Design of MTM-Based Multiband Micro-Biosensor in Terahertz Region as Perfect Absorber for Early-Stage Leukemia Diagnosis With Sensitivity 18 626 373 THz/RIU

In this article, a novel highly sensitive biosensor based on perfect metamaterial (MTM) absorbers is presented. A detailed study is presented for several different models, different types of substrate materials, different types of resonant materials, and substrate thicknesses showing very good sensitivity to any changes. The proposed biosensor exhibits high sensitivity to different polarization and incidence angles, ensuring its performance in terms of signal-to-noise ratio (SNR). The proposed biosensor was carefully compared with previously designed sensors and biosensors. The proposed biosensor exhibits amazing sensitivity, such as a quality factor (
${Q}$
-factor) of 41.1, a figure of merit (FOM) of 172 466 416 RIU
$^{-{1}}$
, and a sensitivity (
${S}{)}$
of 18 626 373 THz/RIU. The high sensitivity of the biosensor allows early detection of leukemia, demonstrating significant differences between leukemia and normal blood. Another interesting result of this article is the use of terahertz (THz) waves for imaging. Microwave imaging (MWI) is performed for electric fields, magnetic fields, and power.