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A liquid filled, low refractive index material inner-coated silica micro-tubehas been proposed and studied as a coupled micro-resonator sensor to greatlyenhance biochemical sensor sensitivity. Its unique coupling phenomenon has beenanalyzed and utilized to boost the refractive index sensitivity of the deviceto 967nm/RIU. Through optimization of the coupling strength between the twomicroresonators, further improvement in refractive index sensitivity up to1100nm/RIU has been achieved. This mode coupling strategy allows us to designrobust, thick-walled micro-tube sensors with ultra-high sensitivity which isuseful in practical biochemical sensing applications.

Sensitivity enhancement in optical micro-tube resonator sensors via mode coupling