Waveguide optical micromachined ultrasound transducer (WOMUT) for high frequency ultrasound detection

被引：0

作者：

Tadayon, Mohammad Amin ^{[1
]}

Ashkenazi, Shai ^{[1
]}

Baylor, Matha-Elizabeth ^{[2
]}

机构：

[1] Univ Minnesota, Dept Biomed Engn, Minneapolis, MN 55455 USA

[2] Carleton Coll, Dept Phys & Astron, Northfield, MN 55057 USA

来源：

2014 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS) | 2014年

关键词：

Optical micromachined ultrasound transducer; Waveguide Fabry-Perot resonator; Ultrasound detector; OMUT; MHZ;

D O I：

10.1109/ULTSYM.2014.0236

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

We introduce a new method to increase the sensitivity of an optical ultrasound receiver by utilizing a waveguide between the mirrors of the Fabry-Perot resonator. This approach eliminates diffraction loss from the cavity and therefore the finesse is only limited by mirror loss and absorption. Recently, we have reported our measurements of high finesse (695) and quality factor (59000) in a waveguide Fabry-Perot film resonator of 100 mu m thickness. Here we describe the implementation of this method for the design of a thin film ultrasound detector. By applying this method, we have achieved noise equivalent pressure of 178 Pa over a bandwidth of 30 MHz which is 20 folds better than the sensitivity of our previous non-waveguide detector.

引用

页码：963 / 966

页数：4