Cryptographic Strain-Dependent Light Pattern Generators

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, 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 demonstrated through exemplary light patterns, including micro-QR-codes, that are correctly projected and recognized upon strain gating while remaining cryptic for as-produced devices. The light pattern of micro-QR-codes can also be projected by two coupled magic windows, with one of them acting as the decryption key. Such novel, freeform elements with 3D shape and tailored functionalities is relevant for applications in illumination design, smart labels, anti-counterfeiting systems, and cryptographic communication.

Automated summary

The article introduces 3D-printed and stretchable magic windows that generate light patterns through refraction and can change shape and light texture through controlled strain. It demonstrates cryptographic magic windows with exemplary light patterns and shows how micro-QR-codes are correctly projected and recognized upon strain gating while remaining cryptic for as-produced devices. The novel, freeform elements with 3D shape and tailored functionalities are relevant for various applications such as illumination design, smart labels, anti-counterfeiting systems, and cryptographic communication.