The detection of seawater elements by virtual polarizer capable of coherent perfect ultra-wideband polarization control

Abstract

Recently, the significance of monitoring seawater quality has gradually increased due to the sharp increase in marine pollution due to human activities. A virtual polarizer (VP) capable of detecting seawater elements, is proposed in this paper. Coherent perfect polarization control over ultra-wideband can be achieved by manipulating two coherent electromagnetic waves (EWs). The detection of salinity and volume fraction of heavy oil of seawater can be realized by observing the perfectly matched points. Within 18.55 ∼ 23.88 THz, coherent polarization conversion is realized with an extremely high polarization conversion rate, which performs a vital function in controlling the propagation of EWs. Meanwhile, under TM mode, coherent perfect absorption (CPA) is achieved with a high-quality factor, which utilizes phase modulation to enable the detection of seawater algal content, and temperature. Utilizing the fragility of CPA, detecting schemes implemented employing this mechanism enable high sensitivity and low detection errors. In addition, the sensitivity, quality factor, figure of merit, and detection limit will be particularly emphasized by the calculation of the transfer matrix method. As a multifunctional instrument, the VP maintains excellent polarization conversion performance and detecting properties, offering promising applications in antenna sensing and propagation. Furthermore, the proposed VP is only a theoretical study and experimentation is not the focus of this paper.