Disordered plasmonic nanocavity enhanced quantum dot emission

Date

2023-08-31

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Source Title

Journal of Physics D: Applied Physics

Print ISSN

0022-3727

Electronic ISSN

1361-6463

Publisher

Institute of Physics

Volume

56

Issue

47

Pages

475107-1 - 475107-7

Language

en_US

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Abstract

In this paper, a large-scale compatible plasmonic nanocavity design platform is utilized to achieve a nearly order of magnitude photoluminescence (PL) enhancement. The proposed design is made of multi-sized/multi-spacing gold (Au) nanounits that are uniformly wrapped with a thin aluminum oxide (Al2O3) layer, as a foreign host to form a metal-insulator-semiconductor cavity, as they are coated with semiconductor quantum dots (QDs). Our numerical and experimental data demonstrate that, in an optimal insulator layer thickness, the simultaneous formation of broadband Fabry-Perot resonances and plasmonic hot spots leads to enhanced light absorption within the QD unit. This improvement in absorption response leads to the PL enhancement of QDs. This work demonstrates the potential and effectiveness of a random plasmonic nanocavities host in the realization of lithography-free efficient emitters. © 2023 IOP Publishing Ltd

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Published Version (Please cite this version)