Article
Optics
Chene Tradonsky, Simon Mahler, Gaodi Cai, Vishwa Pal, Ronen Chriki, Asher A. Friesem, Nir Davidson
Summary: The method involves a digital degenerate cavity laser, phase-only spatial light modulator, and spatial filters to control the intensity, phase, and coherence distributions of laser beams. It can generate high-resolution arbitrary shaped laser beams with minimal change in output power by reshaping the beams efficiently through free space propagation.
Article
Engineering, Electrical & Electronic
Wenxiu Hou, Chao Tan, Hao Wu, Feng Dong
Summary: Ultrasound tomography (UT) is proposed as an emerging technique for measuring phase distribution in industrial multiphase flow monitoring. The proposed multimode UT combines ultrasound transmission and reflection modes for measuring stratified phase distribution and sound speed of liquid-solid mixtures in horizontal pipes. The proposed method effectively reconstructs the phase distribution of multiphase media according to numerical investigations and experimental results, with minimum relative error (RE) and maximum correlation coefficient (CC) reaching 0.33 and 0.94, respectively, and an average measurement error (ME) of 3.80% for layer height.
IEEE SENSORS JOURNAL
(2023)
Article
Optics
Ksenia Abrashitova, Lyubov V. Amitonova
Summary: Light is used as a tool for various metrology applications and fiber probes are widely used to deliver light to hard-to-reach places. The integration of optical metrology into a flexible fiber probe has resulted in the development of a multimode fiber ruler for detecting nanometric displacements. The ruler demonstrates high resolving power and does not require detailed field mapping or special structures.
Article
Optics
Henry Haig, Nicholas Bender, Yishai Eisenberg, Frank Wise
Summary: This paper presents a technique for single-mode operation of highly multimode fiber based on regenerative amplification. The technique enables the generation of short-pulse fiber sources with high gain, negligible amplified spontaneous emission, high pulse energy, good beam quality, and transform-limited pulses from a single amplification stage.
Article
Multidisciplinary Sciences
Xiangyan Meng, Guojie Zhang, Nuannuan Shi, Guangyi Li, Jose Azana, Jose Capmany, Jianping Yao, Yichen Shen, Wei Li, Ninghua Zhu, Ming Li
Summary: Convolutional neural networks are facing limitations in processing massive data due to electrical frequency and memory access time. Optical computing offers faster processing speeds and higher energy efficiency, but current schemes lack scalability. In this study, a compact on-chip optical convolutional processing unit is demonstrated on a low-loss silicon nitride platform, showing potential for large-scale integration.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Benjamin Lochocki, Max V. Verweg, Jeroen J. M. Hoozemans, Johannes F. de Boer, Lyubov V. Amitonova
Summary: This study demonstrates high-resolution imaging of subcellular structures in the living brain using a single multimode fiber probe and advanced wavefront engineering techniques. The application of raster-scan imaging and speckle-based compressive imaging significantly reduces acquisition time while maintaining high spatial resolution. The accumulation of age-related pigment lipofuscin in Alzheimer's disease human brain has been successfully visualized with improved speed.
Article
Multidisciplinary Sciences
Jarrett H. Vella, Lifeng Huang, Naresh Eedugurala, Kevin S. Mayer, Tse Nga Ng, Jason D. Azoulay
Summary: This research presents a new platform for infrared optoelectronics using a donor-acceptor conjugated polymer, which enables high-performance infrared photodetection with wide spectral range, operation at room temperature, and excellent detectivity. This offers a promising solution for low-cost infrared optoelectronics.
Article
Optics
Michal Lipka, Michal Parniak
Summary: Hyperentangled photonic states, which exhibit nonclassical correlations in multiple degrees of freedom, offer enhanced performance for quantum optical communication and computation schemes. Experimental characterization of such states remains challenging, requiring high spatial resolution single-photon detection and a suitable mode converter to observe the spectral-temporal degree of freedom. Researchers have successfully demonstrated the measurement of full four-dimensional transverse-wave-vector-spectral correlations between pairs of photons generated in noncollinear spontaneous parametric downconversion.
Article
Robotics
Joran W. Booth, Olivier Cyr-Choiniere, Jennifer C. Case, Dylan Shah, Michelle C. Yuen, Rebecca Kramer-Bottiglio
Summary: Tensegrity robots, consisting of solid rods and tensile cables, are flexible and robust, suitable for uneven and unpredictable environments. Robotic skins can be attached to measure and control the shape of a tensegrity structure, transforming it into an active tensegrity robot capable of precise motions. This hardware and algorithm platform allows for surface-driven actuation and intrinsic state estimation, enabling tensegrity robots to perform tasks in real-world environments.
