University of Toronto

Forschungszentrum Karlsruhe Gmbh

Other

Karlsruher Institut Fur Technologie

Opalux Incorporated

Universität Karlsruhe

Georg Von Freymann

Geoffrey Alan Ozin

Martin Wegener

Andre Arsenault

Martin Hermatschweiler

Vladimir Kitaev

Scott Andrew Mabury

Alexandra Ledermann

Sean Wong

Ulrich Kamp

Martin Hermatschweller

A compressible photonic crystal comprising a polymer with an ordered array of voids, the photonic crystal having a reflectance in a first wavelength range for light incident to its incident surface and its opposing incident surface; wherein compression against at least a portion of at least one of the surfaces shifts the reflectance to a second wavelength range in at least that portion of that surface. The crystal may be used in authentication devices of various types.

Compressible photonic crystal

An optical arrangement has a laser configured to emit a laser beam, an amplitude mask and a focusing element. The amplitude mask is disposed between the laser and the focusing element in a path of the laser beam such that the laser beam hits the amplitude mask before being modified by the focusing element so as to direct the laser beam to a focal point within a photosensitive material.

Optical arrangement and its use

The invention relates to a process for producing a photonic crystal which consists of a material of high refractive index, comprising the following process steps:

Method for producing a photonic crystal

A method of using a chemical compound as an etchant for the removal of unmodified areas of a chalcogenide-based glass, while leaving the imagewise modified areas un-removed, wherein the compound contains a secondary amine, R1 R2 NH, with R1 and/or R2 having a sterically bulky group with more than 5 atoms.

Chemical etching composition for the preparation of 3-D nano-structures

The present invention provides a straightforward and robust synthetic process for producing a chromatographic column with eluent-sensitive light diffracting properties based on an inherent photonic band structure and a chromatographic device using the chromatographic column. The present invention provides chromatographic devices employing a chromatographic column which in one embodiment is a photonic colloidal crystal which includes an assembly of colloidal microspheres assembled into a highly ordered array within a housing such as a tube with the highly ordered array being a photonic crystal along the length of the crystal, and a second embodiment which is an inverse construct of the first embodiment, where solid microspheres making up the photonic colloidal crystal chromatographic column are replaced with spherical voids or void spaces subsequent to infiltration of a material of selected refractive index. The photonic band structures of the first type of column made with colloidal particles and the second type of column made by inverting the first type of column may include a photonic band gap, a fundamental stop-band, higher stop-bands, or combinations thereof.

Photonic colloidal crystal columns and their inverse structures for chromatography

Growing community of inventors

Karlsruhe, Germany

Georg Von Freymann