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A new optical state is described both analytically and numerically at theboundary of a chiral medium with continuous helical symmetry of the dielectrictensor. The tangential wave number is assumed to be zero. The state appears tobe localized near the boundary. It does not transfer energy along this boundaryand falls off exponentially with the distance from the boundary. The fieldpenetration into chiral medium is blocked at wavelengths close to the helicalpitch and corresponding to the photonic band gap. The polarization of lightnear the boundary has the same sign of chirality as the helical medium. It isshown that the homogeneous environment, or the substrate must exhibit theanisotropic metallic reflection. Spectral manifestation of the state isdetermined by the angle between the optical axes at the interface. A realisticexample is considered at the boundary of a cholesteric liquid crystal and ametal-dielectric anisotropic nanocomposite.

Chiral optical Tamm states at the boundary of the medium with helical symmetry of the dielectric tensor [In Russian]