Article
Optics
Martin Schlederer, Alexandra Mozdzen, Thomas Lompe, Henning Moritz
Summary: A modified scheme is proposed to address the issue of stringent minimization of stray light from the MOT beams, achieving reliable discrimination of up to 17 K-40 atoms with classification fidelities of similar to 98% for up to 5 atom numbers and fidelities of more than 85% for up to 17 atoms.
Article
Optics
Qi-Ming Chen, Fabian Kronowetter, Florian Fesquet, Kedar E. Honasoge, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Summary: The paper proposes a tunable coupler made up of quantum bits that can adjust and amplify interactions between superconducting quantum circuits, achieving single-step switching. The results are expected to not only stimulate interest in collective effects in quantum information processing, but also enable the development of applications in tuning and amplifying interactions in general cavity-QED systems.
Article
Optics
Sandro Heuke, Carla Silva Martins, Remi Andre, Loic Legoff, Herve Rigneault
Summary: Two-photon excited fluorescence (2PEF) microscopy is a popular nonlinear imaging method for biomedical samples. It uses multiple detectors and spectral filter sets to discriminate different fluorophores based on their emission behavior. However, 2PEF suffers from the loss of fluorescence photons outside the filter transmission range and may fail to discriminate fluorophores with similar emission profiles. Here, we propose an alternative 2PEF method that discriminates fluorophores based on their excitation spectra.
Article
Nanoscience & Nanotechnology
Janet E. Sorrells, Rishyashring R. Iyer, Lingxiao Yang, Elisabeth M. Martin, Geng Wang, Haohua Tu, Marina Marjanovic, Stephen A. Boppart
Summary: This paper presents a computational photon counting method using a hybrid photodetector and multithreshold peak detection, which enables faster imaging. By counting instances where photons arrive at the detector within the detector response time, the method accurately characterizes the intensity and fluorescence lifetime of samples.
Article
Spectroscopy
Wenbin Hu, Rui Zhang, Xian-Fu Zhang, Jiatian Liu, Lin Luo
Summary: This study systematically examines the formation of singlet oxygen, excited triplet state, and excited singlet state for halogenated BODIPY photosensitizers in different solvents, and reveals the influence of halogen atoms and solvent on these properties. The heavy atom effect in halogenated BODIPY promotes the formation of the triplet state, while solvent polarity affects the formation of singlet oxygen.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Optics
Timothy M. True, Christopher A. Rice, Glen P. Perram
Summary: Pump modulated laser absorption spectroscopy was used to measure excited state line shapes beginning in the Rb 5P manifold. The lines terminating in the 5D manifold had collisional broadening rates, shift rates, and asymmetry rates, while lines ending in the 7(2)S(1/2) state showed significantly higher rates. The trends observed qualitatively match numerically computed difference potentials.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Chemistry, Applied
Zhen Chen, Chenghu Dai, Qian Zhou, Huitian Du, Jihui Fan, Shenghao Han, Chuang Zhang, Zhiyong Pang
Summary: Exciplex-based TADF materials exhibit excellent optical properties by converting non-radiative states to radiative states, showing potential for nonlinear optical applications.
Article
Optics
Andreas Jechow
Summary: This perspective proposes a setup for heralded two-photon excited fluorescence at the single absorber level and discusses the feasibility of studying with very few photons.
Article
Chemistry, Multidisciplinary
Shen Tong, Jincheng Zhong, Xinlin Chen, Xiangquan Deng, Jie Huang, Yingxian Zhang, Mengyuan Qin, Zhenhui Li, Hui Cheng, Wanjian Zhang, Lei Zheng, Weixin Xie, Ping Qiu, Ke Wang
Summary: Multiphoton microscopy (MPM) is a powerful technique for visualizing deep-brain structures at high resolution. This study demonstrates the measurement technology for the multiphoton excitation and emission properties of fluorescent labels at the 2200 nm window, and successfully applies it to deep-brain vasculature imaging in vivo.
Article
Chemistry, Physical
Yu Wang, Mengtao Sun, Lingyan Meng
Summary: The high-order nonlinearity enables larger signal enhancements in two-photon spectroscopy compared to one-photon spectroscopy, important for conducting photoluminescence measurements at the single molecule level. Theoretical investigation on two-photon-excited fluorescence (2pF) of monolayer MoS2 in various tip-enhanced spectroscopy configurations achieved large enhancement factor on the order of 10^5 by optimizing tip parameters. Calculations of radiative and nonradiative decay rates further elucidated the 2pF emission mechanism.
