Toon Coenen

TL;DR: In this article, a metal-dielectric nanostructure with an effective refractive index $n=0$ in the visible spectral range was constructed and a vanishing phase advance was observed at the cutoff frequency.

TL;DR: A novel experimental technique that uses a high-energy electron beam as broad band point dipole source of visible radiation, to study the emission properties of a Yagi-Uda antenna composed of a linear array of Au nanoparticles, and establishes angle-resolved cathodoluminescence spectroscopy as a powerful technique tool to characterize single optical nanoantennas.

TL;DR: It is shown that strongly directional emission can also be obtained from a simple individual gold nanodisk, utilizing the far-field interference of resonant electric and magnetic modes, using angle-resolved cathodoluminescence spectroscopy.

TL;DR: A first look inside photonic crystal cavities revealing subwavelength details of the resonant modes is presented, providing direct guidelines for the optimum location of emitters to control their emission and key fundamental insights into light-matter coupling at the nanoscale.

TL;DR: Hyperspectral cathodoluminescence microscopy is employed to characterize the response of single Ga NPs of various sizes within an irregular ensemble by spatially and spectrally resolving both in-plane and out-of-plane plasmonic modes.