Abstract
The paper deals with the sustainment of electromagnetic waves in circularly cylindrical optical guide with chiral nihility and chiral materials in the core and the clad sections, respectively. A perfectly conducting tightly wound helix is introduced at the core‐clad interface. The eigenvalue relation for such a complex optical microstructured guide is deduced by applying suitable boundary conditions at the core‐clad interface, and the dispersion behavior is analyzed by varying the pitch angle of helix. The sustainment of energy flux density in such optical guides is estimated under various structural conditions, and the density patterns in core‐clad sections are anatomized analytically.
Highlights
Due to many exotic electromagnetic characteristics, chiral materials attracted the attention of investigators
One of the interesting properties of chiral metamaterials is having the phenomenon of negative refraction/reflection that can be achieved by increasing the chirality [3, 4], and the applications of such phenomenon are described in [5, 6] as well
We find that the intensities are much increased in this case as compared to the situation of a 0∘ helix pitch angle (Figure 3(a)), and the EH01 mode still occupies the maximum amount of energy density
Summary
Due to many exotic electromagnetic characteristics, chiral materials attracted the attention of investigators. Apart from the electromagnetic analyses of varieties of conventional chirowaveguides, investigations have been reported focusing on the dispersion characteristics and/or the power transmission patterns of various other new forms of waveguide structures embedded with chiral materials [14, 15] These constitute complex mediums, and the wave propagation through such structures would further be governed on demand by the use of twisted clad chiral guides [16]. These twists are in the form of a mounting of conducting sheath helix structure at the core-clad interface—the pitch angle of helix plays the determining role in tuning the dispersion features of the guide [17,18,19,20]. Considering the case of sheath helix with each turn being isolated from the neighboring one, but still the helical winding being continuous, the dispersion behavior of fiber is analyzed under the variation of the angle of pitch of conducting helical twists, which is followed with the determination of energy flux density patterns in the waveguide structure
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