Concept

Couleur structurelle

Publications associées (65)

Optical transmission properties of corrugated nanoscale hole arrays in thin gold films

Jürgen Brugger, Harry Heinzelmann, Mona Julia Katharina Klein, Raphaël Pugin

We present the characterization of short-range ordered hexagonal arrays of subwavelength holes in thin gold films. The hole arrays are fabricated by a low-cost technique using convectively self-assembled polystyrene beads as an initial pattern template. Ou ...

2010

Ultrafast manipulation of hard x-rays by efficient Bragg switches

Michael Herzog, Renske Marjan van der Veen

We experimentally demonstrate efficient switching of the hard x-ray Bragg reflectivity of a SrRuO3 /SrTiO3 superlattice by optical excitation of large-amplitude coherent acoustic superlattice phonons. The rocking curve changes drastically on a 1 ps timesca ...

American Institute of Physics2010

Opportunities in microstructured photonics

Hans Peter Herzig, Toralf Scharf, Tristan Sfez

The progress in novel light sources, detectors, materials and technology enable new opportunities and challenges for diffractive optics and nanoscale photonics. Important are also analysis tools, such as near-field imaging (SNOM). Only structures that can ...

EOS2010

Ph.D. Research Proposal: Biomimetic Characteristics of an Active Deployable Structure

Sinan Korkmaz

Biomimetic structures are structures that demonstrate increased functionality through mimicking qualities of biological organisms. Self-repair and adaptation mechanisms are examples of biological qualities that can be adapted in structural engineering. Ove ...

EPFL2009

Experimental observation of slow mode dispersion in photonic crystal coupled-cavity waveguides

Romuald Houdré, Nicolas Le Thomas, Jana Jágerská, Vasily Zabelin, Roel Baets

We experimentally investigate the dispersion curve of an integrated silicon-on-insulator coupled-cavity waveguide in a photonic crystal environment using a technique based on far-field imaging. We show that a chain of eight coupled cavities of a moderate Q ...

Optical Society of America2009

Microlenses on Bragg Reflectors to Create Iridescent Colors

Hans Peter Herzig, Toralf Scharf

In nature strong colors play an important role in scaring away predators or finding a mate. Often, the strongest and brightest colors arise from coherent scattering and reflection on periodic structures on a length scale of several micro- or nanometers. Un ...

2008

Adaptive civil engineering structures

Bernard Adam

Most civil structures are passive and static. They are designed according to serviceability and safety requirements. When subjected to actions, they generally deflect in a passive manner. For example, they do not adapt actively to external loading. A more ...

EPFL2007

Focus/detector system of an x-ray apparatus for generating phase contrast recordings

Christian David

A focus/detector system of an X-ray apparatus and a method for generating projective or tomographic phase contrast recordings, are disclosed. In an embodiment of the system, the system includes a beam source equipped with a focus and a focus-side source gr ...

2007

Guided acoustic wave Brillouin scattering in photonic crystal fibers

We experimentally investigate guided acoustic wave Brillouin scattering in several photonic crystal fibers by use of the so-called fiber loop mirror technique and show a completely different dynamics with respect to standard all-silica fibers. In addition ...

Optical Society of America2007

Metalated 1-(p-methoxybenzyl)pyrazole: a structural chameleon

Levente Ondi

When treated with either butyllithium or lithium diisopropylamide, 1-(p-methoxybenzyl)pyrazole undergoes metalation at the exocyclic alpha-position but mutates to the 5-lithio species in the course of a few minutes or hours. Trapping the intermediates with ...

2006

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