Selective Directional Enhancement in Gold/Perovskite Quantum Dot Metasurfaces

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

Abstract

Controlling directional radiation with minimal loss and fabrication effort through scalable methods is essential for integrating metasurfaces into photonic devices. Existing strategies enable tuning radiation properties by altering optical parameters of subwavelength dielectric gratings. Herein, a simple method is demonstrated to control the radiation direction of perovskite quantum dot (QD) metasurfaces through the addition of thin gold layers. This approach utilizes hybrid plasmonic modes and defect-free, template-assisted self-assembly techniques for low-loss, large-area production. This colloidal method allows precise control over nanostructure formation, ensuring reproducibility and enhanced optical properties. A 4.6-fold enhancement of the radiation toward the substrate and a 4.4-fold enhancement toward the cover region is achieved by evaporating a thin gold film with an optimal periodicity of 500 nm. Notably, the insertion of a metal layer allows the cover mode to exhibit enhancements that exceed typical expectations for plasmonic metasurfaces. This design is supported by plasmonic lattice theory and validated by electromagnetic modeling, allowing the gamma point to be customized to enhance emission in specific directions and media directly. This rational design strategy enhances the functionality of plasmonic perovskite-based metasurfaces for photonic on-chip applications, including nonlinear light-emitting devices and directional light sources.

Details

Original languageEnglish
Article number2403397
JournalAdvanced optical materials
Volume13
Issue number13
Publication statusPublished - 5 May 2025
Peer-reviewedYes

Keywords

Keywords

  • directional emission, metasurfaces, Perovskite quantum dots, photoluminescence, surface plasmon polaritons