The near-zero-index metamaterials (NZIMs) have been extensively studied in recent years. In this letter, we show that a
NZIM can be achieved in metallic nanostructures in Mid-IR region. The structure is composed of parallel metal stripes
arrays, so it can be easily fabricated. By scaling the dimensions of the structure, the effect can be tuned over a large
bandwidth. Analysis is carried out to study the influence of the NZIM on infrared transmission in 28.3THz (10.6μm).
The multilayer homogeneous medium model is employed based on the effective medium theory. Additionally, the
theoretical analysis also provides a new method of determining the effective thickness of metamaterials, which is usually
complicated. The results suggest that the ratio of the amplitude after the light beam propagates through the NZIM to that
before it is about 80%, and there is a negative variation in the phase of the light transmitted through the NZIM, which is
in agreement with numerical simulation. Simulation also indicates that there is a strong enhancement of the electric field
between the metal stripes arrays, which plays an important role in the phase delay. This metamaterial has the potential to
be used in some devices such as in waveguides.
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