Photoinduced Modification of Single-Photon Emitters in Hexagonal Boron Nitride
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- 作者：Zav Shotan ; Harishankar Jayakumar ; Christopher R. Considine ; Mažena Mackoit ; Helmut Fedder ; Jörg Wrachtrup ; Audrius Alkauskas ; Marcus W. Doherty ; Vinod M. Menon ; Carlos A. Meriles
- 刊名：ACS Photonics
- 出版年：2016
- 出版时间：December 21, 2016
- 年：2016
- 卷：3
- 期：12
- 页码：2490-2496
- 全文大小：660K
- ISSN：2330-4022
文摘
Fluorescent defects recently observed under ambient conditions in hexagonal boron nitride (h-BN) promise to open novel opportunities for the implementation of on-chip photonic devices that rely on identical photons from single emitters. Here we report on the room-temperature photoluminescence dynamics of individual emitters in multilayer h-BN flakes exposed to blue laser light. Comparison of optical spectra recorded at successive times reveals considerable spectral diffusion, possibly the result of slowly fluctuating, trapped-carrier-induced Stark shifts. Large spectral jumps—reaching up to 100 nm—followed by bleaching are observed in most cases upon prolonged exposure to blue light, an indication of one-directional photochemical changes possibly taking place on the flake surface. Remarkably, only a fraction of the observed emitters also fluoresce on green illumination, suggesting a more complex optical excitation dynamics than previously anticipated and raising questions on the physical nature of the crystal defect at play.