In experiments, researchers used a conductor–dielectric–conductor (CDC) Fabry-Pérot cavity.
Fabry–Pérot cavity is basically a sandwich: a layer of dielectric (non-conducting material) between two reflective (or semi-reflective) surfaces. They use silicon nitride (SiN) as the dielectric layer, and thin metal bilayers (Cr/Au) as the conductive layers.
They shine coherent light from both sides (i.e. two laser beams with a controllable phase difference) of CDC material. The structure reveals hidden color information via how much it absorbs light depending on the relative phase.
You can store information (like images, patterns, or codes) in a thin film. The information is invisible under normal light but can be decoded using coherent, phase-controlled illumination.
Adb: Total absorption when two coherent beams are shining on the structure from opposite sides
Asb: Absorption with single-beam illumination
d: Thickness of the dielectric layer
k=2πn/λ, λ the wavelength in vacuum
cosϕ → interference due to the phase difference between the two beams.
https://arxiv.org/html/2510.13637v1
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