APPLIED SURFACE SCIENCE
(2022)
Article
Optics
Denis B. Tretyakov, Vasily M. Entin, Ilya I. Beterov, Elena A. Yakshina, Yury Ya. Pechersky, Veniamin G. Gol'dort, Igor I. Ryabtsev
Summary: We present experimental results on the two-photon laser excitation of Rb atoms to Rydberg states, using a homemade 480 nm laser. The resonance line shapes were in good agreement with theory, and we also observed the Autler-Townes splitting of the EIT resonance.
Article
Optics
Jan Schnabel, Tobias Kampschulte, Simon Rupp, Johannes Hecker Denschlag, Andreas Koehn
Summary: Theoretical investigation of photoassociation of Rb-3, focusing on equilibrium structures, spin-orbit effects, and transition dipole moments. Special aspects of trimers including the Jahn-Teller effect are discussed, identifying suitable PA transitions for producing long-lived bound states. Calculations utilize the multireference configuration-interaction method with effective core potential and large basis set.
Article
Optics
Vinay Shukla, Sudip K. Nath, Vaishali Naik, Alok Chakrabarti, Ayan Ray
Summary: This study investigates the non-resonant two photon absorption of hot Rb atoms and the generation of blue fluorescence. The research reveals that blue photon statistics follow a super-Poissonian distribution and modulation amplitude plays a crucial role in extracting a discriminator signal.
JOURNAL OF MODERN OPTICS
(2021)
Article
Materials Science, Multidisciplinary
Takashi Yamada
Summary: The correlation between the photoluminescence properties and excited state dynamics of perylene formed on a graphite substrate at the monolayer limit was investigated. The results reveal that the standing molecular orientation of perylene on the graphite surface leads to the decoupling of the excited states from the substrate, thereby suppressing ultrafast nonradiative decay. The understanding of photoluminescence properties at the organic/electrode interface could be crucial for the development of organic optoelectronic thin-film devices with a few molecular layers.
Article
Biochemistry & Molecular Biology
Sandra Gomez, Esra N. Soysal, Graham A. Worth
Summary: This study presents a complete analysis of the short-time behavior of 4-(dimethylamino)benzonitrile (DMABN) in different environments after excitation to the La state, with a focus on the ring C=C stretching and three methyl tilting modes as responsible motions for the internal conversion. The comparison with ML-MCTDH dynamics on LVC potentials shows similar population decays and nuclear wavepacket evolution, highlighting the importance of the electronic structure level used in influencing ultrafast initial decay in different solvents.
Article
Optics
Orang Alem, Rahul Mhaskar, Ricardo Jimenez-Martinez, Dong Sheng, John LeBlanc, Lutz Trahms, Tilmann Sander, John Kitching, Svenja Knappe
Article
Physics, Multidisciplinary
M. E. Limes, D. Sheng, M. V. Romalis
PHYSICAL REVIEW LETTERS
(2018)
Article
Physics, Multidisciplinary
Samer Afach, Ben C. Buchler, Dmitry Budker, Conner Dailey, Andrei Derevianko, Vincent Dumont, Nataniel L. Figueroa, Ilja Gerhardt, Zoran D. Grujic, Hong Guo, Chuanpeng Hao, Paul S. Hamilton, Morgan Hedges, Derek F. Jackson Kimball, Dongok Kim, Sami Khamis, Thomas Kornack, Victor Lebedev, Zheng-Tian Lu, Hector Masia-Roig, Madeline Monroy, Mikhail Padniuk, Christopher A. Palm, Sun Yool Park, Karun V. Paul, Alexander Penaflor, Xiang Peng, Maxim Pospelov, Rayshaun Preston, Szymon Pustelny, Theo Scholtes, Perrin C. Segura, Yannis K. Semertzidis, Dong Sheng, Yun Chang Shin, Joseph A. Smiga, Jason E. Stalnaker, Ibrahim Sulai, Dhruv Tandon, Tao Wang, Antoine Weis, Arne Wickenbrock, Tatum Wilson, Teng Wu, David Wurm, Wei Xiao, Yucheng Yang, Dongrui Yu, Jianwei Zhang
Summary: The search for transient dark matter in the form of domain walls of axion-like particles found no statistically significant signal, placing constraints on our theoretical understanding of such scenarios. The study used a global network of optical magnetometers to search for patterns of signals consistent with domain walls, but ultimately did not detect any signals of interest. This research contributes valuable experimental constraints to our knowledge of dark matter and axion-like particles.
