Enhanced photoacoustics from gold nano-colloidal suspensions under femtosecond laser excitation

Frances Camille P. Masim; Hao Li Liu; Matteo Porta; Tetsu Yonezawa; Armandas Balčytis; Saulius Juodkazis; Wei Hung Hsu; Koji Hatanaka

doi:10.1364/OE.24.014781

Enhanced photoacoustics from gold nano-colloidal suspensions under femtosecond laser excitation

Frances Camille P. Masim, Hao Li Liu, Matteo Porta, Tetsu Yonezawa, Armandas Balčytis, Saulius Juodkazis, Wei Hung Hsu, Koji Hatanaka

Department of Electrical Engineering

Research output: Contribution to journal › Journal Article › peer-review

21 Scopus citations

Abstract

Enhanced photoacoustic (PA) intensity from gold nanosphere and nanorod colloidal suspensions in water under tightly-focused femtosecond pulsed laser irradiation was systematically investigated. PA signal amplitudes were measured by ultrasound transducers at frequencies of 5, 10, and 25 MHz. The experimental results revealed a linear-dependence of the relative photoacoustic amplitude on the laser power and the mechanism was attributed to non-radiative relaxation dynamics of surface plasmon oscillations. When gold nanorod with longitudinal absorption/extinction peak at 800 nm coincides with the wavelength of femtosecond laser pulses, the most efficient PA signal is generated. Laser excitation was kept within a thermal stability region of gold nanoparticles, i.e., colloidal suspension can be continuously reused for PA generation.

Original language	English
Pages (from-to)	14781-14792
Number of pages	12
Journal	Optics Express
Volume	24
Issue number	13
DOIs	https://doi.org/10.1364/OE.24.014781
State	Published - 27 06 2016

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© 2016 Optical Society of America.

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title = "Enhanced photoacoustics from gold nano-colloidal suspensions under femtosecond laser excitation",

abstract = "Enhanced photoacoustic (PA) intensity from gold nanosphere and nanorod colloidal suspensions in water under tightly-focused femtosecond pulsed laser irradiation was systematically investigated. PA signal amplitudes were measured by ultrasound transducers at frequencies of 5, 10, and 25 MHz. The experimental results revealed a linear-dependence of the relative photoacoustic amplitude on the laser power and the mechanism was attributed to non-radiative relaxation dynamics of surface plasmon oscillations. When gold nanorod with longitudinal absorption/extinction peak at 800 nm coincides with the wavelength of femtosecond laser pulses, the most efficient PA signal is generated. Laser excitation was kept within a thermal stability region of gold nanoparticles, i.e., colloidal suspension can be continuously reused for PA generation.",

author = "Masim, {Frances Camille P.} and Liu, {Hao Li} and Matteo Porta and Tetsu Yonezawa and Armandas Bal{\v c}ytis and Saulius Juodkazis and Hsu, {Wei Hung} and Koji Hatanaka",

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doi = "10.1364/OE.24.014781",

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T1 - Enhanced photoacoustics from gold nano-colloidal suspensions under femtosecond laser excitation

AU - Masim, Frances Camille P.

AU - Liu, Hao Li

AU - Porta, Matteo

AU - Yonezawa, Tetsu

AU - Balčytis, Armandas

AU - Juodkazis, Saulius

AU - Hsu, Wei Hung

AU - Hatanaka, Koji

PY - 2016/6/27

Y1 - 2016/6/27

N2 - Enhanced photoacoustic (PA) intensity from gold nanosphere and nanorod colloidal suspensions in water under tightly-focused femtosecond pulsed laser irradiation was systematically investigated. PA signal amplitudes were measured by ultrasound transducers at frequencies of 5, 10, and 25 MHz. The experimental results revealed a linear-dependence of the relative photoacoustic amplitude on the laser power and the mechanism was attributed to non-radiative relaxation dynamics of surface plasmon oscillations. When gold nanorod with longitudinal absorption/extinction peak at 800 nm coincides with the wavelength of femtosecond laser pulses, the most efficient PA signal is generated. Laser excitation was kept within a thermal stability region of gold nanoparticles, i.e., colloidal suspension can be continuously reused for PA generation.

AB - Enhanced photoacoustic (PA) intensity from gold nanosphere and nanorod colloidal suspensions in water under tightly-focused femtosecond pulsed laser irradiation was systematically investigated. PA signal amplitudes were measured by ultrasound transducers at frequencies of 5, 10, and 25 MHz. The experimental results revealed a linear-dependence of the relative photoacoustic amplitude on the laser power and the mechanism was attributed to non-radiative relaxation dynamics of surface plasmon oscillations. When gold nanorod with longitudinal absorption/extinction peak at 800 nm coincides with the wavelength of femtosecond laser pulses, the most efficient PA signal is generated. Laser excitation was kept within a thermal stability region of gold nanoparticles, i.e., colloidal suspension can be continuously reused for PA generation.

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Enhanced photoacoustics from gold nano-colloidal suspensions under femtosecond laser excitation

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