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Optically excited nanoscale ultrasonic transducers.
Richard J Smith1, Fernando Perez Cota1, Leonel Marques1
1Electrical Systems and Optics Research Division, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom.
The Journal of the Acoustical Society of America
|January 26, 2015
Summary
This study introduces novel GHz ultrasonic transducers, enabling higher resolution imaging. Optical activation and readout eliminate wiring, allowing integration directly into samples for reduced signal loss.
Area of Science:
- Materials Science
- Acoustics
- Optics
Background:
- Higher ultrasonic frequencies are needed for increased imaging resolution.
- Traditional piezoelectric transducers face limitations with wiring and sample integration.
Purpose of the Study:
- To present a novel ultrasonic transducer design.
- To enable operation at GHz frequencies and very small sizes.
- To explore optical activation and readout methods.
Main Methods:
- Fabrication of small-scale (micrometer to sub-micron) ultrasonic transducers.
- Utilizing simultaneous optical and mechanical resonances for energy coupling.
- Optical activation and readout using pulsed lasers without physical contact.
Main Results:
- Demonstrated GHz frequency operation of ultrasonic transducers.
- Showcased optical coupling of laser input into ultrasonic waves and vice versa.
- Observed environmental and loading effects on transducer resonant frequency, including with protein samples.
Conclusions:
- The developed optical ultrasonic transducers overcome limitations of traditional piezoelectric devices.
- These transducers are suitable for in-situ measurements and integration within samples.
- The technology holds promise for advanced imaging and sensing applications.
