Photoacoustic effect measurement in aqueous suspensions of gold nanorods caused by low-frequency and low-power near-infrared pulsing laser irradiation

When aqueous suspensions of gold nanorods are irradiated with a pulsing laser (808 nm), pressure waves appear even at low frequencies (pulse repetition rate of 25 kHz). We found that the pressure wave amplitude depends on the dynamics of the phenomenon. For fixed concentration and average laser curr...

Full description

Saved in:
Bibliographic Details
Published in:Applied optics (2004) 2013-07, Vol.52 (19), p.4698-4705
Main Authors: López de Pablo, Cristina Sánchez, Ramos Ávila, Julio Alberto, Fernández Cabada, Tamara, del Pozo Guerrero, Francisco, Serrano Olmedo, José Javier
Format: Article
Language:English
Subjects:
Acoustics
Amplitudes
Cell Line, Tumor
Cell Survival - radiation effects
Equipment Design
Gold - chemistry
Humans
Lasers
Light
Low-Level Light Therapy
Metal Nanoparticles - chemistry
Nanotubes - chemistry
Pressure
Spectroscopy, Near-Infrared - methods
Ultrasonics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:When aqueous suspensions of gold nanorods are irradiated with a pulsing laser (808 nm), pressure waves appear even at low frequencies (pulse repetition rate of 25 kHz). We found that the pressure wave amplitude depends on the dynamics of the phenomenon. For fixed concentration and average laser current intensity, the amplitude of the pressure waves shows a trend of increasing with the pulse slope and the pulse maximum amplitude. We postulate that the detected ultrasonic pressure waves are a sort of shock waves that would be generated at the beginning of each pulse, because the pressure wave amplitude would be the result of the positive interference of all the individual shock waves.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.52.004698