Deterministic nanoassembly of a coupled quantum emitter–photonic crystal cavity system
Click to view
Nanoassembling a coupled single NV center–PC cavity system. (a) Top view and cross section through the center of an S1 cavity showing the simulated intensity profile of the lowest energy mode. (b) SEM overview of the nanopositioning process. From the chip with nanocrystals (below the dashed line), a nanocrystal that contains a single NV center is located using reference markers (lower inset), and subsequently picked up using a sharp tip and transferred to a chip containing PCs (above the dashed line). Top inset: close up of an S1 cavity. (c) SEM picture of a nanocrystal on the tip. (d) SEM picture showing a single NV containing nanocrystal that has been positioned into a hole of an S1 cavity. In [(b)–(d)], shades were added to the tip, the gold marker and the nanocrystals for clarity.
Click to view
Characterization of a coupled NV center–cavity system. (a) Top panel: PL spectrum of a NV center before it was positioned into the nearest air hole of a S1 cavity [see Fig. 1(d)]. Excitation: at 532 nm. Middle panel: Spectrum of the coupled NV center–cavity system. A Fano resonance is observed at the cavity frequency close to the zero phonon line. Inset: Close up of the ZPL and the cavity line. The red line is a fit using a linear background plus a Gaussian and a Fano lineshape to model the shape of the ZPL and cavity line respectively. Excitation: at 568 nm (568 nm laser light induces less background PL than 532 nm). Bottom panel: CP reflection measurement showing the cavity resonance. All measurements were done at room temperature. (b) Measurement of the second-order auto-correlation function of emission within a 615–700 nm bandwidth. Left axis: number of coincidences. Right axis: , corrected for background contribution estimated from APD signals measured next to the NV center (indicated by the dashed line) (Ref. 30). Excitation: at 568 nm (c) Power dependence of the ZPL and Fano amplitude [obtained by a fit as in Fig. 2(a)], and of the integrated spectrum. Solid lines are fits with , where is the excitation power, and , , and are fit parameters. From the fit of the ZPL amplitude, which we assume to contain no background contribution , we extract . The other curves were fit using this value. All curves are normalized to their respective , so that the difference with the ZPL curve indicates the relative background contribution.
Article metrics loading...
Full text loading...