Article
Materials Science, Multidisciplinary
Sergei Malykhin, Yuliya Mindarava, Rinat Ismagilov, Fedor Jelezko, Alexander Obraztsov
Summary: In this study, single-crystal diamond needles with micrometer-scale sharp pyramids were successfully produced using a combination of chemical vapor deposition and thermal oxidation processes. Various color centers, such as nitrogen-vacancy (NV), silicon-vacancy (SiV), and germanium-vacancy (GeV), were formed in these needles during plasma enhanced chemical vapor deposition. The luminescent characteristics of the needles were observed, and the mechanisms of impurities introduction into the crystal lattice during the growth process were proposed and verified.
DIAMOND AND RELATED MATERIALS
(2022)
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
Physics, Applied
Dinesh K. Bommidi, Andrea D. Pickel
Summary: Nitrogen vacancy (NV) centers, commonly used for thermometry, show temperature-dependent excited state lifetimes in individual nanodiamonds, which could lead to new approaches for all-optical temperature measurements. Experimental results demonstrate a significant decrease in excited state lifetimes with increasing temperature, providing potential for high-resolution single-ND temperature sensing.
APPLIED PHYSICS LETTERS
(2021)
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
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, 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.
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
Optics
Maryam Zahedian, Jietian T. Liu, Ricardo Vidrio, Shimon Kolkowitz, Jennifer T. T. Choy
Summary: Optically active defects in diamond are commonly used as bright single-photon sources for various quantum applications. Placing these emitters near the diamond surface alters their radiative properties due to the surrounding dielectric environment. The relationship between the emitter's orientation, surface cut direction, and emission characteristics in crystalline solids is crucial to model and understand the effect of dielectric interfaces. This paper presents a framework for analyzing the emission rates and depth-dependent radiative lifetimes of shallow (<100 nm) defects in diamond, which can be extended to other vacancy defects.
LASER & PHOTONICS REVIEWS
(2023)
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
Physics, Applied
Victor I. Kleshch, Vitali Porshyn, Pavel Serbun, Anton S. Orekhov, Rinat R. Ismagilov, Dirk Luetzenkirchen-Hecht, Alexander N. Obraztsov
Summary: Surface graphitization of needlelike diamond nanotips can be achieved by Joule heating, resulting in well-ordered graphene layers and better emission currents, making them promising for various applications.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Nikita Belko, Lena Golubewa, Vyacheslav Chizhevsky, Sopfy Karuseichyk, Dmitry Filimonenko, Marija Jankunec, Hamza Rehman, Tatsiana Kulahava, Polina Kuzhir, Dmitri Mogilevtsev
Summary: This study discusses the fluorescence properties of aggregated ensembles of graphene quantum dots, demonstrating temperature dependence and stochastic emission characteristics. The results show complicated temperature-dependent intermittent emission, indicating a tendency for shorter blinking times with increasing temperature.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Electrochemistry
Katsiaryna Chernyakova, Vitalija Jasulaitiene, Arnas Naujokaitis, Renata Karpicz, Ieva Matulaitiene, Vaclovas Klimas, Arunas Jagminas
Summary: This study investigated the morphology, composition, and fluorescence properties of anodic alumina/carbon composites formed in a formic acid solution with ammonium heptamolybdate additive. The composites exhibited a hierarchical structure with multi-branched pores and a cracked cover layer on the surface. The anodizing process was non-steady, resulting in non-uniform current pathways and the formation of the multi-branched porous structure. The carbon content in the alumina was found to be approximately 5.5%, and it existed in the form of CO2, CO, carboxylate ions, and a-C:H. The fluorescence spectrum of the composites showed wide blue fluorescence with a maximum wavelength of around 455 nm for the surface and 460 nm for the reverse side.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Yaraslau Padrez, Lena Golubewa, Anastasiya Bahdanava, Marija Jankunec, Ieva Matulaitiene, Dmitry Semenov, Renata Karpicz, Tatsiana Kulahava, Yuri Svirko, Polina Kuzhir
Summary: A systematic spectroscopic characterization of highly homogeneous water suspensions of 'buckydiamonds' revealed four types of specific structures on the ND surface that demonstrate excitation-wavelength-dependent photoluminescence (PL). The PL properties of NDs suspensions show concentration-dependent behavior, indicating a tendency for NDs to agglomerate. The pH sensitivity of the 'buckydiamonds' was explored, and it was found that they can serve as all-optical sensors for tiny pH variations in a wide range of pH values.
Article
Physics, Condensed Matter
Ruslan Zonov, Arseniy Fateev, Alexander Obraztsov, Gennady Mikheev
Summary: This study investigates the efficiency of generating unipolar photocurrent pulses in carbon nanowall films when exposed to obliquely incident nanosecond laser pulses. The direction of the wave vector and polarization of the laser radiation have an impact on the generation of photocurrents. The results show that the photocurrents are dependent on the incidence angle and polarization azimuth, with the conversion coefficients changing with the decrease in exciting radiation wavelength.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Physics, Applied
Victor I. Kleshch, Rinat R. Ismagilov, Vsevolod V. Mukhin, Anton S. Orekhov, Philippe Poncharal, Stephen T. Purcell, Alexander N. Obraztsov
Summary: In this paper, the vibrational properties of singly clamped needlelike diamond microcrystallites with nanoscale tips are investigated. It is found that the elastic modulus of these diamond needles is close to that of bulk single crystal diamond. A self-oscillation regime induced by the DC voltage during field emission from the apex of a diamond needle is demonstrated, which can be used for efficient DC-AC conversion in microdevices. The high structural quality of diamond needles, their remarkable mechanical properties, and their relative ease of mass fabrication make them promising candidates for various electromechanical systems, field-emission devices, and scanning probe techniques.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Lena Golubewa, Hamza Rehman, Yaraslau Padrez, Alexey Basharin, Sumit Sumit, Igor Timoshchenko, Renata Karpicz, Yuri Svirko, Polina Kuzhir
Summary: By using a cost-effective room temperature reactive ion etching method, we designed and fabricated the black silicon (bSi) surface profile, which provides the maximum Raman signal enhancement under near-infrared (NIR) excitation when a nanometrically-thin gold layer is deposited. The proposed bSi substrates are reliable, uniform, low cost, and effective for surface enhanced Raman spectroscopy (SERS)-based detection, making these materials essential for medicine, forensics, and environmental monitoring.
