Article
Optics
Changbiao Li, Qingsong Yu, Yanpeng Zhang, Min Xiao, Zhaoyang Zhang
Summary: Optical isolation based on optical parametric amplification is demonstrated in a coherent three-level atomic configuration. By oppositely launching the probe beams to satisfy or not satisfy the phase-matching condition, the beams can pass through the medium experiencing parametric amplification or strong resonant absorption. This magnet- and cavity-free optical isolation exhibits a high isolation ratio and a broad bandwidth.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Zunyue Zhang, Yi Wang, Jiarui Wang, Dan Yi, David Weng U. Chan, Wu Yuan, Hon Ki Tsang
Summary: In this study, a compact integrated scanning spectrometer is proposed, which utilizes a tunable micro-ring resonator and a single arrayed waveguide grating to achieve wide optical bandwidths and high spectral resolutions. The integrated spectrometer with germanium photodetectors demonstrates excellent performance.
PHOTONICS RESEARCH
(2022)
Article
Optics
Dezheng Liao, Jun Xin, Jietai Jing
Summary: In this paper, a nonlinear interferometer based on NITFPA is proposed, showing unique advantages in precision enhancement of phase estimation and robustness against losses compared to SUI. This NITFPA may have potential applications in quantum metrology.
OPTICS COMMUNICATIONS
(2021)
Article
Optics
Huakun Li, Kaiyuan Liu, Tongtong Cao, Lin Yao, Ziyi Zhang, Xiaofeng Deng, Chixin Du, Peng Li
Summary: Motion contrast optical coherence tomography angiography (OCTA) aims to identify dynamic flow signals accurately. An intermediate region with mixed distribution of dynamic and static scatterers often occurs in practice, degrading vascular contrast and connectivity. A new OCTA classifier, SID-OCTA, was developed and experimentally validated for improved performance.
Article
Optics
Reddikumar Maddipatla, Patrice Tankam
Summary: Combining optical coherence microscopy with fluorescence microscopy allows for the alignment of structural and functional information, enabling new investigations into biological processes in animal models.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Physics, Applied
Haohao Wang, Yuanzheng Ma, Shuxiang Zhao, Yujing Li, Linghua Wu, Huan Qin, Da Xing
Summary: A non-contact thermoacoustic imaging system based on the Fabry-Perot interference principle has been developed, providing high sensitivity and resolution for breast tumor screening.
APPLIED PHYSICS LETTERS
(2021)
Article
Optics
G. Frascella, R. Zakharov, O. Tikhonova, M. Chekhova
Summary: Phase-sensitive optical parametric amplification of squeezed states helps to improve the robustness of sub-shot-noise sensing by overcoming detection loss and noise. Multimode amplification is required for techniques operating with multimode light, and optimal methods for multimode phase-sensitive amplification have been found and verified in an experiment. Performing phase-sensitive amplification in the near field is crucial for sub-shot-noise imaging.
Article
Optics
Jianan Fang, Kun Huang, E. Wu, Ming Yan, Heping Zeng
Summary: This article introduces an infrared 3D imaging system capable of detecting three-dimensional structure and reflectivity information. The system operates at single-photon sensitivity and femtosecond timing resolution, enabling imaging under low-light conditions. By nonlinear frequency upconversion and recording with a silicon camera, the presented system achieves high lateral and depth resolutions for 3D reconstruction. Additionally, a numerical denoiser based on spatiotemporal correlation allows the retrieval of object profile and reflectivity even with a detected flux below 0.05 photons/pixel/second. This infrared 3D imager features high detection sensitivity, precise timing resolution, and wide-field operation, offering new possibilities in life and material sciences.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Optics
Niels M. Israelsen, Peter John Rodrigo, Christian R. Petersen, Getinet Woyessa, Rasmus E. Hansen, Peter Tidemand-Lichtenberg, Christian Pedersen, Ole Bang
Summary: We report on mid-infrared optical coherence tomography (OCT) at 4 μm with an increased A-scan scan rate of 3 kHz, using collinear sum-frequency upconversion. Two spectral realizations are demonstrated with improved imaging speed and axial resolution, showing potential applications in sub-surface micro-mapping and real-time monitoring of CO2.
