Journal
SENSORS
Volume 20, Issue 18, Pages -Publisher
MDPI
DOI: 10.3390/s20185306
Keywords
optical sensors; silicon wire; silicon oxynitride (SiON); segmented grating; far field pattern; numerical modeling; finite difference time domain (FDTD) method
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This paper presents results of numerical modeling of a modified design of an optical sensor based on segmented periodic silicon oxynitride (SiON) grating evanescently coupled with silicon wire. This segmented grating works as a leaky waveguide, which filters input power from a broadband optical source and radiates it as an outcoming optical beam with both a small wavelength band and a small beam divergence. The radiation angle strongly depends on the refractive index of the grating environment and provides sensor interrogation by measuring the far field pattern in the focal plane of the lens, which is placed near the sensor element. The device concept was verified by direct numerical modeling through the finite difference time domain (FDTD) method and provided moderate intrinsic limit of detection (iLOD) similar to 0.004 RIU with a possible iLOD similar to 0.001 RIU for 10 mm-long structures.
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