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. 2019 Feb 4;9:1395. doi: 10.1038/s41598-019-38554-2

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Water tank experimental setup, (b) rotational angular misalignment, (c) axial angular misalignment, (d) I–V characteristics at transmitted ultrasonic intensity of 185 mW/cm², (e) input acoustic intensity vs. µLight activation response, (f) non-reflected ultrasound propagation across the frontal region of the transmitter (g–i) ultrasound propagation profiles seen on XY, YZ, and XZ planes, (j) light irradiance of μLight222, red at various vertical/transverse distances and angles, (k) light irradiance of μLight242, red at various vertical/transverse distances and angles, (l) light irradiance of μLight242, blue at various vertical/transverse distances and angles.