Category: Recent publications

Enhanced Delayed Fluorescence in Tetracene Crystals by Strong Light‐Matter Coupling

We have demonstrated a four-fold enhancement of the delayed fluorescence in tetracene crystals by strongly coupling singlet excitons to photons in an optical cavity formed by a nanoparticle array. The enhanced luminescence is attributed to triplet excitons that are harvested by the lower polariton band emerging from the strong coupling. These type of effects in…
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August 20, 2019 0

Spectral and temporal evidence of robust photonic bound states in the continuum on terahertz metasurfaces

In collaboration with the group of Sanchez Gil (CSIC-Spain), we have demonstrated that a simple array of gold dimers can support modes with infinite life-times. We have investigated these, so-called, Bound States in the Continuum using THz time-domain spectroscopy. Read more in our published Optica.


August 20, 2019 0

Terahertz Time-Domain Spectroscopy and Near-Field Microscopy of Transparent Silver Nanowire Networks

In collaboration with our former colleages of the Dutch Institute for Fundamental Energy Research, we have measured the sheet conductance of transparent electrodes formed by networks of Ag nanowires. The measurements have been done in a contact-free manner and spatially resolved, using our newly developed THz near-field microscope. Read more in our published Advanced Optical…
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August 20, 2019 0

Strong coupling between semiconductor nanowire modes and organic dyes

In collaboration with the groups of Jose Antonio Sanchez Gil and Francisco Garcia Vidal from Madrid (Spain), we have investigated theoretically the coupling of organic molecules and guided modes in semiconductor nanowires. The coupling strength depends on the fraction of energy spread outside the nanowire, rather than on the mode field localization. Read more here.


June 27, 2019 0

Preserving the quality of atomic layers

Our publication on how to preserve the quantum efficiency of monoatomic layers of transition metal dichalcogenides (TMDs) during transfer has been accepted for publication in Advanced Optical Materials. The effects of encapsulation on the optical properties of TMD monolayers, focusing on the impact of different processing techniques and different dielectric environments have been investigated. Read…
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May 12, 2019 0

Surface lattice resonances imaged with super-resolution microscopy

In collaboration with the group of Andrea Baldi from the Dutch Institute for Fundamental Energy Research (DIFFER), we have mapped the enhanced emission of single fluorescent molecules coupled to a plasmonic particle array using stochastic super-resolution microscopy. You can read the results here. Read also the DIFFER news item.


April 18, 2019 0

Limits to strong coupling in 2D semiconductors

Our manuscript “Limits to Strong Coupling of Excitons in Multilayer WS2 with Collective Plasmonic Resonances” has been accepted for publication in ACS-Photonics. In this manuscript, we demonstrate experimentally and describe theoretically that strong light-matter coupling in of optical modes with excitons in 2D semiconductors is limited by dielectric screening as the thickness of the semiconductor…
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February 18, 2019 0

Enhanced quality factors of surface lattice resonances in plasmonic arrays of nanoparticles published in Advanced Optical Materials

We investigate experimentally and numerically two-dimensional arrays of silver nanoparticles and show how the Q-factor of collective plasmonic resonances critically depends on the quality of the metal film, the detuning between diffraction orders and localized resonances and the absorption of adhesive layer used between the substrate and the metallic nanoparticles. These silver nanoparticle arrays can…
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January 14, 2019 0

Nonlinear Emission of Molecular Ensembles Strongly Coupled to Plasmonic Lattices with Structural Imperfections published in Physical Review Letters

We demonstrate nonlinear emission from molecular layers strongly coupled to extended light fields in arrays of plasmonic nanoparticles in the presence of structural imperfections. In contrast to recent observations of exciton-polariton lasing and condensation in organic systems, photonic modes play a minor role at the emission frequency in our system, and this emission has an…
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December 15, 2018 0

Accepted manuscript on a novel method to measure time-resolved THz photoconductivity in the near-field

In this manuscript, we show proof-of-concept measurements on a GaAs film that was excited though a total internal reflection geometry. With this technique, we can obtain the photo-excited carrier dynamics and the THz photo-conductivity with a spatial resolution well below the THz diffraction limit. The manuscript entitled “Time-resolved terahertz time-domain near-field microscopy” has been published…
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November 27, 2018 0