Kristian Buchwald

WILDS: a high-efficiency, wide-band, medium-resolution spectrograph for the Lowell Discovery Telescope

Yahel Sofer Rimalt, Sagi Ben-Ami, Ofir Hershko, Itzik Filizer et autres

Silicon dioxide dry etching by a consumable solid source and He plasma

Marc Bernet, Kristian Buchwald, Dines Nøddegaard Erschens, Jörg Hübner et autres

The semiconductor and photonics industries rely heavily on gases, such as fluorocarbons, hydrofluorocarbons, perfluorinated compounds, and chlorofluorocarbons, for plasma-based processing. However, those gases have a high global warming potential. In the context of increasing sustainability demands and regulatory constraints, alternative etching approaches …

gb, dk (code pays fourni par la source)

Highly selective anisotropic dry etching of smooth SiO2 nanostructures using SF6 plasma and Cr hard mask: Toward sustainable plasma etching

Marc Bernet, Kristian Buchwald, Dines Nøddegaard, Jörg Hübner et autres

Smooth, high-aspect-ratio directional structures in oxides such as silica (SiO2) are essential for efficient diffraction in optical and nanophotonic devices. Achieving these features requires high pattern-transfer fidelity, anisotropic profiles, smooth surfaces, and uniform processing suitable for scalable, high-throughput production. We present a …

gb, dk (code pays fourni par la source)

Nanofabrication and profile tailoring of high index Ta2O5 optical gratings for LiDAR using C4F8/SF6 plasma mixtures

Marco Bernet, Chantal Silvestre, Kristian Buchwald, Jacob Andkjær et autres

Optical elements, such as dielectric meta-surfaces, photonic crystals, nanophotonic waveguide circuits, and diffractive grating couplers are all based on high refractive index materials. In this respect, a highly versatile material is tantalum pentoxide, which features a refractive index above 2 and low …

dk (code pays fourni par la source)

Write the Future

Kristian Buchwald, Nicholas Heng Loong Wong, Sourabh Kumar, Edward H. Chen

OSA’s Centennial “Write the Future” contest asked members of our community to imagine, in a short piece of fiction, what optics and photonics might look like in the next 100 years. The result was a variety of creative visions. A panel of …

Solid-state laser source of narrowband ultraviolet B light for skin disease care with advanced performance

Aleksandr Tarasov, Hong Chu, Kristian Buchwald

Two years ago we reported about the development of solid state laser source for medical skin treatment with wavelength 310.6 nm and average power 200 mW. Here we describe the results of investigation of the advanced version of the laser, which is …

Topology-optimized broadband surface relief transmission grating

Jacob Andkjær, Christian P. Ryder, Peter C. Nielsen, Thomas Rasmussen et autres

We propose a design methodology for systematic design of surface relief transmission gratings with optimized diffraction efficiency. The methodology is based on a gradient-based topology optimization formulation along with 2D frequency domain finite element simulations for TE and TM polarized plane waves. …

dk (code pays fourni par la source)