Editorial Material
Multidisciplinary Sciences
Tinsley H. Davis
Summary: Optical coherence tomography (OCT), a noninvasive imaging method that measures the delay in return of reflected light, has become a standard of care in ophthalmology and has various applications in medical and industrial fields. James Fujimoto, David Huang, and Eric Swanson won the LaskerDeBakey Clinical Medical Research Award for their invention and development of OCT, and in an interview, they discussed the technology's development and future applications.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Chemistry, Multidisciplinary
Dulanjan Harankahage, James Cassidy, Jacob Beavon, Jiamin Huang, Niamh Brown, David B. Berkinsky, Andrew Marder, Barbra Kayira, Michael Montemurri, Pavel Anzenbacher, Richard D. Schaller, Liangfeng Sun, Moungi G. Bawendi, Anton V. Malko, Benjamin T. Diroll, Mikhail Zamkov
Summary: Many optoelectronic processes in colloidal semiconductor nanocrystals suffer from efficiency decline under high-intensity excitation due to Auger recombination. Semiconductor quantum shells have emerged as a promising solution for suppressing Auger decay, but their optoelectronic performance is limited by surface-related carrier losses. Introducing quantum shells with a CdS-CdSe-CdS-ZnS multilayer structure inhibits surface carrier decay and improves photoluminescence quantum yield, while retaining a high biexciton emission quantum yield. This improvement allows for longer Auger lifetimes and suppressed blinking in single nanoparticles, making ZnS-encapsulated quantum shells beneficial for applications with high-power optical or electrical excitation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Physics, Applied
Shiqing Wu, Jing Li, Chao Tao, Xiaojun Liu
Summary: A transmission-mode photoacoustic microscope was developed to achieve quantitative images of two molecular components in tissues. By scanning the specimen once with a single-wavelength laser, a linear equation system was proposed to describe the relationship between signal magnitude and molecular concentrations. This method accurately quantifies concentrations and reveals gradients in mixtures, providing a potential solution to limitations of multiple excitations.
APPLIED PHYSICS LETTERS
(2022)
Letter
Optics
Chiara Lindner, Jachin Kunz, Simon J. Herr, Jens Kiessling, Sebastian Wolf, Frank Kuehnemann
Summary: In recent years, quantum sensing concepts based on correlated photon pairs generated by spontaneous parametric down-conversion (SPDC) have been developed. By using SPDC far from frequency degeneracy, the mid-infrared photon can interact strongly with the sample, while the correlated near-infrared photon allows for low-noise detection. However, the small number of photons provided by SPDC and the resulting inferior signal-to-noise ratio have limited the wide applicability of this sensing concept. In this study, a nonlinear interferometer based on pump-enhanced SPDC with greatly improved emission rates and broadband spontaneous emission is demonstrated. This marks an essential step towards real-world applications, as high-resolution mid-infrared spectroscopy with near-infrared detection and improved accuracy is achieved, even with a significantly smaller number of mid-infrared photons compared to classical spectrometers.
Article
Engineering, Electrical & Electronic
Xin Ge, Shufen Chen, Si Chen, Linbo Liu
Summary: High resolution optical coherence tomography (HR-OCT) has made significant progress in imaging cellular and extracellular structures, with broad clinical applications. This review focuses on the latest advancements in technology development and clinical research using this powerful imaging tool, promoting interdisciplinary research.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Yu-Chan Lin, Teng-I Yang, Sheng-Lung Huang
Summary: In this study, an ultra-broadband wavelength-swept laser was developed using glass-clad Ti:sapphire crystal fiber as the gain media, achieving high tuning bandwidth and resolution.
Article
Optics
Andrei Rasputnyi, Denis A. Kopylov, Tatiana Murzina, Maria Chekhova
Summary: This study investigates the spectral properties of broadband phase-matched and nonphase-matched cascaded up-conversion (CUpC) radiation in a nonlinear crystal, and predicts the super-bunching characteristics of CUpC radiation.
Article
Optics
Paula Cutipa, Maria Chekhova
Summary: Entangled photons offer advantages for two-photon absorption spectroscopy, but practicality is limited and bright squeezed vacuum can be an alternative. Bright squeezed vacuum provides a modest efficiency increase and high resolution in both time-frequency and space-wavevector simultaneously.
Article
Multidisciplinary Sciences
Sebastian Toepfer, Marta Gilaberte Basset, Jorge Fuenzalida, Fabian Steinlechner, Juan P. Torres, Markus Grafe
Summary: Holography uses interference of a light field to reconstruct the spatial shape of an object, but traditional methods are limited by detection constraints outside the visible range. By implementing phase-shifting holography with nonclassical states of light and quantum interference between two-photon probability amplitudes, it is possible to overcome these limitations and retrieve the spatial shape of transmitted/reflected photons from the object.
Article
Optics
Arturo Villegas, Mario A. Quiroz-Juarez, Alfred B. U'Ren, Juan P. Torres, Roberto de J. Leon-Montiel
Summary: In this study, we propose and demonstrate a smart laser-diffraction analysis technique for identifying particle mixtures. By using model particles, we accurately retrieve information about two-component heterogeneous mixtures with high accuracy. The method simplifies implementation and paves the way for the development of novel smart identification technologies.
Article
Optics
Vitaliy Sultanov, Tomas Santiago-Cruz, Maria Chekhova
Summary: This research explores the implementation of polarization entanglement in quantum optics using the concept of flat optics. By utilizing the relaxed phase matching of flat nonlinear optical sources, the researchers were able to generate photon pairs with tunable polarization entanglement. The resulting polarization entanglement, combined with a broadband frequency spectrum, led to an ultranarrow Hong-Ou-Mandel effect and potential extensions to hyper-entanglement.
