Applied Physics Letters · 2003 · 467 citations · 9 references
Photonic SensorEngineeringBiochemical SensorsBiomedical EngineeringBiosensorsMicro-optical ComponentSteep SlopesPhotonic MicroresonatorsNanosensorMicrofluidicsWaveguide OffsetsBiophysicsPlanar Waveguide SensorNanophotonicsPhotonicsBiophotonicsPhotonic DeviceOptical SensorsMicrofabricationWearable BiosensorsOptical Sensor
Photonic microresonators offer highly sensitive sensing due to their high‑Q resonances and steep transmission slopes. The authors propose a microring resonator with steeper slopes by adding two partially reflecting elements via waveguide offsets. Polystyrene microrings were fabricated by nanoimprinting and their optical spectra were measured in glucose solutions of varying concentrations. The design yields a Fano‑resonant line shape that greatly enhances sensitivity, with resonant wavelength shift and transmitted intensity linearly tracking glucose concentration.
Photonic microresonators have great potential in the application of highly sensitive sensors due to high Q-factor resonances and steep slopes between zero and unity transmission. A microring resonator with increased resonance slopes is proposed by introducing two partially reflecting elements implemented by waveguide offsets. This configuration produces a Fano-resonant line shape and can greatly enhance the sensitivity of the sensor. Polystyrene microring resonators were fabricated by the nanoimprinting technique, and the optical spectra were measured in glucose solutions of different concentrations. The shift in resonant wavelength and variation of the normalized transmitted intensity are linearly related to the concentration of the glucose solution.
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Sensitive disk resonator photonic biosensor
Robert W. Boyd, John E. Heebner · Applied Optics · 2001 · 401 citations