Ultrasensitive Uv-Tunable Grating In All Solid Photonic Bandgap Fibers
ULTRASENSITIVE UV-TUNABLE GRATING IN ALL SOLID PHOTONIC BANDGAP FIBERS
Source:https://www.bath.ac.uk
We demonstrate ultra-high sensitivity of a long period grating’s resonance wavelength to refractive index changes in an all-solid photonic bandgap fiber. A long period grating is mechanically imprinted in an all-solid photonic bandgap fiber with Germanium doped silica high-index rods in a lower-index silica background. The index of the high index rods is modified through UV exposure, and we observe a sensitivity of 21,000 nanometers per refractive index unit with a 8.8nm resonance width, leading to detectable changes of refractive index of 3⋅10-6.
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