title: Compact optical curvature sensor with a flexible microdisk laser on a polymer substrate.
abstract: 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.
authors.affiliation: Research Center for Applied Sciences (RCAS), Academia Sinica, Taiwan. mhshih@gate.sinica.edu.tw
authors.forename: M H
authors.initials: MH
authors.lastname: Shih
authors.forename: K S
authors.initials: KS
authors.lastname: Hsu
authors.forename: Wan
authors.initials: W
authors.lastname: Kunag
authors.forename: Y C
authors.initials: YC
authors.lastname: Yang
authors.forename: Y C
authors.initials: YC
authors.lastname: Wang
authors.forename: S K
authors.initials: SK
authors.lastname: Tsai
authors.forename: Y C
authors.initials: YC
authors.lastname: Liu
authors.forename: Z C
authors.initials: ZC
authors.lastname: Chang
authors.forename: M C
authors.initials: MC
authors.lastname: Wu