SCOPE

Strongly Coupled Optoelectronics (SCOPE)-Vici grant 2017-2022

The performance of optoelectronic devices (devices that emit light from an electrical current or produce a current from light) is determined by material properties such as the diffusion of bound electrical charge excitations, i.e., the so-called excitons. In materials with a high degree of structural disorder, which are typically easy to process and, consequently, interesting for applications such as solar cells and detectors, this diffusion is reduced by the disorder and the efficiency of devices is severely limited.

In this project, researchers will investigate the coupling of light to materials developed for optoelectronic applications. These material are organic blendes used in organic solar cells and novel two-dimensional semiconductors developed for ultrathin devices. In particular, a regime of this coupling, known as strong light-matter coupling, will be investigated. Strong light-matter coupling corresponds to the situation in which light hybridizes with excitons in the material to form the so-called exciton-polaritons. Exciton-polaritons are half-light and half-matter particles that are expected to diffuse over much longer distances than excitons in normal materials due to their hybrid character.

In order to achieve strong coupling it is necessary to confine light in an optical cavity, which is typically formed by a pair of very good mirrors, and place the material inside. This configuration limits the use of strong coupling in optoelectronic devices, such as solar cells or photodetectors, in which the material needs to be exposed as good as possible to light. Therefore, researchers will use open cavities recently discovered, which are easy to access by light from the outside. These cavities are formed by periodic arrays of metallic nanoparticles with very precise structure and dimensions to achieve strong coupling to materials deposited on top. Researchers will also investigate the condensation of exciton-polaritons in open cavities formed by arrays of nanoparticles. This condensation corresponds to the accumulation of the exciton-polaritons in the same state, i.e. the ground state. By controlling the dimension of the nanoparticles and the structure of the array, researchers will achieve control of the flow of exciton-polaritons, opening a myriad of possibilities for fundamental research and applications.

People

  • Matthijs Berghuis
  • Stan ter Huurne
  • Mohammad Ramezani
  • Jaime Gómez Rivas

Publications

Reports

  • Bachelor thesis Modeling of Exciton Transport in 2D Semiconductors by Daan Swinkels (2018).
  • Internship report Exciton Dynamics in Atomically-Thin Transition Metal Dichalcogenides by of Simone Eizagirre (2018).
  • Internship report Fabrication of atomically thin two dimensional semiconductors by Lisette Spiering (2018).

Patents

  • 2018: Method and system for performing terahertz near-field measurements.

Conference contributions

Contributed talks
  • IRRMW-THz 2018, Nagoya (Japan) Diffraction Enhanced Transparency in a Hybrid Gold-Graphene THz Metasurface by Stan ter Huurne et al.
  • IRRMW-THz 2018, Nagoya (Japan) THz Transient Photoconductivity With Near-Field Detection by Niels van Hoof et al.
  • NFO15, Troyes (France) Screened Strong Coupling of Excitons in Multilayer WS2 with Collective Plasmonic Resonances by Shaojun Wang et al. (2018-08-30).
  • NFO15, Troyes (France) Diffraction Enhanced Transparency in a Hybrid Gold-Graphene THz Metasurface by Stan ter Huurne at al. (2018-08-28).
  • PLMCN19, Chengdu(China) Fluorescence Lifetime Imaging of Exciton Dynamics and Transport in WS2 Monolayers by Shaojun Wang et al. (2018-05-15).
  • TNT2018, Lecce (Italy) Interaction and coherence of a plasmon-exciton polariton condensate by Milena De Giorgi at al.
Invited talks
  • Invited lecture at PhD school (Kyoto Universtiy, Japan), Extended open cavities for polaritonic devices, by Jaime Gómz Rivas (2018-11-12).
  • Invited seminar at CDT Metamaterials (Exeter, UK), Surface Lattice Resonances in Arrays of Metallic Particles: From Enhanced Emission to Induced Transparency, by Jaime Gómez Rivas (2018-10-12).
  • Invited talk at ICSPC9 (Montreal (Canada), Plasmon-Exciton-Polariton Lasing, by Mohammad Ramezani (2018-07-15).
  • Intived talk at Ad70 Symposium (Enschede, The Netherlands), Extended open cavities for polaritonic devices, by Jaime Gómez Rivas (2018-06-27).
  • Invited talk at Summer School, “Prospects of Plasmonics for Quantum Technologies” (Göteborg, Sweden), Extended open cavities for polaritonic devices, by Jaime Gomez Rivas (2018-06-25).
  • Invited talk at QED-M2 “New Landscapes for Molecules and Materials”, Collège de France (Paris, France), Strong light-matter coupling in extended open cavities, by Jaime Gomez Rivas (2018-06-18).
Posters in International conferences
  • Poster at chiral modes in optics and electronics of 2D systems, Aussoirs (France), Screened Strong Coupling of Excitons in Multilayer WS2 with Collective Plasmonic Resonances, by Shaojun Wang (2018-11-26).
  • Poster at XXV INC Summer School, Madrid (Spain), Excitation enhancement and directional emission of 2D semiconductors coupled to nanoatenna arrays, by Gabriel Castellanos (2018-09-15).
  • Poster at NFO15, Troyes (France) Near-field mapping of THz transient photoconductivity, by Niels van Hoof (2018-08-28).
  • 2017-01-08 Poster at N2d 2017, San Sebastián(Spain), Strong Coupling of Monolayer TMDs with Metallic Photonic Nanostructures at Room Temperature, by Shaojun Wang (2018-08-28).
Contributions in national conferences
  • Poster at Physics@Veldhoven (Veldhoven 2018). Room temperature strong coupling of 2D semiconductors with plasmonic nanoantenna arrays, by Shaojun Wang  (2018-01-23).
  • Poster at Physics@Veldhoven (Veldhoven 2018). Plasmon-exciton polariton condensation set by quasi-long range order and nonlinearities, by Mohammad Ramezani (2018-01-23).
  • Poster at Physics@Veldhoven (Veldhoven 2018). THz near-field time-domain spectroscopy of resonant structures and materials, by Niels van Hoof (2018-01-23).

Outreach