Energy conservation and battery life extension are key challenges for the next-generation hybrid electric vehicles. In particular, the temperature and electric currents in a storage battery need to be monitored simultaneously with ∼1 kHz signal bandwidth for optimum battery usage. Here we introduce a centimeter-scale portable quantum sensor head, consisting of a diamond substrate hosting an ensemble of nitrogen-vacancy (NV) color centers with a density of ∼3 × 1017 cm−3. One diamond surface is attached to a multi-mode fiber for simultaneous optical excitation and readout of the NV centers, while the other diamond surface is attached to a coplanar microwave guide for NV spin ground-state mixing. Signal bandwidth of 1 kHz was realized through time-domain multiplexing of the two-tone microwave frequency modulation at 20 kHz. Two microwave frequencies were locked to the two resonance points that were determined from the optically detected magnetic resonance spectrum. From the mean and the difference of the deviation from the two locked frequencies, the temperature and magnetic field were obtained simultaneously and independently, with sensitivities of 3.5 nT/Hz1/2 and 1.3 mK/Hz1/2, respectively. We also showed that our sensor reached a minimum detectable magnetic field of 5 pT by accumulating signals for over 10 000 s.
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18 January 2021
Research Article|
January 22 2021
Simultaneous thermometry and magnetometry using a fiber-coupled quantum diamond sensor
Special Collection:
Ultrawide Bandgap Semiconductors
Yuji Hatano
;
Yuji Hatano
1
Department of Electrical and Electronic Engineering, School of Engineering, Tokyo Institute of Technology
, Meguro, Tokyo 152-8552, Japan
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Jaewon Shin
;
Jaewon Shin
2
YAZAKI Corporation
, Mishuku, Susono, Shizuoka 410-1194, Japan
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Daisuke Nishitani
;
Daisuke Nishitani
1
Department of Electrical and Electronic Engineering, School of Engineering, Tokyo Institute of Technology
, Meguro, Tokyo 152-8552, Japan
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Haruki Iwatsuka
;
Haruki Iwatsuka
1
Department of Electrical and Electronic Engineering, School of Engineering, Tokyo Institute of Technology
, Meguro, Tokyo 152-8552, Japan
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Yuta Masuyama
;
Yuta Masuyama
3
National Institutes for Quantum and Radiological Science and Technology
, Takasaki, Gunma 370-1292, Japan
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Hiroki Sugiyama
;
Hiroki Sugiyama
2
YAZAKI Corporation
, Mishuku, Susono, Shizuoka 410-1194, Japan
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Makoto Ishii
;
Makoto Ishii
2
YAZAKI Corporation
, Mishuku, Susono, Shizuoka 410-1194, Japan
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Shinobu Onoda
;
Shinobu Onoda
3
National Institutes for Quantum and Radiological Science and Technology
, Takasaki, Gunma 370-1292, Japan
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Takeshi Ohshima
;
Takeshi Ohshima
3
National Institutes for Quantum and Radiological Science and Technology
, Takasaki, Gunma 370-1292, Japan
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Keigo Arai
;
Keigo Arai
1
Department of Electrical and Electronic Engineering, School of Engineering, Tokyo Institute of Technology
, Meguro, Tokyo 152-8552, Japan
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Takayuki Iwasaki
;
Takayuki Iwasaki
1
Department of Electrical and Electronic Engineering, School of Engineering, Tokyo Institute of Technology
, Meguro, Tokyo 152-8552, Japan
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Mutsuko Hatano
Mutsuko Hatano
a)
1
Department of Electrical and Electronic Engineering, School of Engineering, Tokyo Institute of Technology
, Meguro, Tokyo 152-8552, Japan
3
National Institutes for Quantum and Radiological Science and Technology
, Takasaki, Gunma 370-1292, Japan
a)Author to whom correspondence should be addressed: hatano.m.ab@m.titech.ac.jp
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a)Author to whom correspondence should be addressed: hatano.m.ab@m.titech.ac.jp
Note: This paper is part of the Special Topic on Ultrawide Bandgap Semiconductors.
Appl. Phys. Lett. 118, 034001 (2021)
Article history
Received:
October 03 2020
Accepted:
January 02 2021
Citation
Yuji Hatano, Jaewon Shin, Daisuke Nishitani, Haruki Iwatsuka, Yuta Masuyama, Hiroki Sugiyama, Makoto Ishii, Shinobu Onoda, Takeshi Ohshima, Keigo Arai, Takayuki Iwasaki, Mutsuko Hatano; Simultaneous thermometry and magnetometry using a fiber-coupled quantum diamond sensor. Appl. Phys. Lett. 18 January 2021; 118 (3): 034001. https://doi.org/10.1063/5.0031502
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