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Ultrafast photothermal and photoacoustic phenomena and their applications
The Journal of the Acoustical Society of America, 1996Photothermal techniques have been applied to investigate various physical and chemical phenomena occurring both in homogeneous systems like liquid solutions and in heterogeneous systems like surfaces and interfaces of opaque materials. It is expected that improvement of the temporal resolution in observing photothermal phenomena will provide a new ...
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Ultrafast Photoacoustic Imaging and its Application to Real-Time 3D Imaging with Improved Focusing
Ultrasonic Imaging, 2011The restricted temporal resolution of photoacoustic imaging due to limited frame rates often prohibits its applications in areas such as real-time 3D imaging. This paper presents an ultrasound/photoacoustic multimodality imaging system that provides an ultrafast frame rate and consists of an ultrasound transducer array with plane wave excitation and a
Yu-Hsin, Wang, Pai-Chi, Li
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Ultrasonics
A high-precision nanoscale characterization technology for multilayer films is critical in microelectronics, optoelectronics and bio-medicine. Ultrafast photoacoustic technology provides non-contact structural profiling with sub-nanometer resolution. In this study, an advanced scheme combining ultrafast photoacoustic method and Artificial Intelligence (
Zhiheng Chen +9 more
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A high-precision nanoscale characterization technology for multilayer films is critical in microelectronics, optoelectronics and bio-medicine. Ultrafast photoacoustic technology provides non-contact structural profiling with sub-nanometer resolution. In this study, an advanced scheme combining ultrafast photoacoustic method and Artificial Intelligence (
Zhiheng Chen +9 more
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Ultrafast photoacoustic assessment of mechanical properties in InAs nanowires
2022Nanowires (NWs) have been at the forefront of research in nanoscience for over two decades because of the wide range of applications driven by their peculiar properties [1]. Among the latter, mechanical properties play a crucial role in view of any device development, but, despite the effort, a clear understanding is still lacking [2]. We report [3] on
Diego, Michele +13 more
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High‐Efficiency Photoacoustic Microscopy for Ultrafast Hemodynamic Imaging
Laser & Photonics ReviewsAbstractUnderstanding brain functions requires visualization of cerebral hemodynamics with a high spatiotemporal resolution. Recent advances utilize various scanning schemes to promote the imaging speed of photoacoustic microscopy for label‐free hemodynamic imaging.
Wei Qin +7 more
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Ultrafast measurement of photoacoustic parameters with mid-infrared frequency comb transients
Optics LettersThe photoacoustic (PA) effect has been widely used in various applications, including highly sensitive spectroscopy and label-free, non-invasive imaging. In this work, we demonstrate a fast and precise measurement of PA parameters for light-absorbing liquids using mid-infrared asynchronous sampling pump-probe measurements.
Hyunmin Jang +3 more
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Optics Communications, 2016
Ultrafast optical nonlinearity in chitosan (CS) films doped with multi-walled boron nitride nanotubes (MWBN) has been investigated using 800 nm, 100 fs laser pulses, employing the open aperture Z-scan technique. Two-photon absorption coefficients (β) of CS–MWBN films have been measured at 800 nm by Z-scan.
Narayanan Kuthirummal +4 more
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Ultrafast optical nonlinearity in chitosan (CS) films doped with multi-walled boron nitride nanotubes (MWBN) has been investigated using 800 nm, 100 fs laser pulses, employing the open aperture Z-scan technique. Two-photon absorption coefficients (β) of CS–MWBN films have been measured at 800 nm by Z-scan.
Narayanan Kuthirummal +4 more
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Photons Plus Ultrasound: Imaging and Sensing 2016, 2016
Gold and silver plasmonic nanoparticles (NPs) are widely used as a contrast agent for photoacoustic (PA) imaging, taking advantage of the strong optical absorption cross-section of these particles due to their localized surface-plasmon resonance. Inspired by recent developments in ultra-high frequency wide-bandwidth transducers, we propose utilizing ...
Ali Hatef +4 more
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Gold and silver plasmonic nanoparticles (NPs) are widely used as a contrast agent for photoacoustic (PA) imaging, taking advantage of the strong optical absorption cross-section of these particles due to their localized surface-plasmon resonance. Inspired by recent developments in ultra-high frequency wide-bandwidth transducers, we propose utilizing ...
Ali Hatef +4 more
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SPIE Proceedings, 2012
Co-registered Ultrasound and Photoacoustic images provide complimentary structure and functional information for cancer diagnosis and assessment of therapy response. In SPIE Photonics West 2011, we reported a system that acquires from 64 channels and displays up to 1 frame per second (fps) ultrasound pulse-echo images, 5 fps photoacoustic images ...
Umar Alqasemi +4 more
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Co-registered Ultrasound and Photoacoustic images provide complimentary structure and functional information for cancer diagnosis and assessment of therapy response. In SPIE Photonics West 2011, we reported a system that acquires from 64 channels and displays up to 1 frame per second (fps) ultrasound pulse-echo images, 5 fps photoacoustic images ...
Umar Alqasemi +4 more
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Ultrafast Photoacoustic and Optical Imaging for Vascular and Neural Dynamics
Optica Biophotonics Congress 2025This presentation introduces two ultrafast imaging techniques for visualizing vascular and neural dynamics. One captures real-time three-dimensional vascular structures, while the other visualizes rapid neural signal propagation.
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