All-Optical Ultrasound Transducer Using CNT-PDMS and Etalon Thin-Film Structure

IEEE Photonics Journal

Jeongmin Heo¹  Hui Joon Park²  Hyunmin Yoon³  Geonwook Yoo⁴  Hyoung Won Baac⁵  Junseok Heo⁵  Ujwal Kumar Thakur⁶ 

[1] Comput. Eng., Ajou Univ., Suwon, South Korea;Electr. Eng., Sungkyunkwan Univ., Suwon, South Korea;;Dept. of Electr. &Display Convergence Res. Center, Korea Electron. Technol. Inst., Seongnam, South Korea;Div. of Energy Syst. Res., Ajou Univ., Suwon, South Korea;;Sch. of Electron. &

关键词: Ultrasound transducer;    ultrasound detector;    ultrasound transmitter;    Fabry-Perot interferometer;    carbon nanotube;   

DOI  :  10.1109/JPHOT.2015.2496862

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown