S. Shimada, H. Lee, M. Shizuka, H. Tanaka, N. Hayashi, Y. Matsumoto, Y. Tanaka, H. Nakamura, Y. Mizuno, and K. Nakamura, “Refractive index sensing using ultrasonically crushed polymer optical fibers”, Appl. Phys. Express, vol. 10, no. 1, 012201 (2017).
We demonstrate power-based refractive index (RI) sensing using an ultrasonically crushed polymer optical fiber (POF). This structure can be easily and cost-efficiently fabricated for a short time (i.e., ~1 s) without the need to employ external heat sources or chemicals. The only requirement is to simply press the horn connected to an ultrasonic transducer against part of the POF. The RI dependence of the transmitted power shows linear trends in the RI ranges from ~1.32 to ~1.36 (coefficient: −62 dB/RIU (RI unit)) and ~1.40 to ~1.44 (coefficient: −257 dB/RIU)). The temperature dependence of the transmitted power is also investigated.