Tunable Plasmonic Nanoantennas in Rolled-up Microtubes Coupled to Integrated Quantum Wells

TL;DR

This paper introduces a tunable plasmonic nanoantenna integrated into a rolled-up microtube, enabling control over quantum well emission properties through electromagnetic coupling, demonstrated by experimental measurements and simulations.

Contribution

It presents a novel design of a tunable plasmonic nanoantenna integrated with semiconductor microtubes, combining experimental and simulation analysis of its coupling with quantum wells.

Findings

Redshift in quantum well emission observed

Reduction in emission lifetime detected

Coupling attributed to high-order plasmonic modes

Abstract

We propose and realize a tunable plasmonic nanoantenna design consisting of two stacked Ag cuboids that are integrated into a rolled-up semiconductor microtube. The antenna's resonance is tuned by varying the cuboid's distance to match the photoluminescence emission of an embedded GaAs quantum well. Spatially, spectrally and temporally resolved photoluminescence measurements reveal a redshift and a reduction in lifetime of the quantum-well emission as signatures for the coupling to the antenna system. By means of finite-element electromagnetic simulations, we assign the coupling to an excitation of a high-order plasmonic mode inside the Ag cuboids.