Bi-metallic array of plasmonic nanoparticles for LED enhancement

27 Mar 2024
Job Information

Organisation/Company

Université de Technologie de Troyes

Research Field

Physics

Researcher Profile

Recognised Researcher (R2)
Leading Researcher (R4)
First Stage Researcher (R1)
Established Researcher (R3)

Country

France

Application Deadline

30 May 2024 - 22:00 (UTC)

Type of Contract

Temporary

Job Status

Full-time

Offer Starting Date

1 Oct 2024

Is the job funded through the EU Research Framework Programme?

Not funded by an EU programme

Is the Job related to staff position within a Research Infrastructure?

No

Offer Description

Metallic nanoparticles can support resonances when the metal's electrons oscillate in phase with an exciting electromagnetic wave. These Localized Surface Plasmon Resonances (LSPR) are currently studied in many different research fields to improve a number of physical phenomena,  like the photon-to-electron conversion efficiency in solar panels as well as the electron-to-photon conversion efficiency in light-emitting diodes (LEDs). By correctly choosing the metallic material of the nanoparticles, one can tune the spectral range in which they can have an exalting effect. Indeed, gold nanoparticles present resonances in the red part of the visible spectral range where aluminum nanoparticles present resonances in the blue one.
Unfortunately, LSPR present very poor-quality factors compared to other resonant phenomena, mainly because they are largely damped within the metallic material. However, when the metallic nanoparticles are organized as arrays, one can observe a diffraction phenomenon which makes it possible to couple all the nanoparticles together and to reduce the damping of their LSPR. This collective resonance, called Surface Lattice Resonance (SLR), takes place when the LSPR is coupled to an in-plane (grazing) diffraction order.
The objective of this project is to design an array composed of nanoparticles of two different materials (gold and aluminum in a first place) in order to excite SLR modes and to spectrally tune them in the absorption and emission bands of emitting molecules or quantum dots within a LED device.
The following methodology will be used:
- Numerical simulation of the bimetallic network allowing the optimization of the geometry (diameters of the different particles, pitch of the network, shape of the mesh, etc.) in order to obtain good quality SLR modes at the required spectral positions (in progress via the use of Lumerical software (FDTD))
- Manufacturing by double electronic lithography of the bi-metallic network (technique mastered by Anne-Laure Baudrion)
- Optical characterization of SLR modes via extinction micro-spectroscopy (microscope already operational at L2n and  possibility of doing all these characterizations at ITODYS with the thesis co-director).
- Characterization by fluorescence microscopy of the emitters deposited on the surface of the bi-metallic network (FLIM microscope already at L2n and operational)

Funding category: Contrat doctoral
UTT Salary
PHD title: Doctorat en Sciences pour l'Ingénieur, spécialité Matériaux, Mécanique, Optique et Nanotechnologie
PHD Country: France

Requirements
Specific Requirements

The candidate must hold a Master's degree with a physics focus, in a field related to Electromagnetism and/or Photonics. An aptitude for experimental work, if possible in a clean room, is necessary for the success of this project. Skills in numerical simulation will also be appreciated.

Additional Information
Work Location(s)

Number of offers available

1

Company/Institute

Université de Technologie de Troyes

Country

France

City

Troyes

Geofield

Where to apply

Website

https://www.abg.asso.fr/fr/candidatOffres/show/id_offre/121831

Contact

Website

http://www.utt.fr

STATUS: EXPIRED