Article
Multidisciplinary Sciences
Bingzhao Li, Qixuan Lin, Mo Li
Summary: Due to superior imaging resolution and range, LiDAR is becoming an essential optical perception technology for intelligent automation systems. However, many existing beam-steering technologies are still bulky, fragile, and expensive. This study presents an on-chip acousto-optic beam-steering technique that overcomes these challenges. By utilizing Brillouin scattering, this technique achieves frequency-angular resolving LiDAR with a simple device construction, control system, and detection scheme, demonstrating a wide field of view and high angular resolution.
Article
Optics
Jeong Hyun Huh, Zaijun Chen, Edoardo Vicentini, Theodor W. Haensch, Nathalie Picque
Summary: This study conducted time-resolved near-infrared absorption spectroscopy of single non-repeatable transient events with a dual-comb interferometer, achieving high spectral resolution and up to 50 s of mutual coherence time without active stabilization system. The time resolution was as short as 100 ms in the experimental demonstration, enabling precise determination of rovibrational line parameters.
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
Engineering, Electrical & Electronic
Ori Henderson-Sapir, Nathaniel Bawden, Antreas Theodosiou, Matthew R. Majewski, Kyriacos Kalli, Stuart D. Jackson, David J. Ottaway
Summary: A mode-locked, dual-wavelength pumped 3.5 μm fiber laser using frequency shifted feedback and an acoustooptic modulator is presented. The laser produced pulses of 3.8 ps with an energy of 9.7 nJ at a repetition rate of 37.75 MHz, resulting in a peak power of 2.55 kW. Additionally, an electronically wavelength swept, mid-IR interrogator was developed for characterizing a mid-IR fiber Bragg grating.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Xialin Liu, Boris Braverman, Robert W. Boyd
Summary: We demonstrate a high-speed spatial light modulator (SLM) that can generate arbitrary spatial profiles in a laser pulse by mapping the temporal radio-frequency (RF) waveform to the optical field using an acousto-optic modulator (AOM). The fidelity of the SLM performance can be improved through numerical optimization of the RF waveform to overcome the nonlinearity of the AOM. The resulting acousto-optic SLM has a 50 μm pixel pitch, over 1 MHz update rate, and high damage threshold.
Article
Optics
Andrey Voloshin, Sergey Mantsevich
Summary: Examination of various issues related to the generation and application of optical frequency combs (OFCs) is an important branch of modern optoelectronics. Some of the proposed OFC generation methods apply acousto-optic (AO) devices. The experiments in this paper investigate the influence of AO mismatch on OFC characteristics and demonstrate the possibility of tunable AO dual comb downconversion with a single AO device.
Article
Optics
Florian Nicolai, Niklas Mueller, Cristian Manzoni, Giulio Cerullo, Tiago Buckup
Summary: Compression, shaping, and characterization of broadband mid-infrared (MIR) pulses based on an acousto-optic modulator (AOM) pulse shaper is demonstrated. Spectral phase characterization is achieved using an AOM-shaper based dispersion scan (d-scan) method. The setup's capabilities are showcased by imprinting test phases on broadband MIR pulses and retrieving them using d-scan, ultimately allowing pulse compression below 50 fs FWHM autocorrelation.
Article
Optics
Konstantin B. Yushkov, Maxim Kupreychik, Dmitry Obydennov, Vladimir Y. Molchanov
Summary: One of the emerging applications of acousto-optic tunable filters (AOTFs) is spatial filtering of optical beams. A noncollinear AOTF has a tunable ring-shaped transfer function determined by the geometry of the refractive index surface in a uniaxial crystal. The geometrical parameters of the AOTF's elliptic transfer function under noncritical phase matching condition in uniaxial crystals are rigorously derived. These transfer functions can be used for synthesis of axially symmetric transfer functions with the help of multifrequency ultrasonic signals. A two-color tunable optical trap configuration is proposed based on a single AOTF used for laser beam shaping.
