
1.Institute of Automation and Control Processes, Far Eastern Branch, Russian Academy of Sciences, Vladivostok 690041, Russia
2.Far Eastern Federal University, Vladivostok 690090, Russia
3.University of Technology Sydney, NSW 2007 Sydney, Australia
4.Department of Materials Science and Engineering, and Centre for Functional Photonics (CFP), City University of Hong Kong, Kowloon, Hong Kong SAR, China
5.Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China
6.Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
7.Swinburne University of Technology, John St., Hawthorn, VIC 3122, Australia
8.Melbourne Centre for Nanofabrication, ANFF, 151 Wellington Road, Clayton, VIC 3168, Australia
A A. Kuchmizhak (alex.iacp.dvo@mail.ru)
A L. Rogach (andrey.rogach@cityu.edu.hk)
Published:2020,
Published Online:04 February 2020,
Received:02 August 2019,
Revised:28 December 2019,
Accepted:09 January 2020
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Sergeev, A. A. et al. Tailoring spontaneous infrared emission of HgTe quantum dots with laser-printed plasmonic arrays. Light: Science & Applications, 9, 131–140 (2020).
Sergeev, A. A. et al. Tailoring spontaneous infrared emission of HgTe quantum dots with laser-printed plasmonic arrays. Light: Science & Applications, 9, 131–140 (2020). DOI: 10.1038/s41377-020-0247-6.
Chemically synthesized near-infrared to mid-infrared (IR) colloidal quantum dots (QDs) offer a promising platform for the realization of devices including emitters
detectors
security
and sensor systems. However
at longer wavelengths
the quantum yield of such QDs decreases as the radiative emission rate drops following Fermi's golden rule
while non-radiative recombination channels compete with light emission. Control over the radiative and non-radiative channels of the IR-emitting QDs is crucially important to improve the performance of IR-range devices. Here
we demonstrate strong enhancement of the spontaneous emission rate of near- to mid-IR HgTe QDs coupled to periodically arranged plasmonic nanoantennas
in the form of nanobumps
produced on the surface of glass-supported Au films via ablation-free direct femtosecond laser printing. The enhancement is achieved by simultaneous radiative coupling of the emission that spectrally matches the first-order lattice resonance of the arrays
as well as more efficient photoluminescence excitation provided by coupling of the pump radiation to the local surface plasmon resonances of the isolated nanoantennas. Moreover
coupling of the HgTe QDs to the lattice plasmons reduces the influence of non-radiative decay losses mediated by the formation of polarons formed between QD surface-trapped carriers and the IR absorption bands of dodecanethiol used as a ligand on the QDs
allowing us to improve the shape of the emission spectrum through a reduction in the spectral dip related to this ligand coupling. Considering the ease of the chemical synthesis and processing of the HgTe QDs combined with the scalability of the direct laser fabrication of nanoantennas with tailored plasmonic responses
our results provide an important step towards the design of IR-range devices for various applications.
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