Article
Optics
Daniel F. Urrego, Juan P. Torres
Summary: We propose and experimentally demonstrate a quantum-inspired protocol for quantifying the degree of similarity between two spatial shapes in optical beams without the need for amplitude and phase measurement. Instead, the desired information can be obtained by measuring the degree of polarization of the combined optical beam, which is easier to implement experimentally. The protocol utilizes non-separable optical beams, where different degrees of freedom (polarization and spatial shape) cannot be described independently. One important feature of this method is its ability to compare two unknown spatial shapes.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2022)
Article
Multidisciplinary Sciences
Tomas Santiago-Cruz, Sylvain D. Gennaro, Oleg Mitrofanov, Sadhvikas Addamane, John Reno, Igal Brener, Maria Chekhova
Summary: This study demonstrates the generation of entangled photons through spontaneous parametric downconversion in semiconductor metasurfaces with high-quality factor and quasi-bound state in the continuum resonances. The metasurfaces enhance the quantum vacuum field, leading to the emission of nondegenerate entangled photons in multiple narrow resonance bands and over a wide spectral range. By pumping a single resonance or multiple resonances at different wavelengths, multifrequency quantum states, including cluster states, can be generated.
Article
Chemistry, Multidisciplinary
Changjin Son, Vitaliy Sultanov, Tomas Santiago-Cruz, Aravind P. P. Anthur, Haizhong Zhang, Ramon Paniagua-Dominguez, Leonid Krivitsky, Arseniy I. I. Kuznetsov, Maria V. V. Chekhova
Summary: This study demonstrates the generation of entangled photon pairs with controlled emission directivity from a metasurface. The use of geometric resonances in the metasurface enhances the pair generation rate by 67 times compared to an unpatterned film. The observed bi-directional emission and fine spectral splitting of entangled photons have not been previously observed in nanoscale sources.
Article
Optics
Zi S. D. Toa, Maria V. Chekhova, Leonid A. Krivitsky, Anna Paterova
Summary: Nonlinear interferometers with quantum correlated photons have been shown to enhance optical characterization and metrology. They can be used in gas spectroscopy, particularly for greenhouse gas monitoring, breath analysis, and industrial applications. This study demonstrates that gas spectroscopy can be further improved with crystal superlattices, which are cascaded arrangements of nonlinear crystals forming interferometers. The use of superlattices allows for increased sensitivity and the ability to measure different observables relevant to practical applications.
Article
Optics
Santiago Lopez-huidobro, Mohammad Noureddin, Maria Chekhova, Nicolas Y. JOLy
Summary: Researchers have successfully generated pairs of biphotons, one in the ultraviolet and its entangled partner in the infrared spectral range, using a xenon-filled single-ring photonic crystal fiber and four-wave mixing. By adjusting the gas pressure, the frequency of the biphotons can be tuned, with the ultraviolet photons ranging from 271 nm to 231 nm and their entangled partners ranging from 764 nm to 1500 nm. This breakthrough enables spectroscopy and sensing with undetected photons in the ultraviolet range.
Article
Optics
Mahmoud Kalash, Maria V. Chekhova
Summary: Wigner function tomography is an important tool for characterizing quantum states, but the commonly used method has some weaknesses. We propose a new method based on optical parametric amplification and direct detection, which overcomes these issues and is suitable for measuring multimode and broadband states. We experimentally verify the method and demonstrate its potential for measuring squeezed states and bright non-Gaussian states.
Article
Optics
Arturo Rojas-Santana, Gerard J. Machado, Maria V. Chekhova, Dorilian Lopez-Mago, Juan P. Torres
Summary: This study analyzes and compares the output signals obtained in three different configurations of optical coherence tomography (OCT) in order to evaluate the performance of different configurations in extracting information about the sample. The configurations include standard OCT and two types of OCT schemes based on nonlinear interferometers, with the optical sectioning of the sample achieved by measuring the output signal spectrum.
Article
Physics, Multidisciplinary
Girish Kulkarni, Jeremy Rioux, Boris Braverman, Maria Chekhova, Robert W. Boyd
Summary: In this study, we model spontaneous parametric down-conversion (SPDC) as classical difference frequency generation (DFG) of the pump field and a hypothetical stochastic vacuum seed field. We analytically demonstrate that the second-order spatiotemporal correlations of the field generated from the DFG process replicate those of the signal field from SPDC. The model agrees with quantum calculations and experimental measurements in different gain regimes, and successfully captures second-order SU(1,1) interference and induced coherence effects. The model also predicts the linear scaling of interference visibility with object transmittance in the low-gain regime.
PHYSICAL REVIEW RESEARCH
(2022)
