Cryptographic Strain-Dependent Light Pattern Generators. (arXiv:2204.07550v1 [physics.optics])

Refractive freeform components are becoming increasingly relevant for
generating controlled patterns of light, because of their capability to
spatially-modulate optical signals with high efficiency and low background.
However, the use of these devices is still limited by difficulties in
manufacturing macroscopic elements with complex, 3-dimensional (3D) surface
reliefs. Here, 3D-printed and stretchable magic windows generating light
patterns by refraction are introduced. The shape and, consequently, the light
texture achieved can be changed through controlled device strain. Cryptographic
magic windows are …

optics physics