DocumentCode :
3609697
Title :
All-Optical Ultrasound Transducer Using CNT-PDMS and Etalon Thin-Film Structure
Author :
Geonwook Yoo ; Hyunmin Yoon ; Jeongmin Heo ; Thakur, Ujwal Kumar ; Hui Joon Park ; Hyoung Won Baac ; Junseok Heo
Author_Institution :
Display Convergence Res. Center, Korea Electron. Technol. Inst., Seongnam, South Korea
Volume :
7
Issue :
6
fYear :
2015
Firstpage :
1
Lastpage :
8
Abstract :
Compared with conventional piezoelectric transductions, an all-optical high-frequency ultrasound (HFUS) transducer is a promising modality for high-resolution ultrasound imaging. We demonstrate an all-optical HFUS transducer by integrating a carbon nanotube-polydimethylsiloxane composite film with an etalon thin-film structure incorporating SiO2/TiO2 distributed Bragg reflectors and an SU-8 resonator. The optical and acoustic characteristics are investigated for two different configurations (forward and backward operation modes). The maximum amplitude of the pulse echo in backward mode is approximately twofold higher than that of the forward mode. This difference is contributed by the increased reflectance and the absorptive loss of the incident pulsed laser in the forward mode. The pulse echo from the transducer exhibits a broad frequency bandwidth of 27 MHz. Furthermore, the scalability of the 2-D all-optical transducer array is also evaluated by characterizing the optical properties of the etalon across an area of 0.1 × 0.2 mm2. Our experimental results show that the proposed transducer is a promising candidate for high-resolution ultrasound imaging systems.
Keywords :
Fabry-Perot interferometers; acousto-optical devices; carbon nanotubes; nanophotonics; piezoelectric transducers; silicon compounds; titanium compounds; ultrasonic transducers; CNT-PDMS; HFUS; SU-8 resonator; absorptive loss; all-optical high-frequency ultrasound transducer; backward mode; bandwidth 27 MHz; carbon nanotube-polydimethylsiloxane composite film; distributed Bragg reflectors; etalon thin-film structure; forward mode; pulse echo; reflectance; Optical films; Optical reflection; Optical resonators; Optical transmitters; Transducers; Ultrasonic imaging; Fabry-Perot interferometer; Fabry???P??rot interferometer; Ultrasound transducer; carbon nanotube; ultrasound detector; ultrasound transmitter;
fLanguage :
English
Journal_Title :
Photonics Journal, IEEE
Publisher :
ieee
ISSN :
1943-0655
Type :
jour
DOI :
10.1109/JPHOT.2015.2496862
Filename :
7317488
Link To Document :
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