Category: Recent publications

Effective Negative Diffusion of Singlet Excitons in Organic Semiconductors

We have studied the diffusion of singlet and triplet excitons in tetracene crystals, a prototype singlet fission material, using ultrafast microscopy techniques. Upon laser excitation, triplets diffuse steadily while the singlet exciton distribution narrows, corresponding to an effective negative singlet diffusion. This counterintuitive result is explained by nonlinear triplet‒triplet annihilation. View the article in the Journal…
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February 15, 2021 0

Strong light-matter coupling with Si nanoparticles

In our recently published manuscript, we demonstrate the strong coupling of electric and magnetic resonances in arrays of silicon nanoparticles with excitons in organic layers. This manuscript published in ACS Photonics has been selected by the journal as one of the most relevant results published over the past 12 months and highlighted during the celebration…
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August 24, 2020 0

Light Conversion Efficiency of Emitters on Top of Plasmonic and Dielectric Arrays of Nanoparticles

Together with our collaborators from Kyoto University, we are proud to contribute to the special issue in ECS Journal of Solid State Science and Technology in the honor of Prof. Isamu Akasaki. In this manuscript we investigate the optical absorption of emitter layers deposited on diffractive arrays of silver and titanium dioxide nanoparticle using an…
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June 23, 2020 0

Ultrafast Dynamics of Non-equilibrium Organic Exciton-Polariton Condensates

In our recently published manuscript in Nano Letters, we have demonstrated the important role that vibrations in molecules have for the condensation and the emission of organic exciton-polariton lasers. You can find the manuscript in this link or read the news item.

December 28, 2019 0

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