Supporting Information

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Fig. 9. Experimental results show magnitude of membrane displacement response at five excitation frequencies, normalized to the input acoustic pressure, for isotropic membrane with 5-cSt fluid (a), orthotropic membrane with 5-cSt fluid (b), isotropic membrane with 20-cSt fluid (c), and orthotropic membrane with 20-cSt fluid (d) . Note that because of optical constraints the entire membrane is not imaged; the data start at 4 mm from the narrow end of the device. Data are presented along the centerline of the membrane. No filtering of any kind is applied to the data before presentation.

Fig. 10. Computational results show magnitude and phase of membrane response at five excitation frequencies for orthotropic membrane with 5-cSt fluid (a and c) and orthotropic membrane with 20-cSt fluid (b and d).