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  Enhancing fluorescence excitation and collection from the nitrogen-vacancy center in diamond through a micro-concave mirror.

Duan, D., Kavatamane, V. K., Arumugam, S. R., Rahane, G., Tzeng, Y. K., Chang, H. C., et al. (2018). Enhancing fluorescence excitation and collection from the nitrogen-vacancy center in diamond through a micro-concave mirror. Applied Physics Letters, 113(4): 041107. doi:10.1063/1.5037807.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-EA15-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-4CF8-1
Genre: Journal Article

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Duan, D.1, Author              
Kavatamane, V. K.1, Author              
Arumugam, S. R.1, Author              
Rahane, G.1, Author              
Tzeng, Y. K., Author
Chang, H. C., Author
Sumiya, H., Author
Onoda, S., Author
Isoya, J., Author
Balasubramanian, G.1, Author              
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1Research Group of Nanoscale Spin Imaging, MPI for Biophysical Chemistry, Max Planck Society, ou_1113579              

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 Abstract: We experimentally demonstrate a simple and robust optical fiber based method to achieve simultaneously efficient excitation and fluorescence collection from Nitrogen-Vacancy (NV) defects containing micro-crystalline diamond. We fabricate a suitable micro-concave mirror that focuses scattered excitation laser light into the diamond located at the focal point of the mirror. At the same instance, the mirror also couples the fluorescence light exiting out of the diamond crystal in the opposite direction of the optical fiber back into the optical fiber within its light acceptance cone. This part of fluorescence would have been otherwise lost from reaching the detector. Our proof-of-principle demonstration achieves a 25 times improvement in fluorescence collection compared to the case of not using any mirrors. The increase in light collection favors getting high signal-to-noise ratio optically detected magnetic resonance signals and hence offers a practical advantage in fiber-based NV quantum sensors. Additionally, we compacted the NV sensor system by replacing some bulky optical elements in the optical path with a I x 2 fiber optical coupler in our optical system. This reduces the complexity of the system and provides portability and robustness needed for applications like magnetic endoscopy and remote-magnetic sensing. Published by AIP Publishing.

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Language(s): eng - English
 Dates: 2018-07-272018-07-23
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1063/1.5037807
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Title: Applied Physics Letters
Source Genre: Journal
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Pages: 5 Volume / Issue: 113 (4) Sequence Number: 041107 Start / End Page: - Identifier: -