Adjustable three color optical filters using ferroelectric -dielectric generalized heterostructures photonic crystals

Optical spectroscopy of high dielectric contrast 3D photonic crystals

– Spectroscopy was performed along three distinct crystallographic axes of a high refractive index contrast photonic crystal and the spectra were compared with theoretical calculations. Deep dips were observed in the experimental spectra at 2.1 and 3.2μm and predicted by calculations. The photonic crystal was prepared through melt-imbibing of selenium into a self-assembled face-centered-cubic c...

Dielectric Investigations on Ferroelectric Columnar Liquid Crystals

Three-Dimensional Photonic Crystals

Principle Investigators: Georg von Freymann and Martin Wegener CFN-Financed Scientists: C. Becker (3/4 BAT IIa, 4 months), Markus Deubel (3/4 BAT IIa, 9 months), Martin Hermatschweiler (3/4 BAT IIa, 14.5 months), Nina Meinzer (3/4 BAT IIa, 1 month), Daniel Meisel (3/4 BAT IIa, 5.5 months), Michael S. Rill (3/4 BAT IIa, 32 months), Isabelle Staude (3/4 BAT IIa, 14 months) On average, this corres...

Three-dimensional metallic photonic crystals with optical bandgaps.

The fabrication of fully three-dimensional photonic crystals with a bandgap at optical wavelengths is demonstrated by way of direct femtosecond laser writing of an organic-inorganic hybrid material with metal-binding moieties, and selective silver coating using electroless plating. The crystals have 600-nm intralayer periodicity and sub-100 nm features, and they exhibit well-defined diffraction...

Near-field optical investigation of three-dimensional photonic crystals.

We show that the coupling of light from an external pointlike light source into a three-dimensional photonic crystal depends on the relative launching position with respect to the crystal lattice as well as on the frequency of light. The results are obtained with a near-field technique which is used to acquire optical information beyond the diffraction limit and to access optical details within...

A Novel Structure for Optical Channel Drop Filter using Two-Dimensional Photonic Crystals with Square Lattice

In the present paper a novel structure for optical channel drop filter (CDF) based on photonic crystal ring resonator with circular core has been proposed. In order to design the proposed CDF, the plan wave expansion (PWE) method is applied for calculation of band structure and photonic band gap while the transmission characteristics of proposed CDF have been calculated using the finite differe...