Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/32513
Title: Optically excited nanoscale ultrasonic transducers
Authors: Smith, RJ
Cota, FP
Marques, L
Chen, X
Arca, A
Webb, K
Aylott, J
Somekh, MG 
Clark, M
Issue Date: 2015
Publisher: Acoustical Society of America
Source: Journal of the Acoustical Society of America, 2015, v. 137, no. 1, p. 219-227 How to cite?
Journal: Journal of the Acoustical Society of America 
Abstract: In order to work at higher ultrasonic frequencies, for instance, to increase the resolution, it is necessary to fabricate smaller and higher frequency transducers. This paper presents an ultrasonic transducer capable of being made at a very small size and operated at GHz frequencies. The transducers are activated and read optically using pulsed lasers and without physical contact between the instrumentation and the transducer. This removes some of the practical impediments of traditional piezoelectric architectures (such as wiring) and allows the devices to be placed immediately on or within samples, reducing the significant effect of attenuation which is very strong at frequencies above 1 GHz. The transducers presented in this paper exploit simultaneous optical and mechanical resonances to couple the optical input into ultrasonic waves and vice versa. This paper discusses the mechanical and optical design of the devices at a modest scale (a few £gm) and explores the scaling of the transducers toward the sub-micron scale. Results are presented that show how the transducers response changes depending on its local environment and how the resonant frequency s
URI: http://hdl.handle.net/10397/32513
ISSN: 0001-4966
EISSN: 1520-8524
DOI: 10.1121/1.4904487
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