Photonics Research, 2020, 8 (8): 08001289, Published Online: Jul. 14, 2020
Pulse-width-induced polarization enhancement of optically pumped N-V electron spin in diamond 
Download： 747次
Figures & Tables
Fig. 1. Experimental scheme and main result. (a) Experimental setup and a single N-V center in diamond. (b) Electron-spin energy-level of N-V center and the spin dynamics of the pumping process at room temperature. The transition of pumping laser (532 nm) is indicated by the green solid line, while the radiative (nonradiative) transition is the red solid (gray dashed) line. (c) Pulse sequence of the electron-spin Rabi oscillation using repeatedly pulse-width-modulated laser. (d) Effect of pulse-width modulation in electron-spin Rabi oscillation. Blue (red) points are experimental data with 300 ns (4 ns) laser pulses with the pulse sequence shown in (c). The number 33.3% (37.1%) noted in the plot is the contrast value between the m s = 0 m s = − 1 10 10
Fig. 2. Numerical simulations and their corresponding experimental results. (a) For laser pulses with three different widths, the highest polarization that can be achieved in simulation is dependent on the repeating times N t s 10 10 1(c) ] repetitions for signal accumulation.
Fig. 3. Measured Rabi oscillation in terms of spin contrast for (a) different wait time t w 10 10 1(c) ] repetitions for signal accumulation.
Fig. 4. Mechanism and simulation results. (a) The population transfer P 21 P 12 N P i j | i ⟩ | j ⟩ P 21 P 12 | 1 ⟩ | 2 ⟩ | 5 ⟩ | 6 ⟩ t s / ( t s + t w )
Yumeng Song, Yu Tian, Zhiyi Hu, Feifei Zhou, Tengteng Xing, Dawei Lu, Bing Chen, Ya Wang, Nanyang Xu, Jiangfeng Du. Pulse-width-induced polarization enhancement of optically pumped N-V electron spin in diamond[J]. Photonics Research, 2020, 8(8): 08001289.
PDF全文
