2D Plasma Photonic Crystals Research Articles

A New Lattice Boltzmann Scheme for Photonic Bandgap and Defect Mode Simulation in One-Dimensional Plasma Photonic Crystals

A novel lattice Boltzmann method (LBM) with a pseudo-equilibrium potential is proposed for electromagnetic wave propagation in one-dimensional (1D) plasma photonic crystals. The final form of the LBM incorporates the dispersive effect of plasma media with a pseudo-equilibrium potential in the equilibrium distribution functions. The consistency between the proposed lattice Boltzmann scheme and Maxwell’s equations was rigorously proven based on the Chapman–Enskog expansion technique. Based on the proposed LBM scheme, we investigated the effects of the thickness and relative dielectric constant of a defect layer on the EM wave propagation and defect modes of 1D plasma photonic crystals. We have illustrated that several defect modes can be tuned to appear within the photonic bandgaps. Both the frequency and number of the defect modes could be tuned by changing the relative dielectric constant and thickness of the defect modes. These strategies would assist in the design of narrowband filters.

Equivalent Circuit Model for One-Dimensional Plasma Photonic Crystals

Plasma photonic crystals (PPCs) is promising metamaterial for electromagnetic wave transmission, due to its superior performance and broad application prospects. However, the design of plasma photonic crystals with adjustable structural parameters is one of the main issues limiting its commercial application. We propose a new method to use the equivalent circuit model to quickly analyze the electromagnetic wave propagation characteristics of 1D PPC. The 1D PPCs structure was constructed with vacuum discharge tube, and we found that the experiment is consistent with the simulation. The research results provide theoretical guidance for the design and optimization of microwave segment multi-channel filters and dynamic microwave devices.

Investigation of unidirectional ultra-wideband absorption in the one-dimensional plasma photonic crystals with Thue-Morse sequence

In this work, the properties of tunable unidirectional ultra-wideband absorption for one-dimensional (1D) plasma photonic crystals (PPCs) with the Thue-Morse sequence are theoretically investigated, which consist only of eight plasma layers with two different plasma frequencies. The computed results show that whether the incident electromagnetic wave is the TM wave or the TE wave, the unidirectional ultra-wideband absorption can be observed in the proposed 1D PPCs, and the largest relative bandwidths of unidirectional absorption regions (UARs) for TM and TE waves are 128.31% and 64.16%, respectively. To study the performance of UARs, the effects of the parameters of such PPCs on the UAR are also discussed. The obtained results indicate that the tuning effects of the incident angle on the UARs for TM and TE waves are different, but similar trends of UARs for TM and TE waves can be observed when the plasma frequency and filling factor are changed, respectively.

Properties of unidirectional absorption in one-dimensional plasma photonic crystals with ultra-wideband

In this paper, the properties of tunable unidirectional absorption in one-dimensional (1D) plasma photonic crystals (PPCs) are theoretically investigated by the transfer matrix method. The PPCs are composed of dielectric layers and non-magnetized and magnetized plasma layers. The simulated results show that a unidirectional ultra-wideband absorption region (absorption rate is larger than 0.9) whose relative bandwidth is 36.2% can be obtained in the proposed 1D PPCs. The effects of the parameters of such PPCs on the features of the unidirectional absorption region (UAR) are also studied. The computed results illustrate that the obtained UARs can be tuned by those parameters as mentioned above, and also show us an alternative way to realize the reconfigurable unidirectional applications in the 1D PPCs.

Light trapping and circularly polarization at a Dirac point in 2D plasma photonic crystals

Light trapping at the Dirac point in 2D plasma photonic crystal has been obtained. The new localized mode, Dirac mode, is attributable to neither photonic bandgap nor total internal reflection. It exhibits a unique algebraic profile and possesses a high-Q factor resonator of about 105. The Dirac point could be modulated by tuning the filling factor, plasma frequency and plasma cyclotron frequency, respectively. When a magnetic field parallel to the wave vector is applied, Dirac modes for right circularly polarized and left circularly polarized waves could be obtained at different frequencies, and the Q factor could be tuned. This property will add more controllability and flexibility to the design and modulation of novel photonic devices. It is also valuable for the possibilities of Dirac modes in photonic crystal containing other kinds of metamaterials.

Properties of obliquely incident electromagnetic wave in one-dimensional magnetized plasma photonic crystals

Properties of obliquely incident electromagnetic wave in one-dimensional (1D) magnetized plasma photonic crystals (PPCs) are studied in this paper. Based on the continuous boundary condition of electromagnetic wave in 1D PPC, transfer matrix equation and dispersion equation of transverse magnetic polarization are deduced, and the properties of dispersion and transmission relation in terms of external magnetic field, collision frequency, and dielectric constant of dielectric and incident angles are investigated, respectively. Results show that gap location and gap width can be effectively controlled by adjusting external magnetic field as well as incident angle, and increasing collision frequency has little effect on gap width while larger dielectric constant of dielectric leads to more gaps.