Improving the NV generation efficiency by electron irradiation

Bowen Zhao; Yang Dong; Shaochun Zhang; Xiangdong Chen; Wei Zhu; Fangwen Sun

doi:10.3788/COL202018.080201

Chinese Optics Letters, Volume. 18, Issue 8, 080201(2020)

Improving the NV generation efficiency by electron irradiation

Bowen Zhao^1,2, Yang Dong^1,2、*, Shaochun Zhang^1,2, Xiangdong Chen^1,2, Wei Zhu³, and Fangwen Sun^1,2

Author Affiliations

¹CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China

²CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China

³Hefei National Laboratory for Physical Science at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China

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Figures & Tables(9)

Fig. 1. Magnetic sensing system.

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Fig. 2. PL saturation curves under different electron beam irradiation doses.

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Fig. 3. PL counts with different electron beam irradiation doses and excitation intensities.

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Fig. 4. Spectra of NV color centers with different electron beam irradiation doses.

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Fig. 5. ODMR contrast of the samples with different electron beam irradiation doses.

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Fig. 6. (a) XRD intensity of front side and (b) XRD rocking curves on both sides.

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Table 1. PL Saturations of Different Samples

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Table 1. PL Saturations of Different Samples

Electron Dose ( $\times 10^{16} {cm}^{- 2})$	$I_{sat}$ ( $\times 10^{8} s^{- 1})$	$α$	Enhancement
0	2.07(0.07)	0.03(1)	1.00
1	2.94(0.15)	0.11(1)	1.42
2	8.44(0.51)	0.21(1)	4.01
4	18.30(1.43)	0.46(2)	8.84
8	38.06(2.18)	0.80(4)	18.39
16	44.49(3.77)	0.99(6)	21.49

Table 2. Decoherence Times for Different Samples
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Table 2. Decoherence Times for Different Samples
Electron Dose ( $\times 10^{16} {cm}^{- 2})$ $T_{2}^{*}$ (ns) $T_{2}$ ( $μ s$ ) $T_{1}$ (ms)
0 — 80(4) —
1 310(20) 75(2) 2.6(2)
2 458(21) 73(2) 2.5(2)
4 313(53) 125(5) 3.7(4)
8 447(23) 79(3) 3.5(3)
16 377(60) 77(4) 2.3(4)

Table 3. Magnetic Field Measurement Sensitivity for DC and AC Magnetic Fields

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Table 3. Magnetic Field Measurement Sensitivity for DC and AC Magnetic Fields

Electron Dose ( $\times 10^{16} {cm}^{- 2}$ )	C(%)	$n$	$η_{dc}$ ( $nT / {Hz}^{1 / 2}$ )	$η_{ac}$ ( $nT / {Hz}^{1 / 2}$ )
0	4.7(1)	49.7(2.5)	—	7.59(36)
1	5.5(1)	94.8(4.7)	38.12(1.91)	3.85(16)
2	4.5(1)	229.8(11.5)	24.61(1.13)	3.06(12)
4	3.3(2)	402.9(20.1)	30.67(2.85)	2.41(14)
8	2.8(1)	822.2(41.1)	21.18(1.02)	2.50(14)
16	1.6(1)	929.9(46.5)	38.67(3.09)	4.25(27)

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Bowen Zhao, Yang Dong, Shaochun Zhang, Xiangdong Chen, Wei Zhu, Fangwen Sun, "Improving the NV generation efficiency by electron irradiation," Chin. Opt. Lett. 18, 080201 (2020)

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