Experimental and numerical verification of microplasma assembly for novel electromagnetic media

Abstract

Microplasmas have a number of potential roles to control propagating electromagnetic waves. This report focuses on novel physics of periodic microplasma assembly for electromagnetic media, which is verified by experimental results and analyzed by numerical methods. Using an assembly composed of microplasmas, novel functions are expected due to its complex dielectric function arising from dielectric and lossy properties. The dielectric property creates photonic band gaps, and the lossy property drastically changes transmittance around the photonic band gaps, leading to an attenuation gap. As a result, a "complex" dispersion relation or a band diagram in the three-dimensional space of real and imaginary wavenumbers and wave frequency will open new possibilities to control electromagnetic waves by complex-variable filters composed of microplasma assemblies.

A novel, all-dielectric, microwave plasma generator towards development of plasma metamaterials

“…8) In 2014, split-ring resonators, previously utilized in some of the first metamaterial structures, 4) were used to generate an array of plasmas, which could perhaps be used as a plasma photonic crystal=metamateri-al. 9,10) One may consider the previously mentioned device as an instance of a metamaterial generated by another metamaterial. However, it has also been shown that metamaterials, in this case, for negative refraction, could be made completely of dielectrics, and from this, we drew inspiration.…”

Polarization-independent circulator based on ferrite and plasma materials in two-dimensional photonic crystal

“…The plasma can be obtained by parallel-plate dielectric barrier excitation, multicapillary electrode discharging, cold cathode fluorescent lamp discharging, gas discharging, and so on. Also, heavily doped semiconductor materials can be regarded as plasma materials 25 , 43 – 46 . It is noted that plasma materials have been used for bandgap devices 22 , 25 , PhC waveguides 44 and PhC filters 45 in theory and experiment where characteristic parameters of some plasma materials can be found.…”

“…Also, heavily doped semiconductor materials can be regarded as plasma materials 25 , 43 – 46 . It is noted that plasma materials have been used for bandgap devices 22 , 25 , PhC waveguides 44 and PhC filters 45 in theory and experiment where characteristic parameters of some plasma materials can be found. When an external magnetic field is applied, the magnetized plasma becomes anisotropic, dispersive, and dissipative, which depends mainly on the external magnetic fields.…”

Experimental and Theoretical Characterization of Plasma Metamaterials

“…One of them is tunability of the parameters. As we reported previously [6], ε is adjustable to an arbitrary value on the complex ε plane with 0 ) Re( < ε , using variable electron density e n and discharge gas pressure p . Another is a dynamic (time-varying) behavior.…”

“…Before the proposal of their concept [9], we performed a series of associated researches on "plasma photonic crystals" [6,7]; in such structures, microplasmas are periodically aligned and band gaps form due to their spatial periodicity, which verifies that plasmas can work as controllers of electromagnetic waves. After these results on the effects of the spatial periodicity, theoretical fundamentals of plasma metamaterials were described in Ref.…”