Abstract
Terahertz functional devices are essential to the advanced applications of terahertz radiation in biology and medicine, nanomaterials, and wireless communications. Due to the small size and high plasma frequency of microplasma, the interaction between terahertz radiation and microplasma provides opportunities for developing functional terahertz devices based on microplasma. This paper reviews the applications of microplasma in terahertz sources, terahertz amplifiers, terahertz filters, and terahertz detectors. The prospects and challenges of the interdisciplinary research between microplasma and terahertz technology are discussed.
Highlights
As the thickness of the plasma layer or plasma density increases, both the center frequency of the bandgap and the forbidden bandwidth decrease. These results show the possibility of microplasma photonic crystals for active terahertz filtering, the effects of collision frequency, discharge transient process, and the interaction between adjacent microplasma cells are ignored
A narrow stopband at the center frequency of 157 GHz with a bandwidth demonstrated that the microplasma photonic crystals served as THz filters are well suited of 1 GHz is observed for the first time
The application of microplasma to THz functional devices from the aspects of terahertz sources, amplifiers, filters, and detectors is reviewed in this work
Summary
With photon energies in the meV range, THz radiation interacts strongly with matters that have characteristic lifetimes in the picosecond range and energetic transitions in the meV range, such as absorption resonances of molecules, chemical reactions, dielectric relaxation and vibrational spectroscopy of liquids, weak collective excitations in solids, and biomolecular collective motions [7] These characteristics make THz radiation a unique tool for numerous applications. From the perspective of dielectrics, microplasma has a nonlinear refractive index and behaves like a metamaterial for THz radiation modulation [15] It has advantages of fast dynamic response, reconfiguration, and adjustability compared to other methods based on the temperature [16], magnetic field [17], and pressure [18].
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