A laser ultrasound transducer using carbon nanofibers–polydimethylsiloxane composite thin film

The photoacoustic effect has been broadly applied to generate high frequency and broadband acoustic waves using lasers. However, the efficient conversion from laser energy to acoustic power is required to generate acoustic waves with high intensity acoustic pressure (>10 MPa). In this study, we demonstrated laser generated high intensity acoustic waves using carbon nanofibers–polydimethylsiloxane (CNFs-PDMS) thin films. The average diameter of the CNFs is 132.7 ± 11.2 nm. The thickness of the CNFs film and the CNFs-PDMS composite film is 24.4 ± 1.43 μm and 57.9 ± 2.80 μm, respectively. The maximum acoustic pressure is 12.15 ± 1.35 MPa using a 4.2 mJ, 532 nm Nd:YAG pulsed laser. The maximum acoustic pressure using the CNFs-PDMS composite was found to be 7.6-fold (17.62 dB) higher than using carbon black PDMS films. Furthermore, the calculated optoacoustic energy conversion efficiency K of the prepared CNFs-PDMS composite thin films is 15.6 × 10−3 Pa/(W/m2), which is significantly higher than carbon black-P...

[1]  Zhen Xu,et al.  Carbon-Nanotube Optoacoustic Lens for Focused Ultrasound Generation and High-Precision Targeted Therapy , 2012, Scientific Reports.

[2]  P. Yock,et al.  Intravascular ultrasound: novel pathophysiological insights and current clinical applications. , 2001, Circulation.

[3]  C. Mosse,et al.  Laser-generated ultrasound with optical fibres using functionalised carbon nanotube composite coatings , 2014 .

[4]  D. Menichelli,et al.  Efficient laser-ultrasound generation by using heavily absorbing films as targets , 2001, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[5]  R. J. von Gutfeld,et al.  Laser‐generated MHz elastic waves from metallic‐liquid interfaces , 1979 .

[6]  Matthew O'Donnell,et al.  Optical generation of high frequency ultrasound using two-dimensional gold nanostructure , 2006 .

[7]  Ming Han,et al.  Distributed fiber-optic laser-ultrasound generation based on ghost-mode of tilted fiber Bragg gratings. , 2013, Optics express.

[8]  Y. Okumura,et al.  Mechanism of Tissue Heating During High Intensity Focused Ultrasound Pulmonary Vein Isolation: Implications for Atrial Fibrillation Ablation Efficacy and Phrenic Nerve Protection , 2008, Journal of cardiovascular electrophysiology.

[9]  Matthew O'Donnell,et al.  Broadband all-optical ultrasound transducers , 2007 .

[10]  Pai-Chi Li,et al.  All-optical scanhead for ultrasound and photoacoustic imaging—Imaging mode switching by dichroic filtering☆ , 2014, Photoacoustics.

[11]  Y. H. Kim,et al.  Reduced graphene oxide coated thin aluminum film as an optoacoustic transmitter for high pressure and high frequency ultrasound generation , 2012 .

[12]  Xiaotian Zou,et al.  Fiber-optic ultrasound generator using periodic gold nanopores fabricated by a focused ion beam , 2013 .

[13]  Matthew O'Donnell,et al.  High-frequency ultrasound array element using thermoelastic expansion in an elastomeric film , 2001 .

[14]  Tao Ling,et al.  Carbon nanotube composite optoacoustic transmitters for strong and high frequency ultrasound generation. , 2010, Applied physics letters.

[15]  T. Reess,et al.  Experimental and numerical study of shock wave propagation in water generated by pulsed arc electrohydraulic discharges , 2014 .

[16]  Robert Nuster,et al.  Hybrid photoacoustic and ultrasound section imaging with optical ultrasound detection , 2013, Journal of biophotonics.

[17]  Pai-Chi Li,et al.  All-optical scanhead for ultrasound and photoacoustic dual-modality imaging. , 2012, Optics express.

[18]  Dresselhaus,et al.  Thermal conductivity and Raman spectra of carbon fibers. , 1985, Physical review. B, Condensed matter.

[19]  Constantin Coussios,et al.  High intensity focused ultrasound: Physical principles and devices , 2007, International journal of hyperthermia : the official journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group.

[20]  Richard M. White,et al.  Generation of Elastic Waves by Transient Surface Heating , 1963 .

[21]  Yufeng Zhou,et al.  High intensity focused ultrasound in clinical tumor ablation. , 2011, World journal of clinical oncology.