Article
Nanoscience & Nanotechnology
Zhenshan Zhai, Zhuang Li, Yixuan Du, Xin Gan, Linye He, Xiaotian Zhang, Yufeng Zhou, Jun Guan, Yangjian Cai, Xianyu Ao
Summary: This study discovered that spatially extended bound states in the continuum (BICs) in a 2D square lattice can generate simultaneous lasing modes under pulsed pumping. By adjusting the size of the nanoparticles, the remaining BIC mode can be tuned into the gain bandwidth. All BIC modes exhibited doughnut-shaped lasing patterns, with a polarization-dependent threshold. Multiple vortex beams can be generated by illuminating with multiple pump spots. Changing the nanoparticle shape from square to trapezoidal resulted in predominantly single-lobed lasing and suppressed two-lobe lasing at BIC modes, enabling on-chip multimode lasing with different polarization patterns for multiplexing not only in wavelength, but also in polarization.
Article
Optics
Hao Yang, Wojciech Roga, Jonathan D. Pritchard, John Jeffers
Summary: The study shows that quantum illumination has advantages over coherent states in object detection, even for simple direct photodetection. This advantage persists even when signal energy and object reflectivity are low, and background thermal noise is high. Furthermore, the advantage becomes even greater if signal beam detection probabilities are matched rather than mean photon numbers.
Article
Optics
Shachar Resisi, Sebastien M. Popoff, Yaron Bromberg
Summary: When multimode optical fibers are perturbed, data transmission is disrupted, but a deep learning approach can recover input images successfully by utilizing hidden correlations in speckle patterns.
LASER & PHOTONICS REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Wan Zhang, Feng Qiu, Yong Li, Rui Zhang, Huan Liu, Lun Li, Jiyang Xie, Wanbiao Hu
Summary: In this study, lattice defects were deliberately introduced in high-dielectric-constant paraelectric cubic BaTiO3 to fabricate MoS2 photodetectors with ultrahigh detection ability and outstanding field-effect traits. An organic-metal-based spincoating cum annealing method was used for material synthesis, with optimized thickness, high dielectric constant, and low dielectric loss, resulting in enhanced visible-light absorption. The synergistically enhanced mobility and photoabsorption in the MoS2/BTO FET demonstrate promising merits for high-performance photodetectors with excellent responsivity and detectivity.
Article
Optics
F. Mangini, M. Gervaziev, M. Ferraro, D. S. Kharenko, M. Zitelli, Y. Sun, V Couderc, E. Podivilov, S. A. Babin, S. Wabnitz
Summary: Spatial beam self-cleaning in multimode fibers has attracted research interest due to its potential applications. This study provides a comprehensive theoretical description of beam self-cleaning based on a statistical mechanics model, which is confirmed by extensive experimental characterization. The results demonstrate that beam self-cleaning can be fully understood using the basic laws of statistical mechanics.
Article
Engineering, Electrical & Electronic
Stefan Rothe, Qian Zhang, Nektarios Koukourakis, Juergen Czarske
Summary: The use of multimode fibers offers advantages in terms of transferable information density and security in communication technology. A new method based on a neural network is proposed for effective mode decomposition of multimode fibers, opening up new possibilities for the application of multimode fibers in optical communication networks for physical layer security.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Jan Perina, Vaclav Michalek, Radek Machulka, Ondrj Haderka
Summary: Selective post-selection of one beam out of a system of three correlated beams with bi-partite photon-number correlations leads to joint photon-number distributions with checkered patterns. The experimental and theoretical analysis shows nonclassical properties of these states as they vary with the ratio of correlated and anti-correlated contributions, confirmed by 2D histograms reconstructed by maximum-likelihood approach. The investigations suggest potential applications in two-photon excitations of atoms and molecules as well as two-photon spectroscopy.
Article
Physics, Applied
Jan Perina, Antonin Cernoch, Jan Soubusta
Summary: This study investigates a scheme for building stronger multimode twin beams from a large number of identical twin beams that are weak enough to be detected using single-photon-sensitive on-off detectors. The statistical properties of these compound twin beams, which exhibit nonclassical behavior, are analyzed for intensities up to hundreds of photon pairs and compared with genuine twin beams that require photon-number-resolving detectors. The use of compound twin beams for generating sub-Poissonian light and measuring absorption with sub-shot-noise precision is discussed, along with the development of a theoretical model to interpret experimental data.
PHYSICAL REVIEW APPLIED
(2021)
Article
Physics, Multidisciplinary
Joanna K. Kalaga, Wieslaw Leonski, Radoslaw Szczesniak, Jan Perina
Summary: We investigate the relationship between the states of three-qubit systems and linear entropy, as well as measures of coherence such as degree of coherence, first- and second-order correlation functions. We demonstrate that qubit-qubit states exhibit strong entanglement when the linear entropy falls within a certain range of values. Additionally, we derive the conditions for the boundary values of linear entropy, which are parameterized by measures of coherence.
Article
Engineering, Electrical & Electronic
Mariusz Drong, Maciej Dems, Jan Perina, Tibor Fordos, Henri-Yves Jaffres, Kamil Postava, Henri-Jean Drouhin
Summary: This study presents a theoretical framework that combines the laser rate equations and cavity perturbation theory for micro-cavity lasers with optical anisotropies. By deriving polarization-resolved coupled-mode equations, the method offers physical insights and accuracy comparable to finite-difference time-domain methods, saving time and suitable for semi-analytic studies.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Shilan Abo, Grzegorz Chimczak, Anna Kowalewska-Kudlaszyk, Jan Perina, Ravindra Chhajlany, Adam Miranowicz
Summary: We describe a novel type of blockade, called hybrid photon-phonon blockade, generated by linear coupling of photonic and phononic modes. By mixing the photonic and phononic modes, which do not exhibit blockade individually, we are able to generate the hybrid photon-phonon blockade.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Multidisciplinary
Artur Barasinski, Jan Perina Jr, Antonin Cernoch
Summary: Identification and quantification of quantum correlations are crucial for understanding and manipulating quantum devices and processes. We have developed and implemented a general method to quantify different forms of quantum correlations using experimental intensity moments up to the fourth order. These moments allow for the precise determination of global and marginal impurities of two-beam Gaussian fields, enabling the assessment of steering, tight lower and upper bounds for negativity, and the use of Kullback-Leibler divergence as a quantifier for nonseparability. The method has been successfully demonstrated on experimental twin beams and squeezed super-Gaussian beams. It can be readily applied to characterize quantum correlations in multibeam Gaussian fields.
PHYSICAL REVIEW LETTERS
(2023)
Article
Quantum Science & Technology
Jan Perina, Adam Miranowicz, Grzegorz Chimczak, Anna Kowalewska-Kudtaszyk
Summary: This paper discusses equivalent approaches to determine the eigenfrequencies of the Liouvillians of open quantum systems using the solution of the Heisenberg-Langevin equations and the corresponding equations for operator moments. The equivalence of both approaches is demonstrated by analyzing a simple damped two-level atom. The presented approach via the Heisenberg-Langevin equations reveals the structure and eigenfrequencies of quantum exceptional and diabolical points.
Article
Optics
Mariusz Drong, Jan Perina, Tibor Fordos, Henri Y. Jaffres, Kamil Postava, Henri-Jean Drouhin
Summary: It is found that spin-injected vertical-cavity surface-emitting lasers (spin-VCSELs) exhibit interesting functionalities when considering the linear gain anisotropy. Using the extended spin-flip model (SFM), exceptional points (EPs) are predicted in spin-VCSELs along with two interesting phenomena: polarization switching and frequency comb generation. These effects have great technological potential and are not limited to spin-VCSEL technology. The concept of anisotropy-engineered non-Hermitian microlasers and their polarization dynamics near EPs are discussed.
Proceedings Paper
Optics
Kishore Thapliyal, Jan Perina
Summary: This article systematically analyzes the generation of Stokes-anti-Stokes photon pairs in Raman scattering and provides suitable conditions for photon pair generation. In addition to the Raman active material properties and pump power, non-zero mean phonon number and losses in the phonon mode are also relevant parameters. Raman active materials with stronger anti-Stokes coupling are suitable for photon pair generation, even for non-zero thermal phonons as long as phonon losses are negligible.
22ND POLISH-SLOVAK-CZECH OPTICAL CONFERENCE ON WAVE AND QUANTUM ASPECTS OF CONTEMPORARY OPTICS
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Mariusz Drong, Jan Perina, Maciej Dems, Tomasz G. Czyszanowski, Tibor Fordos, Henri Jaffres, Kamil Postava, Henri-Jean M. Drouhin
Summary: We present a nonlinear coupled-mode theory for anisotropic microcavity lasers, particularly for birefringent spin-lasers. The model can be used to investigate the effects of spin modulation and grating parameters on the performance of realistic grating-based spin-lasers.
QUANTUM SENSING AND NANO ELECTRONICS AND PHOTONICS XVIII
(2022)
Article
Optics
Jan Perina, Pavel Pavlicek, Vaclav Michalek, Radek Machulka, Ondrej Haderka
Summary: This study derives nonclassicality criteria for general N-dimensional optical fields, which involve intensity moments, photon-number distribution probabilities, or combinations of both. The Hillery criteria for sums of even or odd photon numbers are generalized to N-dimensional fields. These criteria are then applied to an experimental three-mode optical field containing two types of photon-pair contributions, and the accompanying nonclassicality depths are used for performance comparison.
Article
Optics
Jan Perina, Vaclav Michalek, Radek Machulka, Ondrej Haderka
Summary: The research shows that the twin beams exhibit anticorrelations in photon-number fluctuations in the signal and idler beams under specific conditions, with sub-Poissonian photon-number statistics. The postselected fields are reconstructed from experimental data using the maximum likelihood method, and their nonclassical properties are analyzed and quantified using appropriate criteria. Comparisons are made between the postselected fields obtained with actual and ideal photon-number-resolved detectors.
Article
Optics
Kishore Thapliyal, Jan Perina
Summary: The quantum model of the Raman process examines nonclassical correlations between photons in the Stokes and anti-Stokes fields, analyzing the impact of various parameters on these correlations. The study also reveals conditions for the Stokes and anti-Stokes fields to be composed of only photon pairs, allowing for nonzero mean thermal phonon numbers.
