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The boundary conditions of the moving layered medium are analyzed and the expressions of electromagnetic field are deduced. The reflection and transmission coefficients in fixed coordinates are obtained by using the covariance characteristic of Maxwell Equations. It is very complicated to apply boundary conditions many times in analyzing a multi-layer slab. In this paper, the results obtained from the boundary conditions of single-layer slab are analogous with those obtained by the transfer matrix method. Through improvement and generalization, the transfer matrix method can be used to calculate the moving multi-layer slabs. It can be applied to calculate the reflection and transmission coefficients of one-dimensional moving photonic crystal as well as deal with TM and TE polarization for the oblique incident. The zero reflection points of TM and TE polarization for layered slab are calculated. The results calculated in this study are matching well with the reference. It shows that the reflection oscillation enhances with the increase of β and layer number, while the changing rule of reflections about TM polarization is relatively complex. The reflections of both TE wave and TM wave are all related to the incidence angle. [ABSTRACT FROM AUTHOR]

Photonic crystal is a dielectric structure arranged according to certain rules, and its excellent electromagnetic wave characteristics can be used to manufacture a lot of kinds of photonic crystal devices. In this paper, a defect is introduced into the photonic crystal, and the transfer matrix method is used to study the relationship between the liquid concentration and the peak value of the liquid transmission at the electromagnetic wave length when the defect is a mixture of ethanol and glycol. The results show that by observing and measuring the position of the peak transmittance of the mixed liquid, the substance content of the liquid mixture, that is, the concentration, can be inferred. The accuracy of this method is compared with the experimental results, which shows that this method has high accuracy. This method is simple and easy to operate. This result opens up a new direction for the application of photonic crystals. [ABSTRACT FROM AUTHOR]

Abstract: Numerical simulation of interaction between plasma slab and electromagnetic wave which has different incident frequency and incident angle is discussed in this paper. Some parameters contain reflection coefficient, transmission coefficient, reflectance, transmittance and phase are calculated by transfer matrix method. The relation of these parameters with incident frequency and incident angle is analyzed. The results show that the incident angle has low influence on the parameters when the angle varies from 0° to 30° and from 70° to 90°, but it has high influence on the parameters when it changes from 30° to 70°. These rules have certain directive significance to the research of interaction between oblique incidence electromagnetic wave and plasma slab and to the design of plasma layer. [Copyright &y& Elsevier]

The transmission characteristics of electromagnetic wave in a high temperature plasma slab are investigated by using transfer matrix method in this paper. The phenomenon of negative conductivity that emerged from high temperature plasma is investigated. The absorption of high temperature plasma is negative in the corresponding frequency band where the negative conductivity appears. According to the law of energy conservation, the sum of the reflection and transmission of electromagnetic waves in this frequency band will be greater than 1. That is, there should be an anomalous transmission phenomenon. According to the research, anomalous transmission is found in right-handed circular polarizations (RCP), while left-handed circular polarizations (LCP) do not occurred the similar phenomenon. In our study, it shows that the anomalous transmission is affected by external magnetic field, and different external magnetic field corresponding to different transmission frequencies. In the same time, the transmission frequencies move towards high band with the increasing of the magnetic field. Therefore, the negative conductivity and anomalous transmission can be artificial controllable. So, it can be used as a gain medium at a specific frequency or as an effective way to transmit information by frequency selection. [ABSTRACT FROM AUTHOR]

The absorption characteristics of one‐dimensional photonic crystals (1DPC) consisting of an ordinary dielectric and graphene–dielectric hyperbolic metamaterials in terahertz (THz) are theoretically analyzed and numerically simulated using the transfer matrix method. The perfect absorption peaks can be achieved in the structure designed in our research. In the 1DPC, the dielectric layers are embedded into graphene layers and the optical axis of the graphene–dielectric hyperbolic metamaterials is normal to the graphene layers. The graphene–dielectric layers are seen as anisotropic effective medium and possess the properties of hyperbolic dispersion in THz frequency band. The locations of perfect absorptance peaks are dependent on chemical potential, the thicknesses of dielectric layers and the inclined angle. The positions of absorption peaks are blue‐shifted with increasing the chemical potential and red‐shifted by increasing the thicknesses of the dielectric layers. We testified that the orientation of the optical axis of the graphene–dielectric layers has prominent effect on the locations of the perfect absorption peaks. Moreover, multiband absorption peaks can be obtained by introducing more structure as given in our research with different parameters. The controllable perfect absorption achieved at the far infrared ray (FIR) frequencies could be applied in the design of multichannel perfect absorption filters. The absorption characteristics of one‐dimensional photonic crystals consisting of an ordinary dielectric and graphene‐dielectric hyperbolic metamaterials in the terahertz band are theoretically analyzed. Perfect absorption peaks are achieved in the structure. The positions of absorption peaks are adjusted by chemical potential, the thicknesses of dielectric layers and the orientation of the optical axis. Moreover, multiband absorption peaks are obtained in the structure. [ABSTRACT FROM AUTHOR]

