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Versatile and scalable fabrication method for laser-generated focused ultrasound transducers

Authors
  • Aytac-Kipergil, E.
  • Alles, E. J.
  • Pauw, H. C.
  • Karia, J.
  • Noimark, S.
  • Desjardins, A. E.
Type
Published Article
Journal
Optics Letters
Publisher
The Optical Society
Publication Date
Dec 09, 2019
Volume
44
Issue
24
Pages
6005–6008
Identifiers
DOI: 10.1364/OL.44.006005
PMID: 32628218
PMCID: PMC7059213
Source
PubMed Central
License
Unknown

Abstract

A versatile and scalable fabrication method for laser-generated focused ultrasound transducers is proposed. The method is based on stamping a coated negative mold onto polydimethylsiloxane, and it can be adapted to include different optical absorbers that are directly transferred or synthesized in situ . Transducers with a range of sizes down to 3 mm in diameter are presented, incorporating two carbonaceous (multiwalled carbon nanoparticles and candle soot nanoparticles) and one plasmonic (gold nanoparticles) optically absorbing component. The fabricated transducers operate at central frequencies in the vicinity of 10 MHz with bandwidths in the range of 15–20 MHz. A transducer with a diameter of 5 mm was found to generate a positive peak pressure greater than 35 MPa in the focal zone with a tight focal spot of 150 μm in lateral width. Ultrasound cavitation on the tip of an optical fiber was demonstrated in water for a transducer with a diameter as small as 3 mm.

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