In this work, silicon nitride (Si_3N_4) based fluidically tuned photonic crystal for a biosensingapplication is presented. The optical structure is designed on Si_3N_4 on insulator.The Si_3N_4 on insulator substrate is found to be one of the most promising materials forthe design of bio- sensor at short wavelength. At short wavelength Si_3N_4material is foundto be most promising material for optical integrated circuits. The structure of the sensorconsists of Silicon nitride input and output waveguides separated by a fluidically tunedphotonic crystal. Fluidically tuned photonic crystal acts as a sensing region. Thesensitivity is based on refractive index of fluidically tuned photonic crystal. Theproposed sensor is designed to operate in the visible wavelength range of 660nm.Fluidically tuned photonic crystal consists of rectangular photonic crystal array. Theholes of photonic crystal are approximately 160nm in diameter and height is 200nm.Organic light emitting diode is used as an optical source. OLED is coupled to inputwaveguide. The PDMS microfluidic channel is moulded on the rectangular photoniccrystal structure. The structure is modelled and analysis is carried out by using Lumericalmode solution and Lumerical Finite Difference Time Domain (FDTD) simulation tools.Such devices if fabricated can be employed for early detection of various diseases relatedto pathological parameters.
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