Fabrication of fiber-optic broadband ultrasound emitters by micro-opto-mechanical technology

Belsito, Luca; Vannacci, E.; Mancarella, F.; Ferri, M.; Veronese, Giulio Paolo; Biagi, E.; Roncaglia, Alessandro

doi:10.1088/0960-1317/24/8/085003

Cited by 20 publications

(8 citation statements)

References 27 publications

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“…A variety of methods have been reported for optical ultrasound transmitter fabrication. These include techniques such as dip-coating, 2,4 spin-coating, 15 chemical vapor deposition, 11,14,16 metal evaporation, 6 and etching 12,17 . Dip-coated and spin-coated absorber-elastomer composites on glass substrates have been implemented for fabrication of carbonaceous optical ultrasound generating surfaces 1,2,16 .…”

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“…These include techniques such as dip-coating, 2,4 spin-coating, 15 chemical vapor deposition, 11,14,16 metal evaporation, 6 and etching. 12,17 Dip-coated and spin-coated absorber-elastomer composites on glass substrates have been implemented for fabrication of carbonaceous optical ultrasound generating surfaces. 1,2,16 Electrospun carbonized polyacrylonitrile nanofibers deposited on macroscale substrates (a flat glass slide and a concave lens) and then spin-coated with PDMS were also reported for laser ultrasound generation.…”

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confidence: 99%

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Optical fiber ultrasound transmitter with electrospun carbon nanotube-polymer composite

Poduval

Noimark

Colchester

et al. 2017

Applied Physics Letters

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All-optical ultrasound transducers are promising for imaging applications in minimally invasive surgery. In these devices, ultrasound is transmitted and received through laser modulation, and they can be readily miniaturized using optical fibers for light delivery. Here, we report optical ultrasound transmitters fabricated by electrospinning an absorbing polymer composite directly onto the end-face of optical fibers. The composite coating consisting of an aqueous dispersion of multi-walled carbon nanotubes (MWCNTs) in polyvinyl alcohol was directly electrospun onto the cleaved surface of a multimode optical fiber and subsequently dip-coated with polydimethylsiloxane (PDMS). This formed a uniform nanofibrous absorbing mesh over the optical fiber end-face wherein the constituent MWCNTs were aligned preferentially along individual nanofibers. Infiltration of the PDMS through this nanofibrous mesh onto the underlying substrate was observed and the resulting composites exhibited high optical absorption (>97%). Thickness control from 2.3 μm to 41.4 μm was obtained by varying the electrospinning time. Under laser excitation with 11 μJ pulse energy, ultrasound pressures of 1.59 MPa were achieved at 1.5 mm from the coatings. On comparing the electrospun ultrasound transmitters with a dip-coated reference fabricated using the same constituent materials and possessing identical optical absorption, a five-fold increase in the generated pressure and wider bandwidth was observed. The electrospun transmitters exhibited high optical absorption, good elastomer infiltration, and ultrasound generation capability in the range of pressures used for clinical pulse-echo imaging. All-optical ultrasound probes with such transmitters fabricated by electrospinning could be well-suited for incorporation into catheters and needles for diagnostics and therapeutic applications.

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Optical fiber ultrasound transmitter with electrospun carbon nanotube-polymer composite

Poduval

Noimark

Colchester

et al. 2017

Applied Physics Letters

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“…Laser ultrasonic emitters are based on the optoacoustic effect and can generate ultra-broadband ultrasonic pulses [1][2]. The optoacoustic effect, also known as photoacoustic effect, consist in the generation of the ultrasonic pulses by an optical absorbing medium that is illuminated by short optical pulses.…”

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confidence: 99%

Laser ultrasound emitter using low cost and compact high power diode laser for ultrasound biomedical imaging

Rodas¹,

Gallego²,

Oraevsky³

et al. 2023

Photons Plus Ultrasound: Imaging and Sensing 2023

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Medical ultrasound is an imaging technique that utilizes ultrasonic signals as information carriers, and has wide applications such as seeing internal body structures and finding the sources of an internal diseases. The most used ultrasonic transducer today is based on piezoelectricity. The piezoelectric transducer, however, may have a limited bandwidth and insufficient sensitivity for reduced element size. In this work we demonstrate the generation of wideband ultrasound pulses using high power diode lasers (HPDLS), short pulsed current sources and composite absorbers. We design and implement the pulsed current sources optimized for the HPDLs. We fabricate candle soot-PDMS composite targets. We have achieved peak pressure of 323 kPa and bandwidths at -6 dB of 34 MHz using a diode laser with an optoacoustics conversion efficiency of 5.3 * 10 -3 Pa/(W/m 2 ). Finally, we present a compact low-cost tunable ultrawideband laser ultrasound emitter.

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“…Existing efforts to generate ultrasound via optical fibers have been focused on using chemical coatings, e.g., gold nanocomposites, 16 or preparing micro-machined attachments for fiber tips. 17 However, the tension achieved via these acoustic emitters is far below the tensile stress needed to induce cavitation.…”

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Photoacoustic shock wave emission and cavitation from structured optical fiber tips

Mohammadzadeh

Gonzalez-Avila

Wan

et al. 2016

Applied Physics Letters

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Photoacoustic waves generated at the tip of an optical fiber consist of a compressive shock wave followed by tensile diffraction waves. These tensile waves overlap along the fiber axis and form a cloud of cavitation bubbles. We demonstrate that shaping the fiber tip through micromachining alters the number and direction of the emitted waves and cavitation clouds. Shock wave emission and cavitation patterns from five distinctively shaped fiber tips have been studied experimentally and compared to a linear wave propagation model. In particular, multiple shock wave emission and generation of strong tension away from the fiber axis have been realized using modified fiber tips. These altered waveforms may be applied for novel microsurgery protocols, such as fiber-based histotripsy, by utilizing bubble-shock wave interaction.

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Fabrication of fiber-optic broadband ultrasound emitters by micro-opto-mechanical technology

Cited by 20 publications

References 27 publications

Optical fiber ultrasound transmitter with electrospun carbon nanotube-polymer composite

Optical fiber ultrasound transmitter with electrospun carbon nanotube-polymer composite

Laser ultrasound emitter using low cost and compact high power diode laser for ultrasound biomedical imaging

Photoacoustic shock wave emission and cavitation from structured optical fiber tips

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