Article
Optics
Shuai Huang, Chaoyong Chen, Kaixin Wang, Xu Zhang, Qing Wang, Chunqing Gao
Summary: This study demonstrates a wavelength tunable single-longitudinal-mode Er:YAG ring laser around 1.6 μm, achieving high power and stable dual-wavelength operation with high slope efficiency and small output linewidth.
Article
Chemistry, Physical
Vladimir Balakshy, Maxim Kupreychik, Sergey Mantsevich, Vladimir Molchanov
Summary: This study investigates the anisotropic acousto-optic interaction in a spatially periodical acoustic field created by a phased-array transducer. The experiments confirm the theoretical analysis showing absence of diffraction when the optical beam falls on the phased-array cell at the Bragg angle. The research highlights the potential of this kind of acousto-optic interaction for designing new types of acousto-optic devices.
Article
Multidisciplinary Sciences
Dorian Treptow, Raul Bola, Estela Martin-Badosa, Mario Montes-Usategui
Summary: Acousto-optic deflectors, known for their high modulation rates and optical power resilience, may challenge liquid crystal spatial light modulators in holographic applications. A holographic acousto-optic light modulation system has been developed to eliminate coherent artifacts and achieve high fidelity intensity pattern reconstruction. This approach may elevate acousto-optic deflectors to compete with LC-SLMs in various applications requiring large optical powers, high modulation speeds, and accurate intensity patterns.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Electrical & Electronic
Yan-He Lv, Ren Wang, Chang-Hai Hu, Xiao Ding, Bing-Zhong Wang
Summary: This article introduces a novel array of radiation and scattering function-integrated metasurface antenna (RSIMA) elements for radiation beam scanning and two examples of scattered field shaping. The RSIMA array has the characteristics of independently obtaining a wide range of reflection phases and the radiation performance not significantly affected by layout changes.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Multidisciplinary Sciences
Xiaosheng Zhang, Kyungmok Kwon, Johannes Henriksson, Jianheng Luo, Ming C. Wu
Summary: The paper presents a 16,384-pixel LiDAR sensor with wide field of view, high resolution, narrow beam divergence, and fast operation speed. The sensor can be mass-produced and used in various applications such as autonomous cars, drones, robots, and smartphones.
Article
Computer Science, Information Systems
Yi-Ting Lin, Zuo-Min Tsai, Jen-Ming Wu
Summary: This paper presents an 8-element phased array system and proposes a novel beam control method using the matrix-sum method. The experiment results showed that the proposed system achieved higher beam-steering accuracy and system gain.
Article
Materials Science, Multidisciplinary
Manisha Bharati, Lokesh Rana, Reema Gupta, Anjali Sharma, Pradip K. Jha, Monika Tomar
Summary: This study focuses on the indigenous pump-probe technique to investigate acousto-optic modulation using a surface acoustic wave (SAW) device. A visible modulation in the intensity of the probe laser beam was observed through the monitoring of the coupling between acoustic wave and optical wave. The angular rotation of the SAW device showed the periodicity of the substrate's nonlinearity while the acoustic wave propagated in it. The study also examined the influence of variation in pump laser beam intensity on acousto-optic modulation. The observed acousto-optic modulation behavior in surface acoustic devices demonstrates potential applications in signal modulation for telecommunications and frequency control in spectroscopy.
