Abstract
Metamaterial structure based on cascaded split ring resonators (CSRR) is proposed in order to produce a negative refractive index in terahertz regime at near-infrared range. We have incident light horizontally instead of incidenting it perpendicular. We have measured the negative refractive index, permeability and permittivity by using the S-parameter analysis. Furthermore, it is found out that negative refractive index, permeability and permittivity are dependent upon the width of the wire and the gap between resonators at near-infrared range. This work will be helpful for the fabrication and design of double negative metamaterials structure having negative permeability, permittivity and negative refractive index for in plane applications.
Highlights
Negative refractive index (NRI) is the main focus point of current research
The effective refractive index neff and the effective wave impedance zeff can be calculated from the effective permittivity εeff and an effective permeability μeff is used to describe the propagation of a wave through the metamaterial
We have studied a metamaterial structure for an in plane light propagation and studied its optical properties at near-infrared range
Summary
As compared to photonic crystals, which retain a periodicity in the order of the wavelength, the size and the distance of the distinct presence in metamaterials are subwavelength. This permits to define the optical response. This is an equivalence to wave propagation in conventional materials, where the interaction of an electromagnetic wave with a group of atoms or molecules is defined by permittivity ε and the permeability μ. The effective refractive index neff and the effective wave impedance zeff can be calculated from the effective permittivity εeff and an effective permeability μeff is used to describe the propagation of a wave through the metamaterial
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