Photoacoustic signal enhancements from gold nano-colloidal suspensions excited by a pair of time-delayed femtosecond pulses

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

doi:10.1364/OE.25.019497

Photoacoustic signal enhancements from gold nano-colloidal suspensions excited by a pair of time-delayed femtosecond pulses

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

^*Corresponding author for this work

Department of Electrical Engineering

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

10 Scopus citations

Abstract

Photoacoustic signal enhancements were observed with a pair of time-delayed femtosecond pulses upon excitation of gold nanosphere colloidal suspension. A systematic experimental investigation of photoacoustic intensity within the delay time, ∆t = 0 to 15 ns, was carried out. The results revealed a significant enhancement factor of ∼ 2 when the pre-pulse energy is 20-30% of the total energy. Pre-pulse and main pulse energy ratios, E_p⁽¹⁾:E_s⁽²⁾, were varied to determine the optimal ratio that yields to maximum photoacoustic signal enhancement. This enhancement was ascribed to the initial stage of thermalization and bubble generation in the nanosecond time scale. Pre-pulse scattering intensity measurements and numerical finite-difference time-domain calculations were performed to reveal dynamics and light field enchancement, respectively.

Original language	English
Pages (from-to)	19497-19507
Number of pages	11
Journal	Optics Express
Volume	25
Issue number	16
DOIs	https://doi.org/10.1364/OE.25.019497
State	Published - 07 08 2017

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© 2017 Optical Society of America.

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title = "Photoacoustic signal enhancements from gold nano-colloidal suspensions excited by a pair of time-delayed femtosecond pulses",

abstract = "Photoacoustic signal enhancements were observed with a pair of time-delayed femtosecond pulses upon excitation of gold nanosphere colloidal suspension. A systematic experimental investigation of photoacoustic intensity within the delay time, ∆t = 0 to 15 ns, was carried out. The results revealed a significant enhancement factor of ∼ 2 when the pre-pulse energy is 20-30% of the total energy. Pre-pulse and main pulse energy ratios, Ep(1):Es(2), were varied to determine the optimal ratio that yields to maximum photoacoustic signal enhancement. This enhancement was ascribed to the initial stage of thermalization and bubble generation in the nanosecond time scale. Pre-pulse scattering intensity measurements and numerical finite-difference time-domain calculations were performed to reveal dynamics and light field enchancement, respectively.",

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AU - Masim, Frances Camille P.

AU - Hsu, Wei Hung

AU - Liu, Hao Li

AU - Yonezawa, Tetsu

AU - Balčytis, Armandas

AU - Juodkazis, Saulius

AU - Hatanaka, Koji

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N2 - Photoacoustic signal enhancements were observed with a pair of time-delayed femtosecond pulses upon excitation of gold nanosphere colloidal suspension. A systematic experimental investigation of photoacoustic intensity within the delay time, ∆t = 0 to 15 ns, was carried out. The results revealed a significant enhancement factor of ∼ 2 when the pre-pulse energy is 20-30% of the total energy. Pre-pulse and main pulse energy ratios, Ep(1):Es(2), were varied to determine the optimal ratio that yields to maximum photoacoustic signal enhancement. This enhancement was ascribed to the initial stage of thermalization and bubble generation in the nanosecond time scale. Pre-pulse scattering intensity measurements and numerical finite-difference time-domain calculations were performed to reveal dynamics and light field enchancement, respectively.

AB - Photoacoustic signal enhancements were observed with a pair of time-delayed femtosecond pulses upon excitation of gold nanosphere colloidal suspension. A systematic experimental investigation of photoacoustic intensity within the delay time, ∆t = 0 to 15 ns, was carried out. The results revealed a significant enhancement factor of ∼ 2 when the pre-pulse energy is 20-30% of the total energy. Pre-pulse and main pulse energy ratios, Ep(1):Es(2), were varied to determine the optimal ratio that yields to maximum photoacoustic signal enhancement. This enhancement was ascribed to the initial stage of thermalization and bubble generation in the nanosecond time scale. Pre-pulse scattering intensity measurements and numerical finite-difference time-domain calculations were performed to reveal dynamics and light field enchancement, respectively.

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Photoacoustic signal enhancements from gold nano-colloidal suspensions excited by a pair of time-delayed femtosecond pulses

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