Interaction of surface acoustic waves with ultraviolet light

K. Sreenivas, Sanjeev Kumar, Parmanand Sharma

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Fabrication and functional performance of highly sensitive ultraviolet detectors based on zinc oxide (ZnO) thin film SAW device and a ZnO/LiNbO 3 layered structure is described. A 37 MHz bulk LiNbO3 surface acoustic wave (SAW) filter with a 71 to 200 nm-thick ZnO over layer exhibits a downshift in the frequency with ultraviolet (UV) light due to acoustoelectric interactions between the photo-generated carriers in the semiconducting ZnO over layer and the surface acoustic waves. In contrast, a 36 MHz ZnO thin film SAW delay-line fabricated on a 8 μm thick insulating ZnO film exhibited an upshift in the frequency. A linear change in frequency shift with UV intensity is found useful for the fabrication of wireless UV sensors.

Original languageEnglish
Pages (from-to)69-72
Number of pages4
JournalFerroelectrics
Volume329
DOIs
Publication statusPublished - 2005
Externally publishedYes

Keywords

  • SAW devices
  • Thin films
  • UV detectors
  • ZnO/LiNbO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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