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The dark multipolar spoof localized surface plasmons resonances are observed in a hybrid structure consisting of a corrugated metallic disk and a bright C-shaped resonator. The multipole has a higher Q-value than the dipole resonance.
We investigate the terahertz super-focusing by designing a novel plasmonic lens consisted of Archimedes spiral air array and a concentric groove. A focal spot with FWHM of almost 0.38λ under right circular polarized light (CPL) illumination is achieved. More important, the intensity of focal spot is about 2 times than that of the conventional in-plane plasmonic lens. In addition, we also propose an...
We experimentally and theoretically investigate the Gouy phase shift of the longitudinal terahertz (THz) wave in the entire focal region. By comparing the pulses shape and orientation before and after the focus, we find that the complete Gouy shift for the longitudinal field components is same to that of the transverse field components, with the value of π. The only different between them is their...
We propose three kinds of ultra-broadband terahertz (THz) perfect absorbers by fabricating gratings on heavily boron-doped silicon substrate. By optimizing the doping density, the absorption bandwidths are 1 THz, 1.5 THz, and 2.0 THz, respectively, with absorbance above 95%. The fundamental principles are mainly attributed to the antireflection effects, the grating diffractions and the air gap-mode...
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