Article
Materials Science, Ceramics
A. Boonruang, T. Thongchai, Y. Jiang, C. E. M. Demore, S. Neale, A. Moldovan, T. W. Button, S. Cochran
Summary: This article introduces a preparation method for 1-3 randomised piezocomposite used in the fabrication of micro-ultrasound linear arrays. Through gel casting and micromoulding techniques, the structure of the material was successfully controlled, allowing for effective suppression of spurious modes while maintaining good flowability. The array made from this material demonstrated a lower resonant ability in the thickness mode frequency range, with a wide bandwidth and short pulse length.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Multidisciplinary Sciences
Jie Zhang, Xudong Niu, Anthony J. Croxford, Bruce W. Drinkwater
Summary: This paper explores possible strategies for continuous non-destructive monitoring of large-scale structures using a collection of inspection robots. The robots use guided ultrasonic waves to detect and locate defects. Monte Carlo simulations reveal the compromise between the number of robots and defect location accuracy.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Article
Engineering, Multidisciplinary
Xin L. Tu, Richard J. Pyle, Anthony J. Croxford, Paul D. Wilcox
Summary: The previous implementation of the nonlinear autoregressive network with exogenous input (NARX) showed excellent performance in defect detection in guided wave signals. However, it lacked robustness and its performance varied during training. By introducing a new NARX structure that enables multi-step prediction, the training process becomes more stable and the overall detection performance is improved.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Acoustics
Carlos-Felipe Roa, Nidhi Singh, Emmanuel Cherin, Jianhua Yin, Aaron Boyes, F. Stuart Foster, Christine E. M. Demore
Summary: Micro-ultrasound (micro-US) has become an invaluable tool in research and clinical applications. This study presents a method for connecting array elements in spatially constrained conditions and demonstrates its effectiveness in connecting with a micro-US array. The proposed manufacturing methods facilitate the development of flexible endoscopic or small-footprint micro-US devices.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2022)
Article
Engineering, Biomedical
Joseph A. Sebastian, Eric M. Strohm, Emmanuel Cherin, Bahram Mirani, Christine E. M. Demore, Michael C. Kolios, Craig A. Simmons
Summary: High-frequency ultrasound can non-invasively characterize and monitor the acoustic properties of biomaterials and engineered tissues. A new method is proposed to accurately measure the speed of sound, acoustic impedance, and acoustic attenuation of cell-laden hydrogels, taking into account the frequency-dependent effects of attenuation in coupling media, hydrogel thickness, and interfacial transmission/reflection coefficients of ultrasound waves. The acoustic attenuation coefficients were found to increase with increasing cell concentration, reflecting the cellularity of the hydrogel independent of its thickness.
ACTA BIOMATERIALIA
(2023)
Article
Clinical Neurology
Benjamin Clennell, Tom G. J. Steward, Kaliya Hanman, Tom Needham, Janette Benachour, Mark Jepson, Meg Elley, Nathan Halford, Kate Heesom, Eunju Shin, Elek Molnar, Bruce W. Drinkwater, Daniel J. Whitcomb
Summary: This study reveals the regulation of neuronal excitability and synaptic function by ultrasound stimulation. Ultrasound stimulation can increase whole-cell potassium currents and excitatory synaptic transmission. Activation of ionotropic glutamate receptors is required for ultrasound-induced modulation of neuronal potassium currents. These findings have important implications for the application of ultrasound stimulation in experimental and therapeutic settings, but further research is needed to understand the underlying molecular mechanisms.
Article
Materials Science, Characterization & Testing
Yuan Xue, Anthony J. Croxford, Paul D. Wilcox
Summary: This paper studies the impact of positioning inaccuracy, array element variability, and couplant wave velocity variability on inspection repeatability performance. It proposes a post-processing approach to compensate for the degradation in repeatability caused by changes in these parameters. The study finds that positioning inaccuracy and couplant wave velocity variability are the dominant factors affecting inspection repeatability, and the effect of element variability is negligible. The proposed compensation approach offers significant performance advantages for baseline subtraction and early-stage crack detection.
NDT & E INTERNATIONAL
(2023)
Article
Materials Science, Characterization & Testing
Xudong Niu, Jie Zhang, Anthony Croxford, Bruce Drinkwater
Summary: This study explores how to accurately simulate the elastodynamic scattering behavior of an arbitrary defect using finite element analysis. The method involves measuring the scattered wave field and decomposing it into multi-modal far-field scattering amplitudes to determine the angular order of scattering. The results show that this approach allows for more efficient modeling of guided wave scattering and contributes to a better understanding of experimental defect characterization.
