Reactive Mesogen based cholesteric films create optical reflection through molecular order rather than a continuous metal coating. When RMs are combined with a chiral component and aligned into a helical structure, the film behaves as a so called bragg-reflector: selected wavelengths are reflected by a Bragg-type mechanism, while other wavelengths are transmitted.

The reflected wavelength is governed primarily by the helix pitch and the refractive-index contrast of the material.

A uniform helical pitch produces a relatively defined reflection band. For a broader, more mirror-like optical appearance, the film can be designed with a distribution of pitches - for example, through a pitch gradient, multiple layers or other controlled structural variations. These approaches can extend the reflected wavelength range while retaining the lightweight, polymer-based nature of the coating. Appearance & efficiency depend on the helix handedness, illumination and viewing geometry.

The technology can be engineered for different spectral regions, including selected parts of the visible and near-infrared ranges. The accessible range depends on the Reactive Mesogen formulation, chiral chemistry, pitch, refractive indices, film thickness, alignment quality and optical losses. It is therefore more accurate to describe the technology as spectrally designable rather than as reflecting any arbitrary wavelength.

By controlling the photopolymerization conditions, the optical response can be locally defined within the same coated layer. A calibrated UV exposure through a patterned or halftone mask creates variations in the polymer network and, depending on the formulation and process, in the local helix pitch. This enables different areas of one film to reflect different colors or wavelength bands - without separately coating each region. Result: a high-res, digitally configurable optical surface.