Article
Engineering, Electrical & Electronic
Qimeng Wang, Doudou Zheng, Xinyu Liu, Junzhi Zhao, Yuanyuan Shen, Hao Guo, Zhonghao Li, Jun Tang, Zongmin Ma, Yanjun Li, Jun Liu
Summary: Diamond-based magnetometers using nitrogen-vacancy (NV) centers are promising solid-state sensors, but their spatial range hinders their applications. To address this, we proposed a hybrid magnetometer based on a diamond-based hetero-NV center, which can calculate the magnetic field vector. By inserting NV-doped diamond blocks between permalloy concentrators in a triangular structure, we solved the vector deficiency problem. Real-time variation acquisition of the magnetic field signal was achieved by applying an ac magnetic field and modulation-demodulation methods.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Shunsheng Ye, Huaining Zha, Yifan Xia, Wenhao Dong, Fan Yang, Chenglin Yi, Jing Tao, Xiaoxue Shen, Dong Yang, Zhihong Nie
Summary: This article presents a bottom-up strategy to precisely organize and orient plasmonic molecules on substrates using a combination of directional capillary force and supporting polymer film. The resulting superlattices exhibit highly tunable collective optical properties, making them suitable for advanced plasmonic devices.
Article
Physics, Applied
Yuta Kainuma, Kunitaka Hayashi, Chiyaka Tachioka, Mayumi Ito, Toshiharu Makino, Norikazu Mizuochi, Toshu An
Summary: The study introduces an alternative method for fabricating a scanning NV probe using laser cutting and focused ion beam (FIB) milling. By utilizing a home-built scanning NV magnetometer probe microscopy setup, the study successfully measured optically detected magnetic resonance to detect stray magnetic fields and demonstrated imaging of a magnetic structure with approximately 5-micrometer periodicity. The method offers a higher degree of probe-shape control for scanning NV probes, broadening its application capabilities.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Optics
Qiang Sun, Shuo Li, Taras Plakhotnik, Andrew D. Greentree
Summary: Nanodiamonds with luminescent point defects are widely studied for applications in quantum biosensing. The fluorescence properties vary significantly between particles, even within the same batch. By modeling the emission of nitrogen-vacancy color centers, we found that the fluorescence spectrum depends on the exact position of the emitter within the nanoparticle, with noticeable effects for larger particles. This research provides insight into optimizing nanodiamonds for biosensing applications.
Article
Chemistry, Multidisciplinary
Takamitsu Ishiyama, Toshifumi Imajo, Noriyuki Saitoh, Noriko Yoshizawa, Takashi Suemasu, Kaoru Toko
Summary: The study investigated the effects of amorphous Ge(Sn) precursors on metal-induced lateral crystallization, promoting lateral crystallization by increasing the frequency factor of amorphous Ge. Large Ni-free Ge rods were successfully synthesized at low temperatures, demonstrating three-dimensionally orientation-controlled structures.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Engineering, Electrical & Electronic
John W. Murphy, Clint D. Frye, Roger A. Henderson, Mark A. Stoyer, Lars F. Voss, Rebecca J. Nikolic
Summary: The study demonstrates a high-aspect ratio, three-dimensionally structured betavoltaic device using high-aspect ratio silicon PIN diodes as the semiconductor absorber and (PmCl3)-Pm-147 as the beta emitter. The devices with different Pm-147 activities showed small deviations in output current, primarily attributed to humidity in the experimental room.
JOURNAL OF ELECTRONIC MATERIALS
(2021)
Article
Astronomy & Astrophysics
Pavel N. Mager, Dmitri Yu Klimushkin
Summary: This paper investigates the field line resonance in the magnetosphere model with plasma inhomogeneity, and finds the wave energy can only propagate in a channel with specific eigenfrequencies.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Multidisciplinary Sciences
Yoshiaki Shoji, Ryo Komiyama, Miki Kobayashi, Atsuko Kosaka, Takashi Kajitani, Rie Haruki, Reiji Kumai, Shin-ichi Adachi, Tomofumi Tada, Naoyuki Karasawa, Hiroshi Nakano, Hisao Nakamura, Hidehiro Sakurai, Takanori Fukushima
Summary: Inspired by stacked teacups, we synthesized a hexagonal columnar mesophase with bowl-shaped molecules that exhibit unexpected softness. The combination of higher structural order and mechanical softness could lead to the development of higher-order liquid crystals with unique mechanical and stimuli-responsive properties.
Article
Chemistry, Physical
Makusu Tsutsui, Kazumichi Yokota, Akihide Arima, Takashi Washio, Yoshinobu Baba, Tomoji Kawai
Summary: The authors introduce a method for in situ detection of single-molecule DNA in cells using an electrolysis technique, showcasing its application in single-cell lysis and analysis. They identify specific current signatures that reflect the folding status of DNA, indicating the potential for on-chip single-molecule sequencing and multi-omics analyses in the future.
