Alexandra Ledermann

Rhombicuboctahedral Three-Dimensional Photonic Quasicrystals

[*] A. Ledermann, Prof. M. Wegener, Dr. G. von Freymann Institut für Nanotechnologie, Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen (Germany) E-mail: Alexandra.Ledermann@kit.edu Prof. M. Wegener, Dr. G. von Freymann Institut für Angewandte Physik and DFG-Center for Functional Nanostructures (CFN) Karlsruhe Institute of Technology (KIT) Wolfgang-Gaede-Straße 1, D-76131 Karlsruhe (Germany)

Multiple scattering of light in three-dimensional photonic quasicrystals

Three-dimensional icosahedral dielectric photonic quasicrystals previously revealed highly structured transmittance spectra and unusual photon transport properties. Using a periodic approximant approach, we show that all these findings are consistent with multiple scattering of light.

Er doped As 2 S 3 photoresist for 3-D direct laser fabrication of 3-D nanostructures

We present a novel high-index-of-refraction (2.45) photoresist material based on erbium doped arsenic trisulfide. It shows room temperature photoluminescence at 1.5 microns wavelength, and can directly be used for direct laser writing.

Three-dimensional rhombicuboctahedral photonic quasicrystals

Studies on three-dimensional quasicrystals have been restricted to the icosahedral class so far. We rationally construct the blueprint of a novel, namely the rhombicuboctahedral class. Corresponding polymer microstructures are characterized by visible-light Laue diffraction experiments.

Optical transport properties of three-dimensional photonic quasicrystals

We theoretically describe the optical properties of three-dimensional icosahedral photonic quasicrystals by means of a periodic approximant approach. Experimental findings that were previously ascribed to extrinsic effects are found to be intrinsic properties of quasicrystals.

Fabrication of Silicon Inverse Woodpile Photonic Crystals

We fabricate silicon inverse woodpile structures for the first time. Direct laser writing of polymeric templates and a novel silicon-single-inversion procedure lead to structures with gap/midgap ratios of 14.2 % centered at 2.5 mum wavelength.

Three‐dimensional Photonic Quasicrystals: Fabrication and Characterization

Quasicrystals are neither crystalline nor amorphous solids. They are aesthetically highly appealing and posses intriguing physical properties. Recently, three‐dimensional photonic quasicrystals have become available for the near‐infrared spectral region through nanofabrication. This opens the way for photonic transport measurements to understand the influence of symmetry onto transport properties. In this article we describe the fabrication via direct laser writing and silicon single inversion and the optical characterization via Laue‐diffraction experiments.

Fabrication of three-dimensional photonic quasicrystals for the near-infrared spectral region

We report on the fabrication of three-dimensional icosahedral photonic quasicrystals for optical frequencies via direct laser writing. Optical diffraction patterns measured along the 5-fold axis reveal the expected 10-fold symmetry.