Fig. 2: Deterministic creation of single-photon colour centres.
From: Laser manufacturing of spatial resolution approaching quantum limit
a PL images of the colour centre patterns of quick response “QR” code, concentric circles, star, the letter “hBN” and “tiger” under the illumination of 450 nm light. The bright colour centres in these patterns were fabricated by single laser pulse with pulse energy Ep about (1 + 5%) Eth0 ≈ 5.2 nJ. b PL image of hBN flakes after laser writing. The laser pulse energy decreases from the top to the bottom (from c, 4.86 nJ to e, 4.68 nJ). c, d Typical spectra of laser-written multiple SPEs and corresponding second-order autocorrelation measurement g2(t). The g2(0) value is marked for each curve. e Typical spectra of laser-written single-photon single-colour centres with low fluorescence background and its second-order autocorrelation measurement g2(t)
