Modeling of ultrasound detection by silicon-photonics-based sensors

source: © 2018 Optical Society of America

We develop a simple model for assessing the sensitivity of silicon-photonics ultrasound interferometric detectors for two types of acoustic waves. The sensitivity of the two polarization modes of a waveguide are calculated and experimentally verified. [Read More…]

Fig. 2. (a) Microscope image of the SOI sensor. PMF is polarizationmaintaining fiber (b) Schematic illustration of the interferometric setup. PZ is piezoelectric fiber stretcher; VA is variable attenuator;DL is delay line. For each polarization state, two types of acoustic waves were detected: (c) longitudinal waves in normal incidence and (d) surface acoustic waves created in oblique incidence.

Fig. 3. Measured time-dependent acoustic responses (optical phase shift) for TE (solid) and TM (dashed) waveguide modes, obtained for (a) glass fiber, (b) silicon waveguide with normal incidence and (c) silicon waveguide with surface acoustic waves created in oblique incidence.

S. Tsesses, D. Aronovich, A. Grinberg, E. Hahamovich, and A. Rosenthal, “Modeling of ultrasound detection by silicon-photonics-based sensors,” in Advanced Photonics 2018 (BGPP, IPR, NP, NOMA, Sensors, Networks, SPPCom, SOF), OSA Technical Digest (online) (Optical Society of America, 2018), paper JTu2A.43.