Development and assessment of coupled wave theory of axial propagation in thin-film helicoidal bianisotropic media. Part 1: reflectances and transmittances

Abstract

Abstrac t.T he coupled wave theory (CWT ) for axial propagation of light in dielectric thin-® lm helicoidal bianisotropic media is presented and compared with the full electromagnetic analysis (FEMA). T wo sets of formulas are developed for the location and bandwidth of the wavelength regime wherein the circular Bragg phenomenon is exhibited. Multi-layer structures are also analysed using the CWT , the location of the spectral hole in a class of threelayer structures being determined analytically. Absorption and dispersion e ects are considered.