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Updated: Jul 6, 2026

Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging
Published on: March 31, 2022
Dynamic holographic moiré patterns in photorefractive Bi12TiO20 and small-angle measurements
P A dos Santos1, L C Nunes, I Corrêa
1Instituto de Física, Universidade Federal Fluminense, Avenida Gal Milton Tavares de Souza, s/n Gragoatá, Niterói 24020-005, Rio de Janeiro, Brazil. pams@if.uff.br
Abstract:
A procedure for obtaining real-time holographic moirélike patterns and measuring small angles is proposed. Two rotated sinusoidal phase gratings are superposed, and the result represents a promising technique for making small-angle measurements in metrological applications. The experiments are performed with a diffusion-only recording mechanism in the photorefractive crystal Bi12TiO20 illuminated by lambda = 0.633 microm light from a He-Ne laser.

