Effects of loss factors on zero permeability and zero permittivity gaps in 1D photonic crystal containing DNG materials

TL;DR

This paper theoretically investigates how electric and magnetic loss factors influence zero permeability and zero permittivity gaps in 1D photonic crystals with DNG materials, revealing their simultaneous appearance regardless of incidence angle.

Contribution

It demonstrates that electric and magnetic losses cause zero-mu and zero-epsilon gaps to appear together, contradicting previous reports and showing their dependence on loss factors and incidence angle.

Findings

Zero-mu and zero-epsilon gaps appear simultaneously with losses.

Gaps occur at both normal and oblique incidence.

Increasing losses and incidence angle widens the gaps.

Abstract

The effects of electric and magnetic loss factors on zero-mu and zero-epsilon gaps in a one-dimensional lossy photonic crystal composed of double-negative and double-positive materials are theoretically investigated by employing the characteristic matrix method. This study contradicts the previous reports as it indicates that by applying the inevitable factors of electric and magnetic losses to the double-negative material, the zero-mu and zero-epsilon gaps appear simultaneously in the transmission spectrum, being independent of the incidence angle and polarizations. Moreover, the results show that these gaps appear not only for an oblique incidence but also in the case of normal incidence, and their appearance at the normal incidence is directly related to the magnetic and electric loss factors. Besides, the results indicate that as the loss factors and angle of incidence increase, the width of both gaps also increases.