Abstract
To realize the design of a medical sensor with excellent comprehensive performance indexes, herein, a plasma concentration sensing model satisfying the Parity-Time (PT) symmetric condition is proposed. In this paper, the transfer matrix method was used to simulate the transmittance spectrum of the structure, according to the amplification effect on defect mode transmission and various detection performance indexes of the structure. We numerically optimized the parameters of the structure, such as the number of PT-symmetry unit cell N, the sample layer thickness dD as well as the macroscopic Lorentz oscillation intensity α in the PT-symmetry unit cell. The calculation results demonstrate that when the sample concentration changes from 0 g/L to 50 g/L, the wavelength of defect peak shifts from 1538 nm to 1561 nm, and the average quality factor, sensitivity, average figure of merit, average detection limit and average resolution of the structure can reach 78,564, 0.4409 nm/(g/L) (or 227.05 nm/RIU), 11,515 RIU−1, 5.1 × 10−6 RIU and 0.038 g/L, respectively. Not only the sensitivity and resolution of the PT-symmetry structure are better than that of the similar sensors, but it also has excellent comprehensive detection performance, which indicates that the developed sensor can be used in high-precision biomedical detection devices.
Highlights
Compared with traditional sensors, optical sensors can accurately detect signal changes in a variety of complex environments due to the tiny size, high accuracy and strong anti-interference ability, which can be extensively used in many fields such as medicine, national defense, industrial as well as agricultural production [1,2,3,4,5,6,7]
Different types of photonic crystal sensors have been designed based on the theory of photonic crystal [8,9,10,11,12]
In order to effectively utilize the amplification effect of the structure, the photonic forbidden band is symmetrically distributed about the central wavelength λ0 = 1550 nm and the initial thickness of each dielectric layer is adjusted as dA = dB = 1108 nm, dC = 967.3 nm and dD = 2dC, respectively
Summary
Optical sensors can accurately detect signal changes in a variety of complex environments due to the tiny size, high accuracy and strong anti-interference ability, which can be extensively used in many fields such as medicine, national defense, industrial as well as agricultural production [1,2,3,4,5,6,7]. Arafah et al proposed [13] a novel bio-sensing 1D-PC with analytes as the defect layer, obtaining detection methods for different types of cancer cells based on the changes in transmittance and reflectance spectra with the refractive index of analytes. Analogue to the Parity-Time (PT) symmetry theory in quantum mechanics, when the refractive index of the gain-loss dielectric layer in the optical structure satisfies the even symmetry of the real part and the odd symmetry of the imaginary part, the structure will satisfy the PT-symmetry condition [16] Under this condition, novel optical transmission modes will be produced [17,18,19]. Due to the defect mode amplification effect produced by the PT-symmetry structure, our sensor model has excellent comprehensive detection performance. According to its sensing mechanism, it can provide a wider range of applications
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