Enhancement of Photoluminescence of Colloidal Quantum Dots in Plasmonic Metasurfaces Supporting Bound State in the Continuum

Quantum dot synthesis is an increasingly popular technology for the development of optoelectronic devices [1]. Specifically, colloidal quantum dots have shown promise in the infrared range, offering opportunities for the advancement of telecommunications and the creation of infrared light-emitting diodes [2]. One possible approach to enhance the interaction between light and matter is through the use of nanostructures, such as plasmon resonances [3]. However, plasmon resonances often suffer from low quality factors due to internal losses. To overcome this limitation, researchers have explored the use of periodic plasmonic systems, which can significantly increase the quality factors of existing modes [3]. Additionally, metasurfaces, which possess bound states in the continuum (BIC), offer the advantage of infinite radiative quality factors [4]. In this context, a recent study focused on the efficient tuning of a plasmonic metasurface that supports bound states in the continuum. This tuning approach aims to enhance the photoluminescence of HgTe colloidal quantum dots in the infrared region. By leveraging the technological simplicity of this plasmonic metasurface, the researchers were able to achieve improved performance in terms of photoluminescence. Overall, this work demonstrates the potential of plasmonic metasurfaces and bound states in the continuum for enhancing the interaction between light and matter in quantum dot systems. This research opens up new avenues for the development of advanced infrared optoelectronic devices with improved performance and scalability.