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Enhancement of fluorescence from nitrogen-vacancy center ensemble in bulk diamond with broadband antireflection coatings

Authors :
Ning Zhang
Pengcheng Fan
Mingxin Li
Liu Yuchen
Lixia Xu
Heng Yuan
Guodong Bian
Jixing Zhang
Source :
AIP Advances, Vol 10, Iss 8, Pp 085124-085124-6 (2020)
Publication Year :
2020
Publisher :
AIP Publishing, 2020.

Abstract

The negatively charged nitrogen-vacancy (NV−) center in diamond is a promising platform for quantum sensing. However, fluorescence from the NV− centers suffers large energy loss at the diamond–air interface. Here, we propose a broadband antireflection coating to enhance the fluorescence intensity by simultaneously reducing the energy loss of the excitation laser and the fluorescence. The reflectance for normal-incidence light decreases from nearly 17% for bared diamond to below 0.33% for coated diamond in the wavelength range 500 nm–800 nm. The reflectance averaged over the fluorescence bandwidth is below 3% for angles of incidence less than 20°. The measured emitted fluorescence for the coated diamond is 1.44 times that of uncoated diamond, corresponding to nearly 20% improvement in the measurement sensitivity. The proposed method is significant for enhancing the signal-to-noise ratio of NV−-based sensors.

Details

ISSN :
21583226
Volume :
10
Database :
OpenAIRE
Journal :
AIP Advances
Accession number :
edsair.doi.dedup.....dd790cf7303a866faca892b28c226214