Abstract
Background & Objective: In this work, ahydrostatic pressure sensor based on a cavity coupled to a photonic crystal waveguide is proposed. A defect is introducedto createa sharp resonance in the structure which makes it useful for detecting pressure changes. The sensing principle is based on the shift of the resonant wavelength with the change refractive index which arises due to the hydrostatic pressure effect. The proposed structure gives a high sensitivity against wide range of pressures and a good quality factor near 3GPa is achieved.
Conclusion: The proposed design also shows separated resonant peaks for different indicesand a perfect linear relation between the cutoff wavelength and the pressure which offer a possibility of highly selective pressure detection.
Keywords: Cavity-coupled waveguide, microcavity, optical pressure sensor, photonic crystal waveguide, dielectric structure, electromagnetic wave.
Graphical Abstract
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