Near-frequency photons Y-splitter

•Classic Diffractive Optical Elements are not able to Y-split in-air near-frequency photons, while the device we propose redirects in two opposite directions photons differing a few nanometers in wavelength. No metamaterials are used, but just a thin-film of multi-acrylate deposited on a glass-slide.•We developed a theory for this phenomenon that is based on interactions between structured-light and all-dielectric-matter structured-by-light.•Lens effect, based on the difference between the polymerizing-wavelength and the probe-one, is reported. Possibility of multiplexing is demonstrated. We are reporting on a wavelength-controlled anomalous angular light scattering with a very high spatial angular dispersion in correspondence to a very small frequencies range. Essentially, we present a device able to Y-split in-air wavelengths of a laser beam few tens of nanometers away from each other. We explain its working mechanism through Moirè-interactions between structured-light and all-dielectric matter structured by light. More precisely, we ascribe this effect to Moiré-beats between holographic patterns recorded in a material and a spatially modulated wave-front of a probe-beam with slightly different spatial frequency content.