Fig. 3
From: Arbitrarily structured quantum emission with a multifunctional metalens
Characterisation of hBN SPEs with the polarisation beam-splitting metalens. A A schematic optical setup for the photonic measurement. B PL collected via reflection channel (traditional objective) with a ZPL at ~ 591 nm. Inset, g(2)(τ) confirmed the quantum nature of the SPE. C Emitter dipole orientation, measured from the reflection channel where 0o is the y (vertical) direction. The metalens orientation is set to 90o (red arrow). The emitter dipole orientation (black arrow) of 106o is derived after fitting with a sine function. D PL spectra collected from LPx (red curve) and LPy (blue curve) polarised channels employing the metalens. Insets are corresponding PL raster maps of the emitter. Colour bars in two maps are set to the same for a clear intensity contrast. Scale bars are 1 μm. E–G Cross correlation antibunching measurements from different channels. E Reflection PL and LPx correlation. F Reflection PL and LPy correlation. G LPx and LPy correlation. g(2)(τ) data is background corrected