Article
Materials Science, Ceramics
Sen Chang, Kunjun Wang, Yongguo Li, Jia Wang, Xuemei Song, Zhaochen Zhang, Xin Chen, Jianlu Pei, Yunfeng Shi, Xin'gang Luan
Summary: The sol-gel combined with colloidal crystal template method was used to introduce a three-dimensionally ordered macroporous structure into the silver-silica aerogel, significantly improving the iodine capture capacity.
CERAMICS INTERNATIONAL
(2022)
Article
Optics
Zhonghao Li, Yanling Liang, Chong Shen, Zhenrong Shi, Huanfei Wen, Hao Guo, Zongmin Ma, Jun Tang, Jun Liu
Summary: In this study, wide-field tomography imaging of double circuits was performed using nitrogen-vacancy (NV) center ensembles in a diamond. By employing an inversion model and vector magnetic superposition, the magnetic-field distribution on the surface of the lower layer circuit was obtained. The results provide a simple and highly accurate reference for the detection and fault diagnosis of multilayer and integrated circuits.
Article
Chemistry, Physical
Shailesh Kumar, Cuo Wu, Danylo Komisar, Yinhui Kan, Liudmilla F. Kulikova, Valery A. Davydov, Viatcheslav N. Agafonov, Sergey Bozhevolnyi
Summary: Germanium vacancy (GeV) centers in diamonds are a promising platform for single-photon sources in quantum information technologies. Circular plasmonic Bragg cavities are used to enhance emission from single GeV centers in nanodiamonds, with a decay-rate enhancement of approximately 5.5 confirmed experimentally.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Physics, Applied
Xin Li, Qi Wang, Wei Gao, Ziyang Shi, Hao Guo, Zhengjie Luo, Zhonghao Li, Huanfei Wen, Zongmin Ma, Jun Tang, Jun Liu
Summary: This paper proposes a set of schemes to generate, detect, and identify multi-frequency magnetic fields in the extremely low-frequency range based on quantum sensors. The schemes utilize nitrogen-vacancy centers in diamond as magnetic sensitivity elements and employ closed-loop proportional-integral-differential locking and microwave modulation-demodulation techniques to obtain magnetic field information. By training and identifying with the DenseNet network structure, the recognition rate achieves a high level.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Review
Chemistry, Multidisciplinary
Rui-tang Guo, Xing Hu, Xin Chen, Zhe-xu Bi, Juan Wang, Wei-guo Pan
Summary: In recent years, 3DOM materials have gained significant attention in photocatalysis due to their unique physicochemical properties. The fundamentals and principles of 3DOM photocatalysts are briefly introduced in this review, along with the preparation methods, structure, properties, and their effects on photocatalytic performance. Moreover, the combination of 3DOM materials with various common materials is extensively employed to enhance photocatalytic performance, and the prospects and challenges for the development of 3DOM materials in photocatalysis are discussed.
Article
Multidisciplinary Sciences
J. Diaz, I DeFelipe, M. Ruiz, J. Andres, P. Ayarza, R. Carbonell
Summary: The analysis of background noise in seismic networks is a powerful tool for studying crustal structure and monitoring natural and human-induced processes. This study demonstrates the usefulness of data from controlled source experiments, especially with high-density deployments, in monitoring such processes. Using wide-angle reflection and refraction seismic profile data in the central-northwest part of Iberia, various signals related to aircrafts, road traffic, quarry blasts, wind blow, rainfall, and thunder are identified. Notably, signals generated by a helicopter and an airplane flying parallel to the profile are observed along a 200 km distance with a spatial resolution of 350 m, providing exceptional dataset.
SCIENTIFIC REPORTS
(2022)
Article
Nanoscience & Nanotechnology
Hideaki Takashima, Hironaga Maruya, Keita Ishihara, Toshiyuki Tashima, Konosuke Shimazaki, Andreas W. Schell, Toan Trong Tran, Igor Aharonovich, Shigeki Takeuchi
Article
Physics, Multidisciplinary
Ryo Okamoto, Yuta Tokami, Shigeki Takeuchi
NEW JOURNAL OF PHYSICS
(2020)
Article
Optics
Takayuki Kiyohara, Naoki Yamashiro, Ryo Okamoto, Hirotaka Araki, Jun-Yi Wu, Holger F. Hofmann, Shigeki Takeuchi
Article
Optics
Zhenghao Yin, Kenta Sugiura, Hideaki Takashima, Ryo Okamoto, Feng Qiu, Shiyoshi Yokoyama, Shigeki Takeuchi
Summary: This study reports the generation of frequency correlated photon pairs using a 150-GHz silicon nitride ring cavity, evaluating the joint spectrum intensity of the generated photons and confirming photon pair generation in a total of 42 correlated frequency mode pairs. The experimental results are analyzed and quantified in terms of the phase matching condition.
