Single-Shot Multispectral Encoding: Advancing Optical Lithography for Encryption and Spectroscopy

TL;DR

This paper introduces a single-shot optical lithography technique for creating high-definition, multispectral patterns in perovskite films, enabling advanced encryption and spectroscopy without dispersive elements.

Contribution

The study presents a novel room-temperature lithography method for multispectral patterning in perovskites, enhancing optical encryption and spectroscopy capabilities.

Findings

High spectral resolution multispectral patterns achieved

Room-temperature fabrication process demonstrated

Potential applications in encryption and spectroscopy

Abstract

Most modern optical display and sensing devices utilize a limited number of spectral units within the visible range, based on human color perception. In contrast, the rapid advancement of machine-based pattern recognition and spectral analysis could facilitate the use of multispectral functional units, yet the challenge of creating complex, high-definition, and reproducible patterns with an increasing number of spectral units limits their widespread application. Here, we report a technique for optical lithography that employs a single-shot exposure to reproduce perovskite films with spatially controlled optical band gaps through light-induced compositional modulations. Luminescent patterns are designed to program correlations between spatial and spectral information, covering the entire visible spectral range. Using this platform, we demonstrate multispectral encoding patterns for encryption and multivariate optical converters for dispersive optics-free spectroscopy with high spectral resolution. The fabrication process is conducted at room temperature and can be extended to other material and device platforms.