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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 ...
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 ...
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 ...
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 ...
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 ...
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
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 ...
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 ...
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 ...
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 ...