diffuseja

Diffuseja is a term used in discussions of optical diffusion to denote a regime in which a surface or material scatters incident light into a broad, nearly isotropic distribution, with little to no specular reflection. The concept is used in theoretical treatments and in some speculative design contexts to characterize coatings, textures, or composites that maximize diffuse redistribution of light. The name combines the English word diffuse with a suffix that signals a class of phenomena.

Characteristics include a high diffuse reflectance and controlled transmittance, with the angular luminance following approximately a Lambertian profile over a wide range of wavelengths. Diffuseja behavior can arise from micro- and nano-scale roughness, porosity, or refractive-index inhomogeneities that disrupt coherent reflection and scattering paths.

Common approaches to realize diffuseja-type surfaces involve random textures manufactured by etching or embossing, porous polymer or ceramic coatings, and pigment- or nanoparticle-filled matrices. Such surfaces are used or proposed for lighting diffusers, architectural cladding, display backlights, and protective backsheets for photovoltaic modules, where uniform light distribution is desirable.

Performance considerations include the trade-off between diffusion and transmittance, environmental durability, and the angular dependence of scattering. Diffuseja is one of several models for diffuse lighting behavior, distinct from perfectly Lambertian and highly specular interfaces.

See also: Diffuse reflection, Lambertian reflector, Optical diffuser, Scattering.

References: This entry describes a hypothetical concept used for explanatory purposes.