Article
Physics, Multidisciplinary
Y. -K. Feng, D. -H. Ning, S. -B. Zhang, Z. -T. Lu, D. Sheng
Summary: This study utilized an atomic comagnetometer to experimentally observe the ratio between two xenon isotopes and its correlation with the distance to a nonmagnetic crystal. By improving the upper limit of the coupling strength and excluding a new region, the characteristics of monopole-dipole interactions were further investigated.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Applied
Q. -Q. Yu, S. -Q. Liu, C. -Q. Yuan, D. Sheng
Summary: This paper introduces an atomic-orientation-based single-beam magnetometry scheme to solve the problems of detection dead zones and heading errors induced by light shifts. By using a polarization-reversing and path-bending Herriott cavity with a reflection mirror and half-wave plates, the light-shift effects and unnoticed heading errors can be eliminated.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
Yang Liu, Xiang Peng, Haidong Wang, Bowen Wang, Kaiwen Yi, Dong Sheng, Hong Guo
Summary: In this study, a single-beam nonlinear magneto-optical rotation (NMOR) magnetometer with a multipass 4He gas-discharged cell is proposed. The multipass cell allows laser beams to pass through the atomic ensemble multiple times, increasing the optical path length and enhancing magneto-optical rotation in the 4He gas sample. The magnetometer demonstrates high sensitivity and bandwidth, making it suitable for biomagnetic applications.
Article
Physics, Multidisciplinary
S. -B. Zhang, Z. -L. Ba, D. -H. Ning, N. -F. Zhai, Z. -T. Lu, D. Sheng
Summary: Among the four fundamental forces, only gravity does not couple to particle spins. This principle was tested by searching for an anomalous scalar coupling between the neutron spin and the Earth's gravity on the ground. The results set an upper limit on the coupling energy between the neutron spin and gravity at 5.3 x 10-22 eV (95% confidence level), improving the previous limit by a factor of 17. These results also have implications for constraining other anomalous interactions, such as axion-mediated monopole-dipole interactions.
PHYSICAL REVIEW LETTERS
(2023)
Article
Instruments & Instrumentation
H. Zhou, X. -K. Wang, S. -Q. Liu, L. Cheng, K. Liu, Z. -H. Pan, Y. -R. Li, X. -J. Hao, D. Sheng, Y. -M. Wang
Summary: This paper presents the design of the electronics for a sensitive and stable atomic vector magnetometer used in low-field detections. The electronics need to be reliable and sophisticated for signal processing, as well as compact and low-cost for miniaturization. The paper also proposes a robust method to eliminate interferences caused by harmonics of modulation fields through frequency selection. Experimental results validate the performance of the electronics and the frequency-selection scheme.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Physics, Applied
S-Q. Liu, Q-Q. Yu, H. Zhou, D. Sheng
Summary: This paper presents a compact low-temperature atomic vector magnetometer for weak-field measurements, using an atomic cell containing two orthogonal multipass cavities. The magnetic field sensitivities at all three axes are better than 45 fT Hz(-1/2) at 10 Hz limited by photon noise, and 85 fT Hz(-1/2) at 0.1 Hz, at a working temperature of 75 degrees C. The sensor also shows measurement stabilities better than 1.5 pT at three axes for an integration time of 10(4) s, even with the laser frequency unlocked. The magnetometer is an important step towards long-term stable measurements and calibrations of ultralow fields.
PHYSICAL REVIEW APPLIED
(2023)
Article
Optics
Q. -Q Yu, S. -Q Liu, X. -K Wang, D. Sheng
Summary: Magnetic gradiometers are widely used in practical and academic applications, with total field gradient and field gradient tensor being important observables. However, previous research on atomic magnetic gradiometers has not focused on measuring the field gradient tensor. In this study, we develop an atomic magnetic gradiometer based on two separately optically pumped atomic ensembles in a Herriott-cavity-assisted atomic cell. This gradiometer exhibits versatile operation modes and functions, and we demonstrate its ability to measure both types of field gradient observables.
Article
Optics
C-P Hao, Q-Q Yu, C-Q Yuan, S-Q Liu, D. Sheng
Summary: This paper presents a Herriott-cavity-assisted closed-loop Xe isotope gas comagnetometer that utilizes a passive method to improve system stability and sensitivity. The system has wide applications in precision measurements.
Article
Optics
Y-K Feng, S-B Zhang, Z-T Lu, D. Sheng
Article
Optics
B. Cai, C-P Hao, Z-R Qiu, Q-Q Yu, W. Xiao, D. Sheng
Article
Optics
C-P Hao, Z-R Qiu, Q. Sun, Y. Zhu, D. Sheng
Article
Physics, Applied
D. Sheng, A. R. Perry, S. P. Krzyzewski, S. Geller, J. Kitching, S. Knappe
APPLIED PHYSICS LETTERS
(2017)