Article
Physics, Applied
Y. Mukai, M. Arahata, T. Tashima, R. Okamoto, S. Takeuchi
Summary: Utilizing quantum interference, infrared quantum spectroscopy allows the extraction of infrared optical properties through visible photon detection without the need for infrared optical source or detector. The proposed QFTIR method enables determination of complex transmittance and optical constants in a simple setup without dispersive optics. Experimental demonstrations show good agreement with conventional spectrometer results, validating the potential of QFTIR spectroscopy.
PHYSICAL REVIEW APPLIED
(2021)
Article
Optics
Masaya Arahata, Yu Mukai, Bo Cao, Toshiyuki Tashima, Ryo Okamoto, Shigeki Takeuchi
Summary: This study demonstrates wavelength-variable generation of photon pairs through spontaneous parametric downconversion in the visible and mid-infrared regions. By adjusting the phase-matching condition of the nonlinear crystal, signal photons in the range of 600-965 nm and idler photons in the range of 1186-4694 nm are generated. The experiment achieves a pair generation rate of 10^5 s^-1 per mW of pump power, showing potential for applications in heralded MIR single-photon sources and infrared imaging.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Hideaki Takashima, Atsushi Fukuda, Konosuke Shimazaki, Yusuke Iwabata, Hiroki Kawaguchi, Andreas W. Schell, Toshiyuki Tashima, Hiroshi Abe, Shinobu Onoda, Takeshi Ohshima, Shigeki Takeuchi
Summary: Research on creating nanodiamonds with SiV centers via Si ion implantation found that high-temperature annealing treatment can reduce the ZPL linewidth, making it close to that of nanodiamonds synthesized by CVD.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Optics
Bo Cao, Mamoru Hisamitsu, Katsuhiko Tokuda, Sunao Kurimura, Ryo Okamoto, Shigeki Takeuchi
Summary: This study presents a highly efficient photon pair source using chirped quasi-phase-matched devices with a ridge waveguide structure. The chirp rate is a key factor influencing the bandwidth and generation efficiency of photon pairs. Experimental results demonstrate that chirped devices can generate photon pairs with broader bandwidth and stronger frequency correlation.
Article
Materials Science, Multidisciplinary
Konosuke Shimazaki, Hiroki Kawaguchi, Hideaki Takashima, Takuya Fabian Segawa, Frederick T. -K. So, Daiki Terada, Shinobu Onoda, Takeshi Ohshima, Masahiro Shirakawa, Shigeki Takeuchi
Summary: SiV color centers are created in DNDs through annealing treatment in high vacuum up to 1100 degrees C. The precursor of the SiV centers is pristine silicon impurities inside the nanodiamond lattice. Electron irradiated DNDs before annealing show characteristic emission lines of SiV centers.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Frederick T. -K. So, Alexander I. Shames, Daiki Terada, Takuya Genjo, Hiroki Morishita, Izuru Ohki, Takeshi Ohshima, Shinobu Onoda, Hideaki Takashima, Shigeki Takeuchi, Norikazu Mizuochi, Ryuji Igarashi, Masahiro Shirakawa, Takuya F. Segawa
Summary: This study focuses on the formation mechanism of NV- centers in 5 nm detonation nanodiamonds (DNDs) and finds that it is different from high-pressure high-temperature synthesized nanodiamonds. The study also discovers that the NV- concentration in 5 nm DNDs exceeds that of 20 nm-sized nanodiamonds.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Optics
Hideaki Takashima, Andreas W. Schell, Shigeki Takeuchi
Summary: Nanofiber Bragg cavities (NFBCs) can be tuned to a resonance wavelength by applying mechanical tension, and this tunability is important for matching the emission wavelength of single-photon emitters. In this study, the ultra-wide tunability and the limitation of the tuning range of NFBCs were analyzed using 3D finite element method (FEM) and 3D finite-difference time-domain (FDTD) optical simulations. The simulations showed that both the elongation of the grating period and the small shrinkage of the diameter contributed to the ultra-wide tunability of NFBCs.
Article
Nanoscience & Nanotechnology
Mitsuaki Kaneko, Hideaki Takashima, Konosuke Shimazaki, Shigeki Takeuchi, Tsunenobu Kimoto
Summary: This study investigated the impact of oxidation temperature on the formation of single photon-emitting defects at the SiO2/SiC interface. The results showed that the density of interface single photon sources (SPSs) increased with decreasing oxidation temperature for samples cooled in an N-2 ambient, within a range of 10^5 to 10^8 cm^-2. On the other hand, many interface SPSs were formed regardless of the oxidation temperature for samples cooled in an O-2 ambient.
