair generation via spontaneous
parametric down conversion from a semiconductor metasurface supporting dual
quasi-bound states in the continuum (quasi-BICs). In a simple metasurface
design composed of AlGaAs ellipse nano-cyclinders, the two high-Q quasi-BIC
resonances that coincide with the generated signal and idler frequencies
significantly boost the local electric field. This leads to a substantial
enhancement in the reverse classical nonlinear process of sum frequency
generation and subsequently the remarkable high generation rate of photon pairs
under the quantum-classical correspondence principle. Within a narrowband
wavelength regime around the quasi-BIC resonances, the rate of pair production
is enhanced up to ∼10^4 Hz, two orders of magnitude larger than that in
the Mie resonant AlGaAs nanoantennas. Moreover, the photon pair emission is
mainly concentrated in the normal direction with respect to the metasurface,
and shows tunable rate with the Q factor by engineering the rotation angle of
nano-cylinders. The presented work enables nanoscale sources of high-quality
entangled photons which will find applications in advanced quantum imaging and
communications.
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