Compact optical curvature sensor with a flexible microdisk laser on a polymer substrate.

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Optics letters, ISSN: 1539-4794, Vol: 34, Issue: 18, Page: 2733-5

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Kuang, Wan; Shih, M. H.; Hsu, K. S.; Yang, Y. C.; Wang, Y. C.; Tsai, S. K.; Liu, Y. C.; Chang, Z. C.; Wu, M. C.
The Optical Society
Physics and Astronomy; Electrical and Computer Engineering
article description
We demonstrate a chip-scale compact optical curvature sensor. It consists of a low threshold InGaAsP microdisk laser on a flexible polydimethylsiloxane polymer substrate. The curvature dependence of lasing wavelength was characterized by bending the cavity at different bending radii. The measurements showed that the lasing wavelength decreases monotonously with an increasing bending curvature. A good agreement between experiment and three-dimensional finite-difference time-domain simulation was also obtained. The sensitivity of the compact device to the bending curvature is -23.7 nm/mm from the experiment.