Fiber-optic ultrasound generator using periodic gold nanopores fabricated by a focused ion beam

Tian, Ye; Wu, Nan; Zou, Xiaotian; Felemban, Haitham B; Cao, Chengyu; Wang, Xingwei

doi:10.1117/1.oe.52.6.065005

Cited by 37 publications

(22 citation statements)

References 30 publications

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“…In the study of Tian et al, a pressure amplitude of 2.73 kPa was achieved at a distance of 1.5 mm using a gold nanopore array on the end face of a 62.5 lm core optical fibre. 17 In the study of Baac et al, 18 a peak positive pressure of 22 MPa was measured at the focus of an optical ultrasound transducer that comprised a CNT-PDMS composite on a concave surface 6 mm in diameter and with a fluence of 42.4 mJ/cm 2 . While this pressure was 4.9 times higher than that achieved in this study, it was produced using an effective focal gain of 54.…”

mentioning

confidence: 99%

Laser-generated ultrasound with optical fibres using functionalised carbon nanotube composite coatings

Colchester

Mosse

Bhachu

et al. 2014

Applied Physics Letters

106

109

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Optical ultrasound transducers were created by coating optical fibres with a composite of carbon nanotubes (CNTs) and polydimethylsiloxane (PDMS). Dissolution of CNTs in PDMS to create the composite was facilitated by functionalisation with oleylamine. Composite surfaces were applied to optical fibres using dip coating. Under pulsed laser excitation, ultrasound pressures of 3.6 MPa and 4.5 MPa at the coated end faces were achieved with optical fibre core diameters of 105 and 200 μm, respectively. The results indicate that CNT-PDMS composite coatings on optical fibres could be viable alternatives to electrical ultrasound transducers in miniature ultrasound imaging probes.

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mentioning

confidence: 99%

Laser-generated ultrasound with optical fibres using functionalised carbon nanotube composite coatings

Colchester

Mosse

Bhachu

et al. 2014

Applied Physics Letters

106

109

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“…(ii) A novel Au nanocomposite, synthesized by mixing the AuNPs into PDMS following a one-pot protocol, is dipped coated on a multi-mode fiber with a core diameter of 400 μm to realize a broadband miniature fiber-optic LGUS transmitter [46]. The generated ultrasound has an amplitude of 0.64 MPa and a bandwidth of more than 20 MHz, which are significantly improved compared with the work in Reference [59]. Ultrasound imaging of a tissue sample with the resolution of 200 μm is demonstrated.…”

Section: Fiber-optic Transmittersmentioning

confidence: 99%

“…(i) Fabricated by a focused ion beam technique, highly absorptive Au nanopores can be patterned on the end face of an optical fiber [59]. The miniature LGUS transmitter produces ultrasound with an amplitude of 2.7 kPa and a −3-dB bandwidth of 7 MHz.…”

Section: Fiber-optic Transmittersmentioning

confidence: 99%

“…(i) Through the dissolution of CNTs in PDMS facilitated by functionalization of CNTs with oleylamine, the CNTs-PDMS nanocomposite can be dip coated on optical fibers for efficient LGUS transmission [54]. Figure 4 shows SEM pictures of fiber-optic LGUS transmitters using Au nanopores and CNTs-PDMS in References [54,59], respectively. Strong ultrasound pressure of 3.6 MPa and 4.5 MPa are measured using optical fibers with core diameters of 105 and 200 µm, respectively.…”

Section: Fiber-optic Transmittersmentioning

confidence: 99%

“…2017, 7, 25 19 of 4 [54]. Figure 4 shows SEM pictures of fiber-optic LGUS transmitters using Au nanopores and CNTs-PDMS in References [54,59], respectively. Strong ultrasound pressure of 3.6 MPa and 4.5 MPa are measured using optical fibers with core diameters of 105 and 200 μm, respectively.…”

Section: Fiber-optic Transmittersmentioning

confidence: 99%

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Review of Laser-Generated Ultrasound Transmitters and Their Applications to All-Optical Ultrasound Transducers and Imaging

Chen

2016

Applied Sciences

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Abstract:Medical ultrasound is an imaging technique that utilizes ultrasonic signals as information carriers, and has wide applications such as seeing internal body structures, finding a source of a disease, and examining pregnant women. The most commonly used ultrasonic transducer today is based on piezoelectricity. The piezoelectric transducer, however, may have a limited bandwidth and insufficient sensitivity for reduced element size. Laser-generated ultrasound (LGUS) technique is an effective way to resolve these issues. The LGUS approach based on photoacoustic effect is able to greatly enhance the bandwidth of ultrasound signals and has the potential for high-resolution imaging. High-amplitude LGUS could also be used for therapy to accomplish high precision surgery without an incision. Furthermore, LGUS in conjunction with optical detection of ultrasound allows all-optical ultrasound imaging (i.e., ultrasound is generated and received optically). The all-optical platform offers unique advantages in providing high-resolution information and in facilitating the construction of miniature probes for endoscopic ultrasound. In this article, a detailed review of the recent development of various LGUS transmitters is presented. In addition, a recent research interest in all-optical ultrasound imaging, as well as its applications, is also discussed.

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Polydimethylsiloxane Composites for Optical Ultrasound Generation and Multimodality Imaging

Noimark

Colchester

Poduval

et al. 2018

Adv Funct Materials

102

173

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Polydimethylsiloxane (PDMS) is widely used in biomedical science and can form composites that have broad applicability. One promising application where PDMS composites offer several advantages is optical ultrasound generation via the photoacoustic effect. Here, methods to create these PDMS composites are reviewed and classified. It is highlighted how the composites can be applied to a range of substrates, from micrometer‐scale, temperature‐sensitive optical fibers to centimeter‐scale curved and planar surfaces. The resulting composites have enabled all‐optical ultrasound imaging of biological tissues both ex vivo and in vivo, with high spatial resolution and with clinically relevant contrast. In addition, the first 3D all‐optical pulse‐echo ultrasound imaging of ex vivo human tissue, using a PDMS‐multiwalled carbon nanotube composite and a fiber‐optic ultrasound receiver, is presented. Gold nanoparticle‐PDMS and crystal violet‐PDMS composites with prominent absorption at one wavelength range for pulse‐echo ultrasound imaging and transmission at a second wavelength range for photoacoustic imaging are also presented. Using these devices, images of diseased human vascular tissue with both structural and molecular contrast are obtained. With a broader perspective, literature on recent advances in PDMS microfabrication from different fields is highlighted, and methods for incorporating them into new generations of optical ultrasound generators are suggested.

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Fiber-optic ultrasound generator using periodic gold nanopores fabricated by a focused ion beam

Cited by 37 publications

References 30 publications

Laser-generated ultrasound with optical fibres using functionalised carbon nanotube composite coatings

Laser-generated ultrasound with optical fibres using functionalised carbon nanotube composite coatings

Review of Laser-Generated Ultrasound Transmitters and Their Applications to All-Optical Ultrasound Transducers and Imaging

Polydimethylsiloxane Composites for Optical Ultrasound Generation and Multimodality Imaging

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