Richard Taubert

3D optical Yagi-Uda nanoantenna array.

We fabricated three-dimensional arrays of optical Yagi-Uda nano-antennas. Due to the high directivity of the array structure the incoming light is received efficiently at the resonant wavelength in the near-infrared (around λ = 1.3 µm).

Palladium-based plasmonic perfect absorber in the visible wavelength range and its application to hydrogen sensing.

We report on the experimental realization of a palladium-based plasmonic perfect absorber at visible wavelengths and its application to hydrogen sensing. Our design exhibits a reflectance <0.5% and zero transmittance at 650 nm and the operation wavelength of the absorber can be tuned by varying its structural parameters. Exposure to hydrogen gas causes a rapid and reversible increase in reflectance on a time scale of seconds. This pronounced response introduces a novel optical hydrogen detection scheme with very high values of the relative intensity response.

Classical analog of electromagnetically induced absorption in plasmonics

We present the classical analog of electromagnetically induced absorption which is achieved by tuning the coupling phase between a bright and a dark plasmonic resonance in the intermediate regime and thus obtaining constructive interference.

From Near-Field to Far-Field Coupling in the Third Dimension: Retarded Interaction of Particle Plasmons

We study the transition from the near-field to the far-field coupling regime of particle plasmons in a three-dimensional geometry. In the far-field regime, retardation plays the dominant role and the plasmonic resonances are radiatively coupled. When the spatial arrangement of the oscillators is matched to their resonance wavelength, superradiant-like effects are observed.

Plasmonic analog of electromagnetically induced absorption: simulations, experiments, and coupled oscillator analysis

We present a comprehensive analysis of the plasmonic analog of electromagnetically induced absorption. Interaction of plasmonic dipoles with plasmonic quadrupoles in the special case for nonvanishing retardation introduces an additional phase factor in the coupling constant, which can result in constructive interference of the two resonances. This leads to narrow resonances in the complex plasmonic absorption spectrum. We present simulations for a broad parameter space, matching experiments, as well as an extensive model analysis. Our paper comprises a situation that represents an intermediate plasmonic coupling regime, between near-field and far-field coupling.

Octave-wide photonic band gap in three-dimensional plasmonic Bragg structures and limitations of radiative coupling

We demonstrate that a three-dimensional arrangement of particle plasmonic oscillators at Bragg distance leads to a superradiant plasmon mode. We observe the formation of a very broad photonic band gap that spans almost one octave.

3D optical Yagi-Uda nanoantenna array

We fabricated three-dimensional arrays of optical Yagi-Uda nano-antennas. Due to the high directivity of the array structure the incoming light is received efficiently at the resonant wavelength in the near-infrared (around λ = 1.3 µm).

From near-field to far-field: Radiative coupling of particle plasmon resonances in three-dimensional geometries

Coupling between individual particle plasmon resonances (PPRs) has been investigated quite thoroughly during the past years. Most of the work was dedicated to near-field coupling with a close spacing of the resonant particles. In this limit, retardation is negligible, but also the interesting properties of the radiating PPRs are neglected mostly. In contrast, when placing particles at distances of the order of their emission wavelength, coupling can be mediated by the radiation fields of the PPRs.

Octave-wide photonic band gap in three-dimensional plasmonic Bragg structures

We demonstrate that a three-dimensional arrangement of particle plasmonic oscillators at Bragg distance leads to a superradiant plasmon mode. We observe the formation of a very broad photonic band gap that spans almost one octave.

Resonant mode coupling for deriving optical resonances in stacked grating structures

We present a method to approximate the optical resonances of stacked dielectric and metallic gratings using the Fourier modal method and optical scattering matrix theory. The resulting equations form a low‐dimensional linear eigenvalue problem that can easily be solved for varying inter‐grating distances, including near field effects as well as multiple scattering in the far field regime.