نتایج جستجو برای: terahertz emitters
تعداد نتایج: 17467 فیلتر نتایج به سال:
The ability to manipulate the electric-field vector of broadband terahertz waves is essential for applications technologies in many areas, and can open up new possibilities nonlinear spectroscopy coherent control. Here, we propose a novel laser-driven emitter, consisting metasurface-patterned magnetic multilayer heterostructures. Such hybrid emitters combine advantages spintronic being ultrabro...
In this work we developed an extension to the Transfer Matrix method (TMM) include a current source term, with aim of describing both transmission and emission THz pulses in spintronics emitters. The TMM is derived from Maxwell equations volume free term. This allows for study realistic emitters as multilayers different materials thicknesses. We use prove that, spite common misconception, drop ...
We report the generation mechanism associated with nano-grating electrode photomixers fabricated on Fe-doped InGaAsP substrates. Two different emitter designs incorporating nano-gratings coupled to the same broadband antenna were characterized in a continuous-wave terahertz (THz) frequency system employing telecommunications wavelength lasers for generation and coherent detection. The current-v...
We report on the occurrence of sharp Fano resonances in planar terahertz metamaterials by introducing a weak asymmetry in a two gap split ring resonator. As the structural symmetry of the metamaterial is broken a Fano resonance evolves in the low-frequency flank of the symmetric fundamental dipole mode resonance. This Fano resonance can have much higher Q factors than that known from single gap...
BACKGROUND The need for practical and adaptable terahertz sources is apparent in the areas of application such as early cancer diagnostics, nondestructive inspection of pharmaceutical tablets, visualization of concealed objects. We outline the operation principle and suggest the design of a simple appliance for generating terahertz radiation by a system of nanoobjects - gold nanobars (GNBs) or ...
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