Fabrication and tuning of plasmonic optical nanoantennas around droplet epitaxy quantum dots by cathodoluminescence

TL;DR

This paper demonstrates precise localization of droplet epitaxy quantum dots using cathodoluminescence, followed by fabrication and tuning of plasmonic nanoantennas to modify their emission, with results aligning well with simulations.

Contribution

It introduces a method combining cathodoluminescence and electron-beam lithography for precise nanoantenna fabrication around quantum dots, enabling controlled optical tuning.

Findings

Nanoantennas influence quantum dot emission based on antenna length.

Experimental results match numerical simulations.

High-precision localization improves nanoantenna integration.

Abstract

We use cathodoluminescence to locate droplet epitaxy quantum dots with a precision $\lesssim$ nm before fabricating nanoantennas in their vicinity by electron-beam lithography. Cathodoluminescence is further used to evidence the effect of the antennas as a function of their length on the light emitted by the dot. Experimental results are in good agreement with numerical simulations of the structures.