Polymer Bragg waveguide ultrasound detectors

Vishnupriya Govindan, Shai Ashkenazi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Polymer Bragg Grating Waveguides (BGW) are demonstrated as ultrasound detectors. The device is fabricated by direct electron beam lithography technique using SU-8 as the core material with grating features fabricated on the side walls of the rib waveguide. The main motivation for this design is the linear geometry of the device, which can be used in a linear array facilitating high frequency ultrasound imaging. The fabricated BGW device has a grating periodicity of 530 nm and the grating length is 500 μm. The device is tested for optical resonance spectrum. The BGW device is characterized both optically and acoustically. The BGW device is experimentally demonstrated for the detection of ultrasound waves emitted by a 25 MHz transducer. Detection sensitivity depends on optimal grating design for a steep resonance. The results demonstrate the potential use of BGW devices in highly compact array of optoacoustic detectors for high sensitivity ultrasound detection and photoacoustic imaging.

Original languageEnglish (US)
Title of host publicationPhotons Plus Ultrasound
Subtitle of host publicationImaging and Sensing 2011
DOIs
StatePublished - May 5 2011
EventPhotons Plus Ultrasound: Imaging and Sensing 2011 - San Francisco, CA, United States
Duration: Jan 23 2011Jan 25 2011

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume7899
ISSN (Print)1605-7422

Conference

ConferencePhotons Plus Ultrasound: Imaging and Sensing 2011
CountryUnited States
CitySan Francisco, CA
Period1/23/111/25/11

Keywords

  • Bragg gratings
  • Resonance
  • Ultrasound

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