Detecting Various Chemical Samples and Cancer Cells With a Bio-Chemical Sensor By Using LNOI Based Optical Micro Ring Resonator (OMRR)

Abstract

In this work, we design a bio-chemical sensor based on Optical Micro Ring Resonator (OMRR) by using the feature of Lithium Niobate (LiNbO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> ) on Insulator (LNOI) to sense the various concentrations of Sodium Chloride (NaCl), sucrose, and glucose in water as well as different cancer cells. Some conventional methods that are used in laboratories and industries to detect the different bio and chemical samples are expensive, slow, and waste a large volume of samples. Recently, OMRR has become very popular for sensing applications to overcome those limitations of conventional sensing methods as it is compact, robust, and cheaper. Furthermore, LNOI has some particular properties; these are photorefractive, favorable optics, piezoelectric, and photoelastic properties. In the early stages, we implemented different geometric structures of LNOI based OMRR in COMSOL to perform the mode of analysis. After that, we designed ring resonators in Opti-FDTD using the associated information of geometric structures from COMSOL to evaluate the achievement of this bio-chemical sensor. Our proposed design is found for the rib height, rib width, thickness of LiNbO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> , ring radius, and space between waveguide and ring of 0.56 µm, 0.5 µm, 0.16 µm, 15 µm, and 80 nm, respectively. Simulation results prove that this bio-chemical sensor design shows better Quality (Q) factor, high sensitivity, sharp peak at resonance wavelength, and low transmission output.