structurally chiral medium based biosensors for blood ‎plasma detection

In this work, structurally chiral medium (scm) based biosensors for the detection of blood ‎plasma are designed and theoretically investigated. to do that, the scm with the 42m point ‎group symmetry is considered. the introduced structure is irradiated with circularly ‎polarized light. a photonic bandgap is observed in the transmission and reflection ‎spectrum, which represents the circular bragg phenomenon. the sensor consists of a sample ‎layer located between two identical scms. sensor performance is evaluated using a ‎transfer matrix method (tmm). the results show that the defect mode is sensitive to any ‎changes in the refractive index of the defect layer when the defect layer is infiltrated with ‎different samples of blood plasma. we show a sensitivity of 108.88 nm/riu when the ‎applied sample thickness is 700 nm. the proposed structure is compact in size, easy to build, ‎cost-effective. and it can provide real-time blood plasma biosensors.‎