Journal
IEEE SENSORS LETTERS
Volume 2, Issue 1, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LSENS.2017.2784482
Keywords
Electromagnetic wave sensors; refractive index sensitivity; grating-assisted directional coupler; strip waveguide; propagation loss
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We propose a refractive index sensor, based on grating-assisted directional coupler, by comprising two coupled asymmetric strip waveguides with a top-loaded grating structure. We have studied variation of the sensitivity with the waveguide parameters to optimize the design of the sensor. The proposed sensor is an on-chip device with a high refractive index sensitivity of similar to 10(4) nm/RIU with +/- 140 nm fabrication tolerance, which is more than two times higher than the reported work, and the sensor can also achieve the ultrahigh sensitivity similar to 10(5) nm/RIU with the fabrication tolerance +/- 13 nm. The sensor has large dynamic range from refractive index 1.0 to 1.55. We have also studied the propagation loss due to side wall roughness of the strip waveguide and found that it does not significantly affect sensor performance.
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