In this paper, a plasma photonic crystal (PPC) for infrared radiation modulation which is composed of indium tin oxide (ITO) and plasma is proposed. The performance of plasma photonic crystal in near infrared radiation modulation is researched by transfer matrix method (TMM). The simulation results show that the near infrared radiation pass band can be adjusted by the changing of plasma frequency of plasma. The reflection to near infrared radiation by plasma photonic crystal increases with plasma frequency and that of absorption decreases. In addition, the modulation performance of the plasma photonic crystal at different incidence wave angles is also studied. The results show that the incident wave angles have little effect on the transmission of plasma photonic crystal in near infrared band. The reflection of the plasma photonic crystal to near infrared radiation decreases with increasing of the incident wave angle, but that of the absorption increases with the incident wave angle. Therefore, the proposed plasma photonic crystal has a potential application in tunable near infrared filter devices. Image 1 • A plasma photonic crystal composed of ITO and plasma is proposed. • The performance of PPC in near infrared radiation modulation is researched by TMM. • The near infrared radiation pass band can be adjusted by plasma frequency. • The PPC has a potential application in tunable near infrared filter devices. [ABSTRACT FROM AUTHOR]

Protein is an important representative component of life. Protein concentration and temperature have a very important impact on life. This paper uses the special structure composed of photonic crystals to act on photonic crystals and protein solutions through electromagnetic waves. Using the transfer matrix method, the effects of the concentration and temperature of protein solution on the refractive index and transmittance of protein are analyzed and judged. The variation law is obtained by calculation and analysis. These basic laws are: First, at a certain temperature, the refractive index of protein solution increases approximately linearly with the increase of protein solution concentration. The transmittance of protein solution in photonic crystals is gradually decreasing; Second, when the concentration of protein solution is constant, with the increase of protein solution temperature, the refractive index of protein solution decreases approximately linearly, and the transmittance of protein solution increases gradually in the shape of parabola. The study of these laws provides a certain scientific basis for further applying photonic crystal structure to life science research and explaining the physical laws in biological changes. • Using the special structure composed of photonic crystals to act on photonic crystals and protein solutions through electromagnetic waves. • Using the transfer matrix method, the effects of the concentration and temperature of protein solution on the refractive index and transmittance of protein are analyzed and judged. [ABSTRACT FROM AUTHOR]

• The appearance of solar greenhouse covering material effectively reduces the temperature in the greenhouse and improves the efficiency of solar energy utilization. • A nano-scale material film consisting of the sloped arrangement of the indium tin oxide and metal material is proposed. • The study shows its transmission and reflectivity is good under visible and near infrared light. • The simulation results confirm the material's potential to become a new type of solar greenhouse film. In areas with strong light, the appearance of solar greenhouse covering material effectively reduces the temperature in the greenhouse and improves the efficiency of solar energy utilization, but there are many shortcomings in the material structure of solar greenhouse covering materials, such as low visible light transmittance, low reflectance of near-infrared radiation, poor insulation and so on. Based on the above questions, a nano-scale material film consisting of the sloped arrangement of the indium tin oxide and metal material is proposed, a transfer matrix method is used to study its transmittance and reflectance under visible and near-infrared light. The study finds that the material and structure has more than 93% transmittance in visible light and the reflectance of the near-infrared band is more than 95%. Simulation results confirm the material's potential to become a new type of solar greenhouse film. [ABSTRACT FROM AUTHOR]

A new design for expanding the absorption band of absorber in near-infrared range is theoretically proposed. This design is achieved by a layered cascade metamaterial structure that consists of four metamaterial slabs. A single metamaterial slab is made of a periodic array of tilted metal layers. The results show that the layered cascade structures obviously broaden the widths of the absorption bands. The transfer matrix is derived according to the special properties of the structure designed in the paper, and the absorption of the design is numerically simulated using the transfer matrix method. The influence of structural parameters on the absorption properties of metamaterial layer is analyzed: the locations of the absorption peaks are red-shifted with the increase of the inclination angles of the metal layers and the distance between the metal layers. The positions of the absorption peaks are blue-shifted with the increase of the thicknesses of the metal layers. The widths of the absorption bands increase while the centers of absorption peaks remain the same with the increase of the thicknesses of the metamaterial slabs. According to the above results, the metamaterial slabs which contain similar structural parameters are selected to constitute a layered cascade structure. The absorption of the layered cascade structures is numerically simulated and theoretically analyzed. The simulation results show that the absorption bands are obviously widened and the multi-band absorption peaks are found in the near-infrared region with the superposition of different suitable materials. • A new design for broadening the absorption band of an absorber in the near-infrared range is theoretically proposed. • This design is achieved by a layered cascade metamaterial structure that consists of four metamaterial slabs. • A single metamaterial slab is made of a periodic array of tilted metal layers. • The results show that the layered cascade structures obviously broaden the absorption bands. [ABSTRACT FROM AUTHOR]