Abstract
Violet light sensing of a micro fiber (MF) with cladding of titanium dioxide (TiO2) nanoparticles on the tapered region is demonstrated in this paper. The absorption characteristics of TiO2 can be tuned by violet light illumination. Significantly enhanced interaction between the propagating light and the TiO2 nanoparticles can be obtained via strong evanescent field coupling from the MF. Experimental results reveal that the transmitted optical power of the MF increases with an ~3 dB relative variation in broadband (1520-1620 nm) operation when the violet light is illuminated onto the TiO2 with power ranging from 0 mW to 11 mW. The device has a sensitivity of ~0.28 dB/mW (1520 nm), which indicates that the TiO2 holds great potential in photonic applications such as fiber-optic sensors or controlled devices.
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