Gunnar Dolling
Karlsruhe Institute of Technology
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Publication
Featured researches published by Gunnar Dolling.
Optics Letters | 2007
Gunnar Dolling; Martin Wegener; Costas M. Soukoulis; Stefan Linden
We further miniaturize a recently established silver-based negative-index metamaterial design. By comparing transmittance, reflectance, and phase-sensitive time-of-flight experiments with theory, we infer a real part of the refractive index of -0.6 at a 780 nm wavelength--which is visible in the laboratory.
Optics Letters | 2006
Gunnar Dolling; Christian Enkrich; Martin Wegener; Costas M. Soukoulis; Stefan Linden
We fabricate and characterize a low-loss silver-based negative-index metamaterial based on the design of a recent theoretical proposal. Comparing the measured transmittance and reflectance spectra with theory reveals good agreement. We retrieve a real part of the refractive index of Re(n)= -2 around 1.5 microm wavelength. The maximum of the ratio of the real to the imaginary part of the refractive index is about three at a spectral position where Re(n)= -1. To the best of our knowledge, this is the best figure of merit reported for any negative-index photonic metamaterial to date.
Optics Letters | 2005
Gunnar Dolling; Christian Enkrich; Martin Wegener; Jiangfeng Zhou; Costas M. Soukoulis; Stefan Linden
We study the optical properties of metamaterials made from cut-wire pairs or plate pairs. We obtain a more pronounced optical response for arrays of plate pairs, a geometry that also eliminates the undesirable polarization anisotropy of the cut-wire pairs. The measured optical spectra agree with simulations, revealing negative magnetic permeability in the range of telecommunications wavelengths. Thus nanoscopic plate pairs might serve as an alternative to the established split-ring resonator design.
Optics Letters | 2007
Gunnar Dolling; Martin Wegener; Stefan Linden
We modify a recently theoretically suggested multilayer negative-index photonic metamaterial design and fabricate corresponding structures with up to three functional layers (seven actual layers) for the first time to our knowledge. Measured transmittance and reflectance spectra agree well with theory.
Applied Physics Letters | 2006
Gunnar Dolling; Martin Wegener; Achim Schädle; Sven Burger; Stefan Linden
By measuring and calculating oblique-incidence transmittance spectra of a negative-index photonic metamaterial layer, the authors infer the in-plane dispersion relation of the magnetization wave. From the geometry and the dispersion shape, the authors conclude that coupling is predominantly via magnetic dipoles for wave propagation along the magnetic-dipole direction. These magnetization waves are the classical analog of magnon excitations of quantum-mechanical spins.
Optics Express | 2007
Gunnar Dolling; Martin Wegener; Costas M. Soukoulis; Stefan Linden
The literature regarding the influence of the hole shape on the performance, especially on the losses, of negative-index metamaterials on the basis of the so-called double-fishnet structure is unclear. We investigate this aspect in a systematic theoretical study showing that the figure of merit can differ by as much as a factor of 2.5 between rectangular and circular holes, respectively.
Optics Express | 2006
Gunnar Dolling; Martin Wegener; Stefan Linden; Christoph Hormann
Using a ray-tracing approach, we calculate photorealistic images and simple movies of objects in a material with negative index of refraction. Our results show several surprising and drastic effects, for example reversal of apparent object velocity, extreme distortions of object shape, and even apparent loss of connectivity of simple objects. The material presented aims at giving both researchers and laymen an intuition and visual understanding for the unusual optical properties of negative-index materials.
lasers and electro optics society meeting | 2007
Nils Feth; Manuel Decker; Gunnar Dolling; Matthias W. Klein; Stefan Linden; Martin Wegener
This article presents a short discussion on the fabrication of photonic metamaterials. The method of choice for fabricating metamaterials is still electron beam lithography despite its intrinsic drawbacks like long writing time and high operation costs. Thus only small areas can be structured within reasonable time and at reasonable costs. Another way to fabricate high-quality photonic metamaterials on a macroscopic scale is provided by interference lithography which allows structuring huge areas. Another promising technique to achieve large-scale, high-quality metamaterials is nanoimprint lithography, which was recently applied to fabricate photonic metamaterials.
quantum electronics and laser science conference | 2006
Gunnar Dolling; Christian Enkrich; Martin Wegener; Costas M. Soukoulis; Stefan Linden
We present metamaterials consisting of a combination of cut-wire pairs as ldquomagnetic atomsrdquo and a diluted metal. Our experiments reveal a negative refractive index at 1.4 mum wavelength, with a transmittance exceeding 50%.
quantum electronics and laser science conference | 2007
Stefan Linden; Gunnar Dolling; Martin Wegener; Costas M. Soukoulis
We report on the fabrication and characterization of negative-index photonic metamaterials with up to three functional layers. The effective material properties of the photonic metamaterials do not change significantly with the number of functional layers.