Abstract
A novel refractive index sensor based on the resonant coupling mechanism is proposed. The sensor consists of a standard index-guiding solid fiber core and several periodically distributed micro fluidic channels. When the channels are infiltrated with high-index fluid, the resonant coupling between the core mode and cladding modes makes the sensing fiber to be a stop-band filter. Since the filtering effect introduced by the photonic band-gap of the cladding is sensitive to the refractive index of the measurand, numerical results reveal that the sensitivity of the sensor could reach 17250nm/RIU, which is much higher than traditional refractive index fiber sensors.
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