A novel rhombic shaped photonic crystal bio-sensor for identifying disorders in the blood samples

• Published in: Optical and quantum electronics Vol. 55; no. 4
• Main Authors: Krishnamoorthi, Bhuvaneshwari, Elizabeth Caroline, B., Michael, Margarat, Thirumaran, Sridarshini
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.04.2023; Springer Nature B.V
• Subjects: Biosensors; Blood; Characterization and Evaluation of Materials; Computer Communication Networks; Disorders; Electrical Engineering; Incidence angle; Lasers; Lattice parameters; Leukemia; Optical Devices; Optics; Photonic band gaps; Photonic crystals; Photonics; Physics; Physics and Astronomy; Plane waves; Refractivity; Sensors; Simulation; Time domain analysis; Transmission efficiency; Blood sample; Photonic crystal (PhC); Bio-sensor; Finite difference time domain; Plane wave expansion
• ISSN: 0306-8919; 1572-817X
• DOI: 10.1007/s11082-023-04584-4

In this work, a single and dual rhombic-shaped ring resonator (RR) bio-sensor using 2D photonic crystal (2D-PhC) are designed and simulated with circular Si rods in a square lattice in an air arrangement. The photonic band gap (PBG) of the structure is calculated using plane wave expansion (PWE) method. The simulation and investigation of the bio-sensor structure is carried out using finite-difference time-domain (FDTD) method. The optimized simulation parameters like rod radius, lattice constant, angle of incidence and cavity thickness are 142 nm, 630 nm, 90° and 2 μm respectively. A small change in refractive index (RI) will cause a considerable shift in the resonant wavelength and transmission output. The proposed bio-sensor is capable of analyzing eleven different components of blood based on the RI. Many blood-related disorders such as nutritional deficiency, inflammatory bowel disease (IBD), leukemia, lymphoma and thalassemia can be found using this bio-sensor in less time and with minimum human effort. The average quality factor (QF), sensitivity and transmission efficiency (η) of the bio-sensor are 3702, 166 (nm/RIU) and 80% respectively. This design is instigated for medical applications with a compactness of 515.29 μm 2 .