Coherent absorption and enhanced photoluminescence in thin layers of nanorods

TL;DR

This paper demonstrates that thin layers of quantum rod nanostructures can achieve high light absorption through coherent interference, significantly boosting their photoluminescence emission.

Contribution

It introduces a method to enhance photoluminescence in quantum rod layers via coherent absorption, with experimental validation of substantial emission enhancement.

Findings

Achieved 80% light absorption in 23 nm QR layers.

Observed up to sevenfold photoluminescence enhancement.

Demonstrated polarization-dependent absorption and emission enhancement.

Abstract

We demonstrate a large light absorptance (80%) in a nanometric layer of quantum dots in rods (QRs) with a thickness of 23 nm. This behavior is explained in terms of the coherent absorption by interference of the light incident at a certain angle onto the very thin QR layer. We exploit this coherent light absorption to enhance the photoluminescent emission from the QRs. Up to a seven- and fivefold enhancement of the photoluminescence is observed for p- and s-polarized incident light, respectively.