Article
Optics
Masanori Fujiwara, Shunsuke Inoue, Shin-ichiro Masuno, Haining Fu, Shigeki Tokita, Masaki Hashida, Norikazu Mizuochi
Summary: Recently, the creation of nitrogen-vacancy (NV) centers using ultrashort laser processing has gained attention for quantum information devices. This study demonstrates the creation of high-density NV centers in a wide region using a single intense femtosecond laser pulse, which is important for quantum sensing applications. The technique allows for the expansion of the region containing NV centers and has the potential to fabricate ultrahigh-sensitivity quantum sensors.
Article
Multidisciplinary Sciences
Alexander Savvin, Alexander Dormidonov, Evgeniya Smetanina, Vladimir Mitrokhin, Evgeniy Lipatov, Dmitriy Genin, Sergey Potanin, Alexander Yelisseyev, Viktor Vins
Summary: The authors successfully demonstrated lasing in (NV-) centers in diamond, achieving improved laser efficiency by fine-tuning the pump conditions to reduce photoionization. Investigation into lasing conditions and gain saturation was conducted under high-power laser pulse pumping of diamond crystal.
NATURE COMMUNICATIONS
(2021)
Article
Optics
D. B. Radishev, M. A. Lobaev, S. A. Bogdanov, A. M. Gorbachev, A. L. Vikharev, M. N. Drozdov
Summary: Co-doping with nitrogen and phosphorus allows NV centers in diamond to predominantly exist in the NV- state and stabilize it under high excitation laser power. Cooling with liquid nitrogen further increases the fraction of the NV- state, which may be beneficial for optimizing the sensitivity of magnetometers.
JOURNAL OF LUMINESCENCE
(2021)
Article
Materials Science, Multidisciplinary
Qing Ai, Peng-Bo Li, Wei Qin, Jie-Xing Zhao, C. P. Sun, Franco Nori
Summary: This study demonstrates that nitrogen-vacancy (NV) centers in diamond can produce a unique quantum hyperbolic metamaterial, with a hyperbolic dispersion relation that can be engineered and dynamically tuned by applying a magnetic field. This quantum hyperbolic metamaterial allows for negative refraction and can be used for subwavelength imaging, spontaneous emission enhancement, and other applications in various fields.
Article
Materials Science, Multidisciplinary
O. R. Rubinas, V. V. Soshenko, S. Bolshedvorskii, A. Zeleneev, A. S. Galkin, S. A. Tarelkin, S. Y. Troschiev, V. V. Vorobyov, V. N. Sorokin, A. A. Sukhanov, V. G. Vins, A. N. Smolyaninov, A. Akimov
Summary: The research shows that by optimizing the electron irradiation dose in postprocessing procedures, the increased dephasing of nitrogen-vacancy color centers in diamond can be efficiently compensated for, thus extending the range of possible useful concentrations of NV centers in diamonds with natural carbon content.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Physical
A. Watanabe, T. Nishikawa, H. Kato, M. Fujie, M. Fujiwara, T. Makino, S. Yamasaki, E. D. Herbschleb, N. Mizuochi
Summary: The study focuses on the spin and optical properties of NV centers in phosphorus-doped n-type diamond, demonstrating an extension of spin-coherence time, stabilization of charge state, and improvement of creation yield at a depth of approximately 15 nm. The longest T-2 of about 580 μs for shallow NV centers approaches the limit in bulk diamond, limited by the nuclear spins of natural abundant C-13.
