Simultaneous phase and amplitude aberration sensing with a liquid-crystal vector-Zernike phase mask

Instrumentatio

Producing true-color rainbows with patterned multi-layer liquid-crystal polarization gratings

Instrumentatio

First light of a holographic aperture mask: observation at the Keck OSIRIS Imager

Instrumentatio

On-sky Performance Analysis of the Vector Apodizing Phase Plate Coronagraph on MagAO/Clio2

Stars and planetary systemsInstrumentatio

Vector-apodizing phase plate coronagraph: design, current performance, and future development [Invited]

Instrumentatio

Multi-color holography with a two-stage patterned liquid-crystal element

Computer-generated geometric phase holograms (GPHs) can be manufactured with high efficiency and high fidelity using photo-aligned liquidvcrystals. GPHs are diffractive elements, which therefore have a wavelength-dependent output and can generally not be used for the production of color imagery. We implement a two-stage approach that first uses the wavelength-dependent diffraction to separate colors, and second, directs these colors through separate holographic patterns. Moreover, by utilizing the geometric phase, we obtain diffraction efficiencies close to 100% for all wavelengths. We successfully create a white light hologram from RGB input in the lab. We demonstrate that this schematic allows for full control over individual (RGB) channels and can be used for wide-gamut holography by selecting any combination of wavelengths. In addition, we show with simulations how this two-stage element could be used for of true-color holograms.Instrumentatio

Printing of monolithic polymeric microstructures using reactive mesogens

Printing of well defined micro-structures using a soft lithographic technique based on liquid crystalline inks is presented. Monolithic structures with tunable macromolecular organization can be locally printed with a variety of optical functionalities. Applications in the fields of displays and security- features are shown