Enhanced five-photon photoluminescence in subwavelength AlGaAs resonators

TL;DR

This paper demonstrates a significant enhancement of five-photon photoluminescence in subwavelength AlGaAs resonators using Mie resonances, opening new possibilities for high-order multiphoton applications at nanoscale.

Contribution

It reports the first observation of five-photon luminescence in a subwavelength nanoantenna at room temperature, enhanced by Mie resonances, with potential for advanced nanophotonic applications.

Findings

Five-photon luminescence observed at room temperature in AlGaAs nanoantenna.

Mie resonances enhance five-photon emission efficiency by over four orders of magnitude.

Potential for applications in high-order multiphoton processes at nanoscale.

Abstract

Multiphoton processes of absorption photoluminescence have enabled a wide range of applications including three-dimensional microfabrication, data storage, and biological imaging. While the applications of two-photon and three-photon absorption and luminescence have matured considerably, higher-order photoluminescence processes remain more challenging to study due to their lower efficiency, particularly in subwavelength systems. Here we report the observation of it five-photon luminescence from a single subwavelength nanoantenna at room temperature enabled by the Mie resonances. We excite an AlGaAs resonator at around 3.6 um and observe photoluminescence at around 740 nm. We show that the interplay of the Mie multipolar modes at the subwavelength scale can enhance the efficiency of the five-photon luminescence by at least four orders of magnitude, being limited only by sensitivity of our detector. Our work paves the way towards applications of higher-order multiphoton processes at the subwavelength scales enabled by the physics of Mie resonances.