Article
Physics, Applied
Chikara Shinei, Masashi Miyakawa, Shuya Ishii, Seiichi Saiki, Shinobu Onoda, Takashi Taniguchi, Takeshi Ohshima, Tokuyuki Teraji
Summary: The charge states of NV centers in diamond single crystals were investigated based on concentrations of neutral substitutional nitrogen (N-s(0)) and NVT centers. It was found that NV centers were fully negatively charged when the ratio of NVT to N-s(0) was 1%-20%, and NV0 centers appeared gradually when the ratio exceeded 20%-30%.The concentration ratio between NV- centers and NV0 centers was described using an equilibrium equation.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Lena Golubewa, Yaraslau Padrez, Sergei Malykhin, Tatsiana Kulahava, Ekaterina Shamova, Igor Timoshchenko, Marius Franckevicius, Algirdas Selskis, Renata Karpicz, Alexander Obraztsov, Yuri Svirko, Polina Kuzhir
Summary: This study demonstrates all-optical in vitro temperature monitoring in the physiologically significant range using biocompatible diamond microneedles enriched with NV/SiV color centers. The simultaneous detection of NV and SiV fluorescence enables two-band visualization of living cells combined with temperature sensing. The results show that temperature can be measured by SiV ZPL characteristics and accuracy can be improved by normalizing the PL signal.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Optics
Zong-Da Zhang, Si-Yu Yin, Li-Cheng Wang, Ying-De Wang, Yun-Fei Li, Zhen-Nan Tian, Qi-Dai Chen
Summary: An array of single NV centers was prepared using the femtosecond laser direct writing method to address the accuracy and consistency issues in static magnetic field detection. The prepared NV centers have fewer defects and good stress uniformity, with an average spatial positioning error of only 0.2 μm. This array enables high accuracy measurement of magnetic field vector and gradient.
Article
Optics
Y. Shimotsuma, K. Kinouchi, R. Yanoshita, M. Fujiwara, N. Mizuochi, M. Uemoto, M. Shimizu, K. Miura
Summary: The NV centers in a diamond were successfully created using a femtosecond laser single pulse. The effect of different laser pulse widths on the diamond lattice was investigated both experimentally and theoretically. Interestingly, despite the high thermal conductivity of a diamond, a suitable pulse repetition rate of several tens kHz was found for the formation of NV center ensembles by femtosecond laser pulse irradiation.
Article
Materials Science, Multidisciplinary
Wei Zhao, Zongwei Xu, Fei Ren, Bing Dong, Junlei Zhao, Pengfei Wang
Summary: The yield of nitrogen-vacancy (NV) color centers at the nanoscale was improved through molecular dynamics simulation and experiments. The most appropriate conditions for NV color center formation were determined, and the effect of high-temperature annealing on different types of NV color centers for various applications was analyzed. The changes inside the substrate under high fluence implantation were also examined.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Chemistry, Physical
Marie Kempkes, Tobias Zier, Kilian Singer, Martin E. Garcia
Summary: NV color centers in diamond exhibit various interesting properties suitable for technological applications like quantum sensing, secure message encryption, and biological imaging, and can also act as qubits. Utilizing femtosecond-laser pulses to induce NV center formation in diamond can modify interatomic bonding properties and lead to the attraction and formation of NV centers between vacancy and nitrogen impurity.
Article
Materials Science, Multidisciplinary
W. Pfaffle, D. Antonov, J. Wrachtrup, G. Bester
Summary: The computational approach presented in this study, based on density functional theory and screened configuration interaction, is capable of accurately treating highly correlated electron spins localized around semiconductor defects. It is computationally not more demanding than a usual density functional theory calculation, making it suitable for calculating isolated defects or defect complexes. This approach has been successfully applied to the nitrogen vacancy defect in diamond with very good agreement with experimental results.
Article
Chemistry, Physical
Hiroki Takehana, Ichiro Yamane, Takashi Yanase, Taro Nagahama, Toshihiro Shimada
Summary: Different alkali metals (Li, Na, K) react with single crystal diamond particles at different temperatures and have varying effects on the surface morphology. Li reacts the fastest, Na makes the surface rougher, and K has minimal impact. The photoluminescence of the NV-center is only affected after annealing with K, in accordance with band bending behavior.
Article
Chemistry, Analytical
Zhiming Li, Zhonghao Li, Zhenrong Shi, Hao Zhang, Yanling Liang, Jun Tang
Summary: This paper presents a hollow omega-type antenna design for diamond nitrogen-vacancy (NV) ensemble color center imaging, which provides high-efficiency, large-bandwidth, and uniform magnetic field radiation. Compared with a straight copper antenna, the proposed antenna has significantly higher radiation efficiency and bandwidth, demonstrating its effectiveness for achieving high-precision wide-field imaging.
