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View article: Predicting Wetting Properties for Surfaces with Stochastic Topography
Predicting Wetting Properties for Surfaces with Stochastic Topography Open
Understanding the influence of topography on wettability is essential for improving the modeling of superhydrophobic surfaces. Moreover, wetting predictions can foresee corrosion, biological contamination, self-cleaning properties, and all…
View article: PULSE FORM OPTIMIZATION FOR MIMO SONAR SYSTEMS
PULSE FORM OPTIMIZATION FOR MIMO SONAR SYSTEMS Open
Essential for the MIMO principle is the ability to separate the transmitter signals from each other at the receiver-side signal processing.Signal separation methods are typically divided into the categories Time-Division-Multiplexing (TDM)…
View article: Heterostructure Films of SiO2 and HfO2 for High-Power Laser Optics Prepared by Plasma-Enhanced Atomic Layer Deposition
Heterostructure Films of SiO2 and HfO2 for High-Power Laser Optics Prepared by Plasma-Enhanced Atomic Layer Deposition Open
Absorption losses and laser-induced damage threshold (LIDT) are considered to be the major constraints for development of optical coatings for high-power laser optics. Such coatings require paramount properties, such as low losses due to o…
View article: A Model Surface for Calculating the Reflectance of Smooth and Rough Aluminum Layers in the Vacuum Ultraviolet Spectral Range
A Model Surface for Calculating the Reflectance of Smooth and Rough Aluminum Layers in the Vacuum Ultraviolet Spectral Range Open
We present a systematic approach to calculating the reflectance of aluminum thin films. In our approach, the rough aluminum surface is modelled as a square array of submicrometer-sized oblate cylinders. The focus of the study is on the vac…
View article: Spectrophotometric Characterization of Thin Semi-Transparent Aluminum Films Prepared by Electron Beam Evaporation and Magnetron Sputtering
Spectrophotometric Characterization of Thin Semi-Transparent Aluminum Films Prepared by Electron Beam Evaporation and Magnetron Sputtering Open
Aluminum thin films with thicknesses between approximately 10 and 60 nm have been deposited by evaporation and sputtering techniques. Layer characterization focused on reflectance, optical constants, and surface quality. Reflectance fits h…
View article: Direct Growth of Monolayer MoS$_2$ on Nanostructured Silicon Waveguides
Direct Growth of Monolayer MoS$_2$ on Nanostructured Silicon Waveguides Open
We report for the first time the direct growth of Molybdenum disulfide (MoS$_2$) monolayers on nanostructured silicon-on-insulator waveguides. Our results indicate the possibility of utilizing the Chemical Vapour Deposition (CVD) on nanost…
View article: Plasma-Enhanced Atomic Layer Deposition of HfO<sub>2</sub> with Substrate Biasing: Thin Films for High-Reflective Mirrors
Plasma-Enhanced Atomic Layer Deposition of HfO<sub>2</sub> with Substrate Biasing: Thin Films for High-Reflective Mirrors Open
Tuning ion energies in plasma-enhanced atomic layer deposition (PEALD) processes enables fine control over the material properties of functional coatings. The growth, structural, mechanical, and optical properties of HfO2 thin f…
View article: Hybridized Exciton-Photon-Phonon States in a Transition Metal Dichalcogenide van der Waals Heterostructure Microcavity
Hybridized Exciton-Photon-Phonon States in a Transition Metal Dichalcogenide van der Waals Heterostructure Microcavity Open
Excitons in atomically thin transition-metal dichalcogenides (TMDs) have been established as an attractive platform to explore polaritonic physics, owing to their enormous binding energies and giant oscillator strength. Basic spectral feat…
View article: Light Scattering from Contamination and Defects - Measurement, Analysis, and Modelling
Light Scattering from Contamination and Defects - Measurement, Analysis, and Modelling Open
Light scattering induced by contamination and defects on optical components can quickly limit the component’s performance. Therefore, imperfection analysis and budgeting are mandatory - but also challenging tasks. On the other hand, imperf…
View article: Low Temperature Ion Beam Sputtered Optical Coatings
Low Temperature Ion Beam Sputtered Optical Coatings Open
The effect of low temperature ion beam sputtering on thin film properties was investigated. The SiO 2 and Ta 2 O 5 films grown at 0°C show a trend of lower optical losses and higher LIDT compared to 100°C.
