Slowing light has arisen increasing attentions due to its applications
for optical switching, optical hard disk and memories. Among several systems to
potentially demonstrate the slowing light effect, such as electromagnetic induced
transparency (EIT), metamaterial analogue EIT, left-handed waveguides, foremost is
the three-layered left-handed waveguides (LHWG). Therefore, by using a negative
refraction index medium (NRIM) operated at multiple-angle incidences to construct
an LHWG, herein we experimentally demonstrate the effect of slowing light by
activating the oscillatory mode at certain frequency. Our results confirmed by
introducing E-field (or H-field) distribution and power flow recording in CST
simulation software.
The concept of negative refraction promises to rewrite the electromagnetic textbooks due to its corresponding
unprecedented properties including inverse Snell's law, inverse Doppler shift, and inverse Cherenkov radiation. Recently,
the first demonstration of negative refractive index media (NRIM) was realized by D.R. Smith et al. who integrated two
respective sets of sub-wavelength resonant structures (i.e., plasmonic wires and split-ring resonators) to exhibit negative
electric permittivity and magnetic permeability simultaneously. More recently, other resonant structures made of a single
set of unit cells also suggested negative refraction phenomena, enabling to ease the fabrication. Yet, all those resonant
structures behave anisotropically and thereby, currently it is still challenging to realize negative refraction for different
exciting incidences such as grazing-angle and normal incident configurations. In this paper, we design and simulate a
monolithic set of double-layer resonant structures not only possessing negative refraction, but also simultaneously
responding to both grazing-angle and normal incident excitations within microwave region. In accordance with the
results of S-parameter simulation and the retrieved material properties, we clearly observe two allowed narrow bands to
indicate the existence of pseudo-isotropic NRIM (PINRIM). Our results show that the designed monolithic set of
double-layer structures can extensively broaden the valuable applications of negative refraction owing to its
pseudo-isotropic response.
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