Results 141 to 150 of about 745 (158)

Design and implementation of photoacoustic based beam dump-average optical power meter for fast and ultrafast lasers

Optics and Lasers in Engineering, 2021
Abstract We reported a new method for measuring the optical power of fast and ultrafast laser pulses. This type of measurements usually encounters some technical difficulties in field of experimental practice. The method is based on investigating the laser-induced photoacoustics (PA) inside a non- lambertian integrating sphere made of stainless steel.
H.S. Ayoub, Ashraf F. El-Sherif, Sana M.A. Maize, Y.H. Elbashar   +3 more
openaire   +1 more source

Ultrafast measurement of photoacoustic parameters with mid-infrared frequency comb transients

Optics Letters
The 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, Chanseul Lee, Minhaeng Cho, Tai Hyun Yoon   +3 more
openaire   +2 more sources

Ultrafast optical nonlinearity and photoacoustic studies on chitosan–boron nitride nanotube composite films

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, Reji Philip, Athira Mohan, Cassidy Jenks, Nicole Levi-Polyachenko   +4 more
openaire   +1 more source

Ultrafast photoacoustic assessment of mechanical properties in InAs nanowires

2022
Nanowires (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, Gandolfi, Marco, Peli, Simone, Danesi, Stefano, Giannetti, Claudio, Alessandri, Ivano, Zannier, Valentina, Demontis, Valeria, Rocci, Mirko, Beltram, Fabio, Sorba, Lucia, Roddaro, Stefano, Rossella, Francesco, Banfi, Francesco   +13 more
openaire   +1 more source

Ultrafast ultrasound and photoacoustic co-registered imaging system based on FPGA parallel processing

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, Hai Li, Guangqian Yuan, Andres Aguirre, Quing Zhu   +4 more
openaire   +1 more source

Analysis of photoacoustic response from plasmonic nanostructures irradiated by ultrafast laser in water

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, Behafarid Darvish, Adrien Dagallier, Christos Boutopoulos, Michel Meunier   +4 more
openaire   +2 more sources

Computational study of plasma-assisted photoacoustic response from gold nanoparticles irradiated by off-resonance ultrafast laser

Journal of Nanoparticle Research, 2017
The gold nanoparticles (AuNPs) are capable of enhancing the incident laser field in the form of scattered near field for even an off-resonance irradiation where the incident laser wavelength is far away from the localized surface plasmon resonance (LSPR). If the intensity of the pulse laser is large enough, this capability can be employed to generate a
Ali Hatef, Behafarid Darvish, Amir Yousef Sajjadi   +2 more
openaire   +1 more source

Detection of Nanoscale Structural Defects in Degraded Fe-Doped SrTiO₃ by Ultrafast Photoacoustic Waves

The Journal of Physical Chemistry C, 2018
Strontium titanate, SrTiO3, has been intensively investigated as a model material in defect chemistry research. The underlying mechanism of the effects associated with a large variety of defects often requires microstructure imaging. In the present work, the distribution of nanoscale structural defects in electrodegraded Fe-doped SrTiO3 (Fe:STO) single
Ying Zhang, Onur Kurt, David Ascienzo, Qian Yang, Tony Le, Steve Greenbaum, Thorsten J. M. Bayer, Clive A. Randall, Yuhang Ren   +8 more
openaire   +1 more source

Ultrafast Photoacoustic and Optical Imaging for Vascular and Neural Dynamics

Optica Biophotonics Congress 2025
This 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.
openaire   +1 more source

Monitoring thermal evolutions of 2D layered semiconductor/polymer heterostructure with ultrafast photoacoustic spectroscopy

Applied Physics Letters
Utilizing 2D layered semiconductor as ultrafast photoacoustic transducer, we all-optically generate and track the propagation of picosecond acoustic pulses in 2D layered semiconductor/PMMA thin-film heterostructure via femtosecond laser pump-probe. By varying the environmental temperatures and the incident direction of pump laser pulse, the acoustic ...
Feiyang Hou, Yujie Wang, Zhen Yue, He Zhang, Chaoyang Huang, Xiaoxuan Wang, Chunxiang Xu, Qiannan Cui   +7 more
openaire   +1 more source