Figure | Operation principle of the monolithic microcavity-metalens interfaces. (IMAGE)
Caption
Figure | Operation principle of the monolithic microcavity-metalens interfaces. (a) Schematics of the monolithic microcavity-metalens interface. A QD-micropillar single-photon device emits bright and indistinguishable single photons toward its substrate. A metalens on the backside of the chip arbitrarily engineers the photon states of the quantum emission in multiple physical degrees of freedom including radiation divergence, emission directionality, polarization state and OAM. Inset: the XZ plane cross-section of the device. (b) Schematics of the single-photon source on the front side of the chip, consisting of a single QD embedded in the center of a micropillar cavity. The top mirror has 10 more pairs of the DBR than the bottom mirror, which gives rise to the downward photon emission. (c) Numerical simulations of the Purcell factor and the extraction efficiency of the ideal single-photon source. (d) Schematics of the meta-atom acting as a truncated rectangular waveguide to engineer the amplitude and the phase front of the single photons. (e) The calculated transmission and phase shift for meta-atoms with different shapes. (f) Numerical simulation of the single-photon emission to the substrate. (g) Calculated beam divergence of single-photon emission at the output of the micropillar. (h) Numerical simulation of the beam propagation of single photons in the substrate. The beam diameter is expanded from ~2 µm to ~103 µm by propagating through a 350 µm-thickness substrate.
Credit
Yijie Shen et al.
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