Personne

Toralf Scharf

Cette personne n’est plus à l’EPFL

Publications associées (161)

Confocal microscopy using variable-focal-length microlenses and an optical fiber bundle

Liza Carol Andrea Dunbar, Toralf Scharf, Lin Yang

The use of variable-focal-length (VFL) microlenses can provide a way to axially scan the foci across a sample by electronic control. We demonstrate an approach to coupling VFL microlenses individually to a fiber bundle as a way to create a high-throughput ...

2005

On the coupling and transmission of transverse and longitudinal fields into fully metal-coated optical nano-probes

Hans Peter Herzig, Toralf Scharf, Laure Aeschimann

Fully-metal-coated near-field optical probes, based on a cantilever design, have been studied theoretically and experimentally. Numerical simulations prove that these structures allow non-zero modal emission of the electromagnetic field trough a 60 nm thic ...

2005

Compact liquid-crystal-polymer Fourier-transform spectrometer

René Dändliker, Toralf Scharf, Gerben Boer

We present the optical design and realization of a low-resolution liquid-crystal (LC) Fourier-transform spectrometer (FTS). This FTS is based on a polarization interferometer that has a Wollaston prism made of a LC material as a key component. It has a com ...

2004

Static birefringent microlenses

Toralf Scharf

We introduce a new concept for the fabrication of birefringent microlenses with high quality and give an overview of existing static birefringent microlens technology. It is shown that liquid crystal monomers and polymers can be used to fabricate high-qual ...

2004

Liquid crystal alignment on replicated nanostructured surfaces

Toralf Scharf

Interaction of liquid crystals with nanostructured surfaces is studied experimentally. Whereas photolithographic or ATM methods mere used in the past for surface structuring, we use besides photolithography essentially replication methods for the creation ...

2004

Artifical compound eyes - Different concepts and their application to ultra flat image acquisition sensors

Hans Peter Herzig, Toralf Scharf

Two different approaches for ultra flat image acquisition sensors on the basis of artificial compound eyes are examined. In apposition optics the image reconstruction is based on moiré- or static sampling while the superposition eye approach produces an ov ...

2004

Reflection of multi-domain structured cholesteric liquid crystals

Toralf Scharf

The simulation of polymer-dispersed cholesteric liquid crystals is carried out using a model, which takes into account the domain structure of the layer. The model is based on the 4x4 matrix calculation method of Berreman. One considers different orientati ...

SPIE-The International Society for Optical Engineering, Bellingham, USA2003

Depolarization effects of light reflected by domain-structured cholesteric liquid crystals

Toralf Scharf

The simulation of light reflected by polymer-dispersed cholesteric liquid crystals is carried out using a model that takes into account the domain structure of the layer. The model is based on the 4×4 matrix calculation method of Berreman. One considers di ...

2002

Light propagation through alignment-patterned liquid crystal gratings

Toralf Scharf

We analysed the light propagation through alignment-patterned liquid crystal films where the alignment is planar and homeotropic for different domains, respectively. Using elastic theory the nematic director field can be analytically calculated with the me ...

2002

Analysis of nematic-liquid-crystal binary gratings with high spatial frequency

Toralf Scharf

The behavior of nematic liquid crystals in spatially varying electrical fields is investigated. Director profiles of nematic-liquid-crystal phase gratings are simulated for different orientations of the liquid-crystal director field with respect to the ele ...

2000

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