View article: Experimental investigation of a virtual planar array for MIMO sonar systems
Experimental investigation of a virtual planar array for MIMO sonar systems Open
In this paper a way to achieve a virtual two-dimensional planar array for sonar systems using the multiple input multiple output (MIMO) principle is presented. The time delay information of a planar array can be used for imaging sonars and…
View article: Special Section Guest Editorial: Frontiers of Optical Coatings
Special Section Guest Editorial: Frontiers of Optical Coatings Open
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View article: Au coatings for spaced based reflectors
Au coatings for spaced based reflectors Open
Gold shows a very high reflectivity in the IR range. In addition, Au (and protected Au) is more robust than Ag (and protected Ag). Therefore, Au based coatings are of high interest. Common techniques for the deposition of optical Au coatin…
View article: Experimental demonstration of the angular resolution enhancement of a monostatic MIMO sonar
Experimental demonstration of the angular resolution enhancement of a monostatic MIMO sonar Open
In this contribution we show by experimental tests the improvement of the angular resolution of an active monostatic Sonar system when using the Multiple-Input-Multiple-Output (MIMO) principle. This principle allows the design of a high-re…
View article: Black and white fused silica: modified sol-gel process combined with moth-eye structuring for highly absorbing and diffuse reflecting SiO<sub>2</sub> glass
Black and white fused silica: modified sol-gel process combined with moth-eye structuring for highly absorbing and diffuse reflecting SiO<sub>2</sub> glass Open
Diffuse reflecting (white) and highly absorbing (black) fused silica based materials are presented, which combine volume modified substrates and surfaces equipped with anti-reflective moth-eye-structures. For diffuse reflection, micrometer…
View article: Light scattering characterization of single-layer nanoporous SiO<sub>2</sub> antireflection coating in visible light
Light scattering characterization of single-layer nanoporous SiO<sub>2</sub> antireflection coating in visible light Open
Antireflective coatings are widely applied on transparent optical components to reduce reflections at surfaces. Nanoporous silica (NP ) thin films with tailored refractive index properties are used as single-layer antireflective c…
View article: Linear and Nonlinear Absorption of Titanium Dioxide Films Produced by Plasma Ion-Assisted Electron Beam Evaporation: Modeling and Experiments
Linear and Nonlinear Absorption of Titanium Dioxide Films Produced by Plasma Ion-Assisted Electron Beam Evaporation: Modeling and Experiments Open
Titanium dioxide films were prepared by plasma ion-assisted electron beam evaporation. Linear optical properties were investigated in terms of spectrophotometry using the beta-distributed oscillator (ß_do) model as a parametrized dispersio…
View article: Small Scale Surface Roughness of Ryugu
Small Scale Surface Roughness of Ryugu Open
View article: International round-robin experiment for angle-resolved light scattering measurement
International round-robin experiment for angle-resolved light scattering measurement Open
An international round-robin experiment has been conducted to test procedures and methods for the measurement of angle-resolved light scattering. ASTM E2387-05 has been used as the main guide, while the experience gained should also contri…
View article: Stray light reduction of silicon particle reinforced aluminum for optical systems
Stray light reduction of silicon particle reinforced aluminum for optical systems Open
Silicon particle reinforced aluminum containing 42 wt.% silicon (Al-42Si) offers higher specific stiffness, higher resistance to thermal gradients, and an athermal behavior combined with electroless nickel, in comparison to state-of-the-ar…
View article: Special Section Guest Editorial: Ultraprecision Optics Fabrication and Characterization
Special Section Guest Editorial: Ultraprecision Optics Fabrication and Characterization Open
This guest editorial introduces the Special Section on Ultraprecision Optics Fabrication and Characterization. This special section covers a wide range of advanced high-precision optical manufacturing technologies that push the limits for …
View article: Morphology and measurement of fractal dimension of boulders on Ryugu
Morphology and measurement of fractal dimension of boulders on Ryugu Open
View article: Multifunctional contamination-resistant coatings
Multifunctional contamination-resistant coatings Open
Surface contaminations can critically affect the performance of optical surfaces, in particular with respect to light scattering, optical losses, and laser stability. Thus, avoiding contaminations and reducing contamination-induced effects…
View article: Light scattering techniques for the characterization of optical components
Light scattering techniques for the characterization of optical components Open
The rapid developments in optical technologies generate increasingly higher and sometimes completely new demands on the quality of materials, surfaces, components, and systems. Examples for such driving applications are the steadily shrink…
View article: Light scattering characterization of optical components for space applications
Light scattering characterization of optical components for space applications Open
Light scattering can critically affect the performance of high-end optical systems. For instance, unavoidable but small residual imperfections of optical components such as surface or coating roughness, bulk inhomogeneities, and defects as…
View article: Reducing light scattering from surface contaminations by thin film design
Reducing light scattering from surface contaminations by thin film design Open
In most applications, contamination of optical thin film coatings is inevitable over time. State-of-the art approaches to tackle this problem are usually based on two strategies – avoiding contamination or removing already existing contami…
View article: 2-(1,2,3-Triazol-4-yl)-imidazoline, -oxazoline, -thiazoline and -tetrahydropyrimidine as ligands in copper(II) and nickel(II) complexes
2-(1,2,3-Triazol-4-yl)-imidazoline, -oxazoline, -thiazoline and -tetrahydropyrimidine as ligands in copper(II) and nickel(II) complexes Open
2-(1-Benzyl-1 H -1,2,3-triazol-4-yl)-imidazolines ( L1 and L2 / L2 ′), -1,3-oxazoline ( L3 ), -1,3-thiazoline ( L4 ) and -tetrahydropyrimidine ( L5 ) were prepared in one step from a 1,2,3-triazole-4-carboxamidinium tetraphenylborate and s…
View article: CCDC 1446994: Experimental Crystal Structure Determination
CCDC 1446994: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: Bewertung von Nanorauheiten durch Streulichtmessung / Nano-roughness Assessment by Light Scattering Measurement
Bewertung von Nanorauheiten durch Streulichtmessung / Nano-roughness Assessment by Light Scattering Measurement Open
View article: CCDC 1446997: Experimental Crystal Structure Determination
CCDC 1446997: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …