Scanning Plasmonic Color Display

TL;DR

This paper introduces a novel scanning plasmonic color display technique that uses hydrogenation-controlled switching of nanoscale pixels, enabling secure, dynamic color display and information encryption with potential applications in optical storage and anticounterfeiting.

Contribution

It presents a new method for dynamic plasmonic color generation using hydrogenation/dehydrogenation of magnesium, allowing secure, switchable nanoscale color pixels for advanced display and encryption.

Findings

Demonstrated hydrogen-controlled switching of plasmonic pixels

Created dynamic color displays with various scanning functions

Developed a hydrogen-based decoding key for secure information retrieval

Abstract

Control over plasmonic colors on the nanoscale is of great interest for high-resolution display, imaging, and information encryption applications. However, so far, very limited schemes have been attempted for dynamic plasmonic color generation. In this paper, we demonstrate a scanning plasmonic color generation scheme, in which subwavelength plasmonic pixels can be laterally switched on/off through directional hydrogenation/dehydrogenation of a magnesium screen. We show several dynamic plasmonic color displays with different scanning functions by varying the number and geometries of the palladium gates, where hydrogen enters the scanning screens. In particular, we employ the scanning effects to create a dynamic plasmonic quick response code. The information cannot be decrypted by varying the polarization states of light or by accessing the physical features. Rather, it can only be read out using hydrogen as a decoding key. Our work advances the established design concepts for plasmonic color printing and provides insights into the development of optical information storage and anticounterfeiting features.