NONDESTRUCTIVE TESTING AND EVALUATION
(2023)
Article
Acoustics
Richard J. Pyle, Robert R. Hughes, Paul D. Wilcox
Summary: This article proposes a novel dimensionality reduction method called Gaussian feature approximation (GFA) to improve the interpretability and explainability of machine learning for ultrasonic nondestructive evaluation (NDE). GFA is applied to ultrasonic defect sizing and compared with other dimensionality reduction methods and a convolutional neural network. The results show that GFA features achieve similar sizing accuracy to raw images with a significant reduction in input data dimensionality. The GFA-based neural network also exhibits similar relationships between defect indications and predicted size as traditional NDE sizing methods.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2023)
Review
Chemistry, Multidisciplinary
Chengying Yin, Xingyu Jiang, Stephen Mann, Liangfei Tian, Bruce W. Drinkwater
Summary: The high throughput deposition of microscale objects with precise spatial arrangement is crucial in microfabrication technology. The utilization of dynamic acoustic fields offers a contactless approach to real-time reconfigurable miniaturized systems, with potential applications in various fields. This article discusses the physical interactions of microscale objects in an acoustic pressure field, the fabrication of acoustic trapping devices, methods to tune the spatial arrangement, and potential applications in different disciplines.
Article
Materials Science, Characterization & Testing
Sergio Cantero-Chinchilla, Anthony J. Croxford, Paul D. Wilcox
Summary: This paper proposes a data-driven framework for artefact suppression in non-destructive testing data. The framework involves two stages of dimensionality reduction using principal component analysis and an autoencoder. The proposed method effectively suppresses artefacts leading to good defect detection and characterisation performance in an ultrasonic phased-array imaging application.
NDT & E INTERNATIONAL
(2023)
Article
Acoustics
Zubeir M. Ebrahim Saib, Anthony J. Croxford, Bruce W. Drinkwater
Summary: This paper proposes a numerical model using FDTD scheme to solve the nonlinear elastic bulk wave equations, aiming to better understand nonlinear ultrasonic techniques. The model considers material and geometrical nonlinearities and uses a stress-type boundary condition for excitation. Simulation and experimental results validate the effectiveness of the model.
Article
Engineering, Multidisciplinary
Meirbek Mussatayev, Qiuji Yi, Mark Fitzgerald, Vincent K. Maes, Paul Wilcox, Robert Hughes
Summary: Real-time monitoring of carbon fibre composites during Automated Fibre Placement (AFP) manufacturing remains a challenge for non-destructive evaluation (NDE) techniques. This study designed a directional eddy-current (EC) probe to evaluate the detectability of out-of-plane wrinkles. Experimental evaluations and finite element modeling were conducted to better understand the relationship between eddy-current density and defect detection. The findings suggest that the probe configuration with an asymmetric driver coil and differential pickup coils shows the best capability for wrinkle detection.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Acoustics
Zubeir M. Ebrahim Saib, Anthony J. Croxford, Bruce W. Drinkwater
Summary: This paper investigates the effect of the excitation envelope on the generated nonlinear resonant signal for shear and longitudinal wave collinear wave mixing. It explores how to accurately extract the absolute material nonlinearity from any enveloped sinusoidal excitation signal. Experimental results show that Hanning windowed tone burst inputs have lower variance and are suitable for measuring the absolute nonlinearity parameter.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Proceedings Paper
Acoustics
Jing Yang, Emmanuel Cherin, Jianhua Yin, Paul A. Dayton, F. Stuart Foster, Christine E. M. Demore
Summary: This study demonstrates a new method for superharmonic imaging using dual-frequency transducers, and improves imaging frame rate and image quality through plane wave imaging. In vitro and in vivo experiments show effective tissue clutter suppression, providing high-contrast and high-resolution microvasculature imaging.
2022 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IEEE IUS)
(2022)
