2D silver-nanoplatelets metasurface for bright directional photoluminescence, designed with the local Kirchhoff's law

TL;DR

This paper presents a novel 300 nm thick metasurface device combining plasmonic structures and nanoplatelets, designed using a local Kirchhoff's law approach, achieving high directionality and brightness in photoluminescence.

Contribution

It introduces a new design methodology for metasurfaces based on local Kirchhoff's law, enabling ultrathin, efficient, and directional light-emitting devices.

Findings

Record high directionality of emitted light

Enhanced brightness of the photoluminescent device

Successful integration of nanoplatelets with plasmonic metasurface

Abstract

Semiconductor colloidal nanocrystals are excellent light emitters in terms of efficiency and spectral control. Integrating them with a metasurface would pave the way to ultrathin photoluminescent devices with reduced amount of active material and performing complex functionalities such as beam shaping or polarization control. To design such a metasurface, a quantitative model of the emitted power is needed. Here, we report the design, fabrication and characterization of a $\approx$ 300 nm thick light-emitting device combining a plasmonic metasurface with an ensemble of nanoplatelets. The source has been designed with a new methodology based on a local form of Kirchhoff's law. The source displays record high directionality and brightness.