A high-frequency, 2-D array element using thermoelastic expansion in PDMS

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

doi:10.1109/tuffc.2003.1235327

Cited by 48 publications

(37 citation statements)

References 44 publications

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“…Given the brevity of the excitation light pulses, the bandwidth of the transmitted ultrasound was likely limited by attenuation within the composite coating. Indeed, high ultrasound attenuation in carbon nanotube-PDMS coatings were noted previously [10], and attenuation as high as 23 dB at 100 MHz was observed with a 25 µm composite comprising carbon black and PDMS [28]. The bandwidth of transmitted ultrasound may also have been limited by the coherent addition of ultrasound waves at different depths within the optically absorbing film.…”

Section: Discussionmentioning

confidence: 69%

Broadband miniature optical ultrasound probe for high resolution vascular tissue imaging

Colchester

Zhang

Mosse

et al. 2015

Biomed. Opt. Express

105

136

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An all-optical ultrasound probe for vascular tissue imaging was developed. Ultrasound was generated by pulsed laser illumination of a functionalized carbon nanotube composite coating on the end face of an optical fiber. Ultrasound was detected with a Fabry-Pérot (FP) cavity on the end face of an adjacent optical fiber. The probe diameter was < 0.84 mm and had an ultrasound bandwidth of ~20 MHz. The probe was translated across the tissue sample to create a virtual linear array of ultrasound transmit/receive elements. At a depth of 3.5 mm, the axial resolution was 64 µm and the lateral resolution was 88 µm, as measured with a carbon fiber target. Vascular tissues from swine were imaged ex vivo and good correspondence to histology was observed.

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Section: Discussionmentioning

confidence: 69%

Broadband miniature optical ultrasound probe for high resolution vascular tissue imaging

Colchester

Zhang

Mosse

et al. 2015

Biomed. Opt. Express

105

136

View full text Add to dashboard Cite

show abstract

“…A 2D array of ultrasound transducers can be the solution to the above limitations of a mechanically scanned single element ultrasound transducer. Recent studies have shown the utility of 2D array transducers for ultrasound and photoacoustic 5,13,14 imaging. Also, the water cuvette used in the current setup can be eliminated using an integrated probe with a detection film and a 2D ultrasonic transducer incorporated together.…”

Section: Discussionmentioning

confidence: 99%

“…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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“…Carbon-PDMS composites have been shown to exhibit strong acoustical attenuation [17], despite the small weight fractions that are typically used. In this work, broadband acoustical characterisation of composites comprising carbon nanotubes (CNT) and PDMS was performed using an optical ultrasound generator fabricated of the same material.…”

Section: Introductionmentioning

confidence: 99%

Acoustical characterisation of carbon nanotube-loaded polydimethylsiloxane used for optical ultrasound generation

Alles

Heo

Noimark

et al. 2017

2017 IEEE International Ultrasonics Symposium (IUS)

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Abstract-An optical ultrasound generator was used to perform broadband (2 − 35 MHz) acoustical characterisation measurements of a nanocomposite comprising carbon nanotubes (CNT) and polydimethylsiloxane (PDMS), a composite that is commonly used as optical ultrasound generator. Samples consisting of either pure PDMS or CNT-loaded PDMS were characterised to determine the influence of CNTs on the speed of sound and power-law acoustic attenuation parameters. A small weight fraction (< 1.8%) of added CNTs was found to yield a prominent increase in the exponent of the power law, resulting in a significant increase in acoustic attenuation at higher frequencies. The speed of sound was found to be nearly identical, however. These results could prove useful in the numerical modelling and design of future optical ultrasound sources based on CNT-loaded PDMS.

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A high-frequency, 2-D array element using thermoelastic expansion in PDMS

Cited by 48 publications

References 44 publications

Broadband miniature optical ultrasound probe for high resolution vascular tissue imaging

Broadband miniature optical ultrasound probe for high resolution vascular tissue imaging

Photoacoustic technique to measure beam profile of pulsed laser systems

Acoustical characterisation of carbon nanotube-loaded polydimethylsiloxane used for optical ultrasound generation

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