Dispersive characteristics of the round optical waveguide with consideration for material chirality

The present-day stage of optics development is characterized by active research of metamaterials and photonic crystals. Constitutive equations are generalized from many cases for such structures and include at least one more defining additional coupling between electric-field vectors of electric and magnetic fields parameter along with inductive capacity and magnetic inductivity. This parameter may determine either the chirality degree or optical activity of medium. In most cases in optics the optical activity effects accounting has weak effect for wave propagation processes and discards for that reason. An attempt to take optical activity into consideration in most cases does not result in significant difference and is typically avoided for that reason. The analysis of optical activity parameter effect on wave propagation in round optical waveguide for determination of classical constitutive equation scope of application and necessity of using more complex forms of constitutive equations is conducted at this work. The crystal optical activity influence on dispersive characteristics of the main mode for round optical fiber is considered in this work. The accurate mathematical model of light wave spreading inside round optical waveguide with consideration for material optical activity was created. The dispersive equation for the main optical eigenmode was derived analytically. In case of absence of optical activity this equation corresponds to generally known dispersive equation for main mode of round optical fiber. Expressions are obtained for the vectors of the electromagnetic field in a circular optical fiber, taking into account the optical activity of the medium. An analysis is made of the dispersion characteristic of an optical waveguide modes for the case of quartz and lithium niobate. The paper shows the necessity of accounting for optical activity at frequencies much higher than the cutoff frequency of each mode.