Extended Data Fig. 4: Schematic of the setup for optical characterizations.
From: Nanophotonic quantum skyrmions enabled by semiconductor cavity quantum electrodynamics
The sample with QDs embedded in Gaussian microcavities is located in a closed-cycle cryostat with a superconducting magnet. The base temperature of the closed-cycle cryostat is 1.8 K. The QDs can be excited by 785 nm continuous wave (CW) or pulsed lasers. The emitted single-photons are collected by a × 50 objective with a numerical aperture of 0.65 and sent to an electron-multiplying charge-coupled device (EMCCD) camera for imaging or coupled to a multimode fiber for spectral analysis, lifetime measurements and Hanbury-Brown-Twiss (HBT) measurements. DM1: 650 nm long-pass dichroic mirror, DM2: 805 nm long-pass dichroic mirror, BPF: band-pass filter, BS: beamsplitter, QWP: quarter-wave plate, HWP: half-wave plate.
