Biosensors based on novel nonlinear delta-function photonic crystals comprising weak nonlinearities

Abstract

In this research, we propose a novel nonlinear delta-function photonic crystal for detecting sodium iodide (NaI) solution of different concentrations. The suggested structure comprises 50 delta stacks of GaP in an aqueous solution of NaI. These stacks are considered to have weak defocusing nonlinearity in the order of 10−6 (V/m)−2. Due to nonlinearity of the design, a defect-like resonance is formed within the photonic band gap. Thus, the detection of NaI with different concentrations can be easily investigated without the inclusion of a defect through the photonic crystal structure. The effects of both the linear part of the refractive index of GaP layers and nonlinear coefficient on the transmittance value are thoroughly discussed. The numerical findings investigate that the resonant peak begins to split at some critical nonlinearity. In our proposed structure, splitting occurs at about − 12 × 10−6 (V/m)−2. In this regard, the suggested sensor provides a high sensitivity of 409.7 nm/RIU and a wonderful detection limit of 0.0008.

SARS-CoV-2 detecting rapid metasurface-based sensor

“…A temperature and magnetic field detecting sensor based on photonic crystal fiber based structure with high sensitivity [34,35]. Mehaney et al proposed a sodium iodide detecting photonic crystal biosensor [36]. Taha and coauthors presented numerous sensors for heavy metals detection in water [37], and sodium iodide detection [38], and isoprene in exhaled breath [39].…”

Enhancement of absorption in a CH3NH3PbI3-based photonic crystal in the presence of the monolayer MoS2

“…Therefore, they are the important structures for controlling the propagation of light and sensing applications 26 , 27 . Recently, the propagation of electromagnetic waves through photonic crystals, especially photonic crystals based on the 2D materials, has been widely investigated both theoretically and experimentally by researchers and significant results have been obtained 28 – 50 . The optical absorbance of graphene on the one-dimensional photonic crystal has been investigated theoretically by Liu et al 28 The authors showed that, when graphene is placed on the photonic crystal, its absorbance coefficient increases greatly.…”