High-frequency ultrasound array element using thermoelastic expansion in an elastomeric film

Buma, Takashi; Spisar, M.; O’Donnell, Matthew

doi:10.1063/1.1388027

Cited by 125 publications

(83 citation statements)

References 7 publications

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“…4 PDMS was chosen since it has a high thermal expansion coefficient, and researchers have already demonstrated the photoacoustic generation of high-frequency, broadband ultrasound signals using PDMS films. 4,5 Briefly, a 10:1 mixture of the PDMS prepolymer and curing agent, carbon black dye ͑1% by weight͒, and toluene ͑2% by weight͒ were thoroughly mixed. The carbon black dye was added to the mixture to elevate the optical absorption of the PDMS film, and the mixture was degassed in a vacuum chamber.…”

Section: Methodsmentioning

confidence: 99%

Photoacoustic technique to measure beam profile of pulsed laser systems

Mallidi

Emelianov

2009

Review of Scientific Instruments

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The beam profiles of pulsed lasers are currently measured using either complementary metal oxide semiconductor ͑CMOS͒ or charge coupled device ͑CCD͒ cameras. Despite providing high-resolution beam profiles, these devices cannot work with high power lasers. If additional optical attenuators are used, beam distortions may occur. In this paper we demonstrate a high-resolution photoacoustic technique capable of measuring the beam profile of pulsed lasers. The beam profiles of a pulsed neodymium-doped yttrium aluminium garnet ͑Nd:YAG͒ laser and a pulsed optical parametric oscillator ͑OPO͒ laser system were measured using a polydimethylsiloxane film and a single element high-frequency ultrasonic transducer. The advantages and limitations of the developed photoacoustic technique are discussed.

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Section: Methodsmentioning

confidence: 99%

Photoacoustic technique to measure beam profile of pulsed laser systems

Mallidi

Emelianov

2009

Review of Scientific Instruments

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“…The measured quantity in this application is the time of flight. Furthermore, it has been used as broadband acoustic source in pulse-echo ultrasound imaging [15,16], also in combination with PA imaging, using either piezoelectric films [17,18] or an optical micro-ring for sound detection [19].…”

Section: Introductionmentioning

confidence: 99%

Hybrid photoacoustic and ultrasound section imaging with optical ultrasound detection

Nuster

Schmitner

Wurzinger

et al. 2013

Journal of Biophotonics

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Journal of BIOPHOTONICSA setup is proposed that provides perfectly co-registered photoacoustic (PA) and ultrasound (US) section images. Photoacoustic and ultrasound backscatter signals are generated by laser pulses coming from the same laser system, the latter by absorption of some of the laser energy on an optically absorbing target near the imaged object. By measuring both signals with the same optical detector, which is focused into the selected section by use of a cylindrical acoustic mirror, the information for both images is acquired simultaneously. Co-registered PA and US images are obtained after applying the inverse Radon transform to the data, which are gathered while rotating the object relative to the detector. Phantom experiments demonstrate a resolution of 1.1 mm between the sections of both imaging modalities and a inplane resolution of about 60 mm and 120 mm for the US and PA modes, respectively. The complementary contrast mechanisms of the two modalities are shown by images of a zebrafish.Result of the dual-modality section imaging experiment on a zebrafish. Scale bar: 1 mm. The first row shows the photoacoustic (PA) and the laser ultrasound (LUS) section image. The second row shows the fusion image (FI) and the histological section.

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“…Photoacoustic material response has also been explored as an optically-controlled source of sound waves: for example, photoacoustic sources have been fabricated from lithographically-defined nanostructures, thin films, multilayer polymer-metal composites, nanoparticle-filled epoxies, and carbon nanotubes [3][4][5][6][7] . In this work, we discuss a simple and low-cost technology for air-coupled photoacoustic ultrasound generation based on DLA films.…”

Section: Introductionmentioning

confidence: 99%

Photoacoustic ultrasound sources from diffusion-limited aggregates

Patel

Brubaker

Kotlerman

et al. 2016

Applied Physics Letters

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Metallic diffusion-limited aggregate (DLA) films are well-known to exhibit near-perfect broadband optical absorption. We demonstrate that such films also manifest a substantial and relatively material-independent photoacoustic response, as a consequence of their random nanostructure. We theoretically and experimentally analyze photoacoustic phenomena in DLA films, and show that they can be used to create broadband aircoupled acoustic sources. These sources are inexpensive and simple to fabricate, and work into the ultrasonic regime. We illustrate the device possibilities by building and testing an optically-addressed acoustic phased array capable of producing virtually arbitrary acoustic intensity patterns in air.

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High-frequency ultrasound array element using thermoelastic expansion in an elastomeric film

Cited by 125 publications

References 7 publications

Photoacoustic technique to measure beam profile of pulsed laser systems

Photoacoustic technique to measure beam profile of pulsed laser systems

Hybrid photoacoustic and ultrasound section imaging with optical ultrasound detection

Photoacoustic ultrasound sources from diffusion-limited aggregates

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