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A novel humidity sensor based on power leakage at resonance wavelength in a reduced graphene oxide coated hollow core fiber is demonstrated. The reduced graphene oxide is deposited on the outer surface of the hollow core fiber, and a Fabry–Perot resonator is formed in the cladding region. The leaky mode of the guided light can be achieved at resonant wavelength of the Fabry–Perot resonator, which...
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