Article
Optics
Moriya Rosenfeld, Gil Weinberg, Daniel Doktofsky, Yunzhe Li, Lei Tian, Ori Katz
Summary: The study introduces a computational imaging approach that enables optical diffraction-limited imaging using a conventional acousto-optic imaging system, with the potential for microscopic investigations.
Review
Chemistry, Physical
Laurence Grimaud, Sami Lakhdar, Maxime R. Vitale
Summary: Although the concept of combining electrosynthesis with photochemistry has been around for many years, its practical application in organic synthesis has only recently emerged. This article highlights the power of this technology and how it can be used to overcome challenging oxidative or reductive processes. It presents recent chemical transformations that are otherwise inaccessible and discusses the important challenges and opportunities in this vibrant research field.
CURRENT OPINION IN ELECTROCHEMISTRY
(2023)
Article
Engineering, Electrical & Electronic
Dongliang Wang, Wang Cai, Yifan Zhen, Xiaoxia Yang, Bin Xue
Summary: This paper proposes a method called Compressed Acousto-optic Interferometry, which merges divergence sparsity and acousto-optic interferometry for sensing an acoustic wave field. The method combines compressed tomography with acousto-optic interferometry, potentially providing a real-time capture of the acoustic wave field for future sonar systems by omitting reference arms and reducing the number of lasers and photodetectors.
IEEE SENSORS JOURNAL
(2022)
Article
Optics
Christos Alexandropoulos, Marti Duocastella
Summary: Various quantitative phase imaging techniques are capable of characterizing transparent and low-contrast samples without the need for dyes or probes. However, current implementations can be limited by the lack of suitable optical systems for fast and customizable focal plane selection. In this study, we combine acousto-optics with pulsed illumination to enable accurate and on-demand electronic defocus control for phase imaging, achieving diffraction-limited spatial resolution and high reconstruction fidelity. The system demonstrates feasibility by measuring dynamic events at rates as high as 100 phase maps per second, paving the way for quantitative phase imaging in various fields.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Acoustics
Samuel A. A. Verburg, Earl G. G. Williams, Efren Fernandez-Grande
Summary: Acousto-optic sensing is a method that involves the interaction between sound and light, allowing the acquisition of acoustic information by measuring changes in light propagation. In this study, an acousto-optic holography method is proposed, which enables the noninvasive characterization of the radiated field. Experimental results demonstrate accurate holographic reconstructions of the pressure, particle velocity, and intensity fields. This method is particularly significant for studying sound fields at mid and high frequencies.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Biology
Stefan Abrahamczyk, Jan-Hendrik Struck, Maximilian Weigend
Summary: Ambophily, the mixed mode of wind and insect pollination, has been studied for over 130 years, but still lacks understanding. Experimental data on ambophily are rare, and the morphological and ecological characteristics of ambophilous plants and their evolution are uncertain. In this review, we summarize and evaluate the current understanding of ambophily based on experimental studies. Ambophilous species have evolved from both wind- and insect-pollinated ancestors, with traits overlapping with small generalist insect-pollinated species. Ecological factors such as pollen limitation, self-pollination, flower interference, and population density promote the evolution of ambophily. Experimental studies, observations of floral traits, and phylogenies suggest that ambophily may have evolutionary stability in some clades.
BIOLOGICAL REVIEWS
(2023)
Editorial Material
Optics
Jared Beller, Linbo Shao
Summary: Researchers have integrated acousto-optic devices on-chip to enhance their efficiency in integrated photonic circuits.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Optics
Maimouna Bocoum, Francois Figliolia, Jean-Pierre Huignard, Francois Ramaz, Jean-Michel Tualle
Summary: We report on the observation and correction of an imaging artifact attributed to the Talbot effect in the context of acousto-optic imaging using structured acoustic waves. When ultrasound waves are emitted with a periodic structure, the Talbot effect produces π-phase shifts of that periodic structure at every half of the Talbot distance in propagation. Here, we demonstrate both theoretically and experimentally how imposing an additional phase modulation on the acoustic periodic structure induces a symmetry constraint leading to the annihilation of the Talbot effect. This will significantly improve the acousto-optic image reconstruction quality and allows for an improvement of the reachable spatial resolution of the image.
Article
Biochemical Research Methods
Lukasz J. Nowak, Wiendelt Steenbergen
Summary: The performance of an acousto-optic imaging system is influenced by the distribution characteristics of light fluence rate and acoustic pressure field. By using plane wave instead of focused US pulses, it is possible to improve imaging performance by mitigating the influence of residual acoustic pressure field components. This approach also allows for clear two-dimensional reconstructions of light fluence rate maps.
JOURNAL OF BIOMEDICAL OPTICS
(2021)
Article
Optics
Ayato Okada, Rekishu Yamazaki, Maria Fuwa, Atsushi Noguchi, Yuya Yamaguchi, Atsushi Kanno, Naokatsu Yamamoto, Yuji Hishida, Hirotaka Terai, Yutaka Tabuchi, Koji Usami, Yasunobu Nakamura
Summary: This paper reports the development of a superconducting acousto-optic phase modulator on a lithium niobate substrate, with electrodes made of a superconducting niobium titanium nitride thin film for improved device performance. Operating at a cryogenic temperature, a length-half-wave-voltage product of 1.78 V.cm was observed, with further enhancement of modulation efficiency tested through an optical cavity with mirror coating. Simulation suggests that a simple extension of the current device could achieve efficient modulation with V-pi = 0.27 V.
Article
Physics, Multidisciplinary
Jia-Wei Meng, Shui-Jing Tang, Jialve Sun, Ke Shen, Changhui Li, Qihuang Gong, Yun-Feng Xiao
Summary: We propose and demonstrate the strong dissipative acousto-optic interaction between a suspended vibrating microfiber and a whispering-gallery microcavity. The dissipative response driven by an external stimulus of acoustic waves is found to be stronger than the dispersive response by 2 orders of magnitude. The study also shows the potential of this interaction for ultrasensitive detection of broadband acoustic waves.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Bapan Debnath, M. S. Meena, Jayashree A. Dharmadhikari, Saptarishi Chaudhuri, Reji Philip, Hema Ramachandran
Summary: In this paper, a novel technique for improving image visibility is proposed, which utilizes the quadrature lock-in discrimination algorithm with the demodulation performed using an acousto-optic modulator. Significant enhancement in image visibility is achieved by processing a series of frames. The effect of camera parameters on enhancing image visibility is investigated through systematic imaging.
Article
Optics
Louis Dutheil, Maimouna Bocoum, Mathias Fink, Sebastien M. Popoff, Francois Ramaz, Jean-Michel Tualle
Summary: Acousto-optic imaging is an optical imaging technique for highly scattering media, with potential applications in imaging living biological tissues. It is sensitive to speckle decorrelation on the millisecond time scale and requires integration time lower than decorrelation time scales. Combining Fourier transform acousto-optic imaging with off-axis holography can create a system compatible with in vivo imaging prerequisites, as demonstrated experimentally with in-depth imaging inside a multiple scattering sample.
Article
Biochemical Research Methods
Lukasz J. Nowak, Wiendelt Steenbergen
Summary: An acousto-optic imaging system using compact, triggerable lasers and a probe with an ultrasound linear array and attached optical fiber was presented. Challenges include laser parameter instabilities and precise synchronization of ultrasound and laser pulses, which were addressed through the development of an electronic feedback circuit and a microcontroller-based synchronization system. The system demonstrated improvements in peak signal to noise ratio by adjusting the region of interest within the camera sensor matrix and the number of laser pulses illuminating every frame. The synchronization algorithm and system developed were crucial in ensuring imaging quality and accuracy.
BIOMEDICAL OPTICS EXPRESS
(2021)
Article
Optics
Christopher J. Sarabalis, Raphael Van Laer, Rishi N. Patel, Yanni D. Dahmani, Wentao Jiang, Felix M. Mayor, Amir H. Safavi-Naeini
Summary: Acousto-optic modulators have long been important tools for controlling light since the advent of lasers. Recent advances in on-chip lithium niobate waveguide technology have opened up new opportunities for these devices. Demonstrating a collinear acousto-optic modulator in a suspended film of lithium niobate with a high-confinement, wavelength-scale waveguide significantly improves the modulator's efficiency.
Article
Education, Scientific Disciplines
Stefan Catheline, Victor Delattre, Gabrielle Laloy-Borgna, Frederic Faure, Mathias Fink
Summary: Through experiments and simulations, it is found that wave propagation on a two-dimensional fabric membrane is analogous to gravitational lensing. The experiment demonstrates how wave propagation is influenced by the topology of the transmission medium.
AMERICAN JOURNAL OF PHYSICS
(2022)
Article
Biochemical Research Methods
Viacheslav Mazlin, Peng Xiao, Kristina Irsch, Jules Scholler, Kassandra Groux, Kate Grieve, Mathias Fink, A. Claude Boccara
Summary: This study investigates the natural axial movements of the human eye and demonstrates the potential to modulate optical phase and retrieve tomographic images using time-domain full-field optical coherence tomography. The research suggests a simplified ophthalmic imaging device that operates without the need for piezo motor-camera synchronization.
BIOMEDICAL OPTICS EXPRESS
(2022)
Editorial Material
Engineering, Electrical & Electronic
Geoffroy Lerosey, Mathias Fink
IEEE ANTENNAS AND PROPAGATION MAGAZINE
(2022)
Article
Acoustics
Ugur Soysal, Pedro N. Azevedo, Flavien Bureau, Alexandre Aubry, Marcio S. Carvalho, Amanda C. S. N. Pessoa, Lucimara G. De La Torre, Olivier Couture, Arnaud Tourin, Mathias Fink, Patrick Tabeling
Summary: The study successfully generated freeze-dried monodisperse microbubbles using microfluidic technology and preserved their performance through a novel retrieval technique. This work solves the storage and transportation challenges of highly monodisperse bubbles and may lead to new clinical non-invasive measurement methods.
ULTRASOUND IN MEDICINE AND BIOLOGY
(2022)
Article
Biology
Kassandra Groux, Anna Verschueren, Celine Nanteau, Marilou Clemencon, Mathias Fink, Jose-Alain Sahel, Claude Boccara, Michel Paques, Sacha Reichman, Kate Grieve
Summary: Dynamic full-field optical coherence tomography (D-FFOCT) enables real-time observation of organelles and cytoskeleton dynamics in primary porcine and human stem cell-derived retinal pigment epithelium (RPE) cells, providing valuable insights into the physiology of both healthy and diseased RPE cells. This innovative method could potentially be used for diagnostics and treatment guidance in degenerative diseases.
COMMUNICATIONS BIOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Geoffroy Lerosey, Mathias Fink
Summary: Reconfigurable intelligent surfaces (RISs) are gaining momentum in wireless communications for their ability to shape and dynamically reconfigure electromagnetic waves, leading to more efficient and greener wireless communications. This article reviews the seminal works and proposes a physicist's point of view on RISs, highlighting their limitations.
PROCEEDINGS OF THE IEEE
(2022)
Article
Computer Science, Interdisciplinary Applications
William Lambert, Justine Robin, Laura A. Cobus, Mathias Fink, Alexandre Aubry
Summary: This article presents a matrix approach for quantifying and correcting aberrations in ultrasound imaging. By analyzing the focused reflection matrix, which contains more information than traditional ultrasound images, the scattering contributions and aberrations can be measured. Compared to traditional methods, this approach provides better contrast and transverse resolution.
IEEE TRANSACTIONS ON MEDICAL IMAGING
(2022)
Article
Computer Science, Interdisciplinary Applications
William Lambert, Laura A. Cobus, Justine Robin, Mathias Fink, Alexandre Aubry
Summary: This article presents a matrix approach for ultrasound imaging in heterogeneous media, focusing on the quantification and correction of aberration. By decoupling the aberrations and applying an iterative strategy, compensation for high-order and spatially-distributed aberrations can be achieved. Numerical validation demonstrates that the proposed method significantly improves the contrast and transverse resolution of ultrasound images.
IEEE TRANSACTIONS ON MEDICAL IMAGING
(2022)
Article
Engineering, Electrical & Electronic
George C. Alexandropoulos, Ali Mokh, Ramin Khayatzadeh, Julien de Rosny, Mohamed Kamoun, Abdelwaheb Ourir, Arnaud Tourin, Mathias Fink, Merouane Debbah
Summary: This article discusses the possibility of achieving high-resolution spatiotemporal focusing in 6G wireless communications using the time-reversal (TR) technique. By analyzing experimental setups and results, the effectiveness of TR in different frequency bands is demonstrated, and its potential for low-complexity multiuser communications is showcased. The opportunities and challenges of incorporating TR-based wireless communications into 6G networks, in conjunction with other candidate technologies, are also emphasized.
IEEE VEHICULAR TECHNOLOGY MAGAZINE
(2022)
Article
Engineering, Mechanical
Zhao Li, Pedro Lee, Mathias Fink, Ross Murch, Mark Davidson
Summary: This study proposes a passive detection method that utilizes ambient noise in water pipeline networks to extract key parameters and detect faults. Field experiments and data processing results validate the effectiveness of this method, showing similar accuracy and performance to conventional active detection methods.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Physics, Multidisciplinary
Samuel Hidalgo-Caballero, Surabhi Kottigegollahalli Sreenivas, Vincent Bacot, Sander Wildeman, Maxime Harazi, Xiaoping Jia, Arnaud Tourin, Mathias Fink, Alvaro Cassinelli, Matthieu Labousse, Emmanuel Fort
Summary: This article presents a counterintuitive concept of achieving time reversal of waves by using a transitory dissipation pulse. By applying sudden and strong damping in a limited time, a time-reversed wave can be generated. In the case of high damping shock, the initial wave freezes by maintaining the wave amplitude and cancelling its time derivative, resulting in two counterpropagating waves with halved amplitude and opposite time evolutions. This damping-based time reversal is demonstrated using phonon waves in a lattice of interacting magnets on an air cushion, and computer simulations show its applicability to broadband time reversal in complex disordered systems.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Flavien Bureau, Justine Robin, Arthur Le Ber, William Lambert, Mathias Fink, Alexandre Aubry
Summary: Matrix imaging is revolutionizing wave physics by optimizing compensation for aberrations and multiple scattering in heterogeneous media. This paper extends ultrasound matrix imaging to a 3D geometry and proposes a non-invasive approach to make the skull transparent for improved brain imaging.
NATURE COMMUNICATIONS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Ali Mokh, Julien de Rosny, George C. Alexandropoulos, Mohamed Kamoun, Abdelwaheb Ourir, Ramin Khayatzadeh, Arnaud Tourin, Mathias Fink
Summary: This paper focuses on the application of Time Reversal (TR) precoding scheme in subTHz frequency bands and provides experimental validation. The results demonstrate high-speed multi-user communication with a few millimeters of separation distance.
2022 IEEE 95TH VEHICULAR TECHNOLOGY CONFERENCE (VTC2022-SPRING)
(2022)
Proceedings Paper
Computer Science, Information Systems
Ali Mokh, Julien de Rosny, George C. Alexandropoulos, Ramin Khayatzadeh, Mohamed Kamoun, Abdelwaheb Ourir, Arnaud Tourin, Mathias Fink
Summary: This paper proposes an iterative Time-Reversal Division Multiple Access (TRDMA) approach to reduce interference levels in multiple access scenarios and evaluates its performance through experiments. The results show that the proposed approach is more efficient in terms of algorithmic iterations compared to conventional TRDMA, and it is applicable to mobile user configurations.
2022 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE (WCNC)
(2022)
Article
Materials Science, Multidisciplinary
Mario Junior Mencagli, Dimitrios L. Sounas, Mathias Fink, Nader Engheta
Summary: We theoretically demonstrate that a uniform static electric field distribution can be partially converted to radiation fields when a portion of the medium undergoes a temporal change of its permittivity. Closed analytical expressions are derived for the radiated electric and magnetic fields in a waveguide charged with a DC voltage source containing a dielectric block with a steplike temporal change. The exchange of energy between the electrostatic and electromagnetic fields is discussed, and the reconciliation between the seemingly contradictory temporal and spatial boundary conditions for the electric and magnetic fields at the interface of the time-varying dielectric block is analyzed and elucidated.
