Figure 2
From: Top-down fabrication of high-uniformity nanodiamonds by self-assembled block copolymer masks
(a) SEM of fabricated NDs before release, featuring ~30 nm sized NDs sitting on ~4 nm diamond pedestals. (b) SEM of NDs released on glass substrate. (c) Particle size distribution histogram of NDs, determined from large scale SEM imaging and subsequent image processing to detect the size of the NDs in the SEM image. The red curve shows a Gaussian fit to the histogram with a mean diameter of 30 nm and a variance of 5.4 nm. (d) Optical confocal scanning image of the NDs released on glass substrate. The bright spot (white dashed circle) indicates an ND hosting a single NV colour centre. (e) Photoluminescence spectrum collected from the bright spot shown in (d), with the characteristic NV zero phonon line (ZPL) at 636.5 nm and a broad phonon sideband. (f) Second-order autocorrelation histogram of the collected emission from the bright spot in (d), showing g2(0) of 0.08 indicating single photon emission (g2(0) < 0.5).
