Interaction of surface acoustic waves and ultraviolet light in ZnO films

Parmanand Sharma, Sanjeev Kumar, K. Sreenivas

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


The frequency response of a 37 MHz bulk LiNbO3 surface acoustic wave (SAW) filter with a 200-nm-thick ZnO overlayer exhibited a downshift in the frequency with ultraviolet (UV) light due to acoustoelectric interactions between the photo-generated carriers in the semiconducting ZnO and the surface acoustic waves. In contrast, a 36 MHz ZnO thin film SAW delay-line with insulating ZnO films exhibited an upshift in the frequency. The response was more pronounced at higher harmonics (130-315 MHz) and was attributed to changes in the elastic/dielectric properties in the upper surface layer of ZnO. A linear change in the frequency with UV intensity shows immense applicability for wireless ultraviolet sensor applications.

Original languageEnglish
Pages (from-to)545-548
Number of pages4
JournalJournal of Materials Research
Issue number3
Publication statusPublished - 2003 Mar


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