Characterization of optical microring ultrasound detector by using a high frequency focused photoacoustic transmitter

Hyoung Won Baac, Tao Ling, Sheng Wen Huang, Shai Ashkenazi, L. Jay Guo

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We characterize a response of optical microring resonator to high frequency focused ultrasound. To properly evaluate the response over high frequency and broadband spectrum, we use a photoacoustic concave transmitter generating and subsequently focusing the ultrasound. A detected focused profile reveals two types of spatial peaks due to the special ring-shaped detector geometry interacting with the high frequency focused ultrasound. Spectral analysis shows that those peaks are contributed by the main and the side lobes of focused ultrasound, respectively. Experimental focal widths agree with theoretical values within ±2 μm error, which can be attributed to the narrow width of waveguide.

Original languageEnglish (US)
Article number144105
JournalApplied Physics Letters
Volume95
Issue number14
DOIs
StatePublished - 2009

Bibliographical note

Funding Information:
This work is supported by NIH Grant No. EB007619.

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