期刊
IEEE SENSORS JOURNAL
卷 20, 期 11, 页码 5970-5975出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2020.2974502
关键词
Slot waveguide; refractive index; sensor; on chip; abbe refractometer
资金
- MHRD through NIEIN Project
- MHRD through Sir Visvesvaraya Ph.D. Scheme
- MeitY through NNetRA Project
- DST through NNetRA Project
- SHELL, India
We demonstrate static and dynamic bulk refractive index measurement using slot-waveguide based ring resonator. A detailed simulation is performed to optimize the slot-waveguide geometry for maximum sensitivity. The on-chip measurements are performed using a slot waveguide ring resonator by applying aqueous solutions of acids and bases at different concentrations. Based on these measurements, we derive a relation of refractive index change per unit change in concentration of the liquids in water. We experimentally measured a maximum sensitivity of 476 nm/RIU, enabling a limit of detection (LOD) of ${1.05}\times {10}<^>{-{5}}$ RIU. Finally, we demonstrate dynamic refractive index on-chip measurement by diluting potassium bicarbonate with hydrogen peroxide.
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