Wolfgang Osten

TL;DR: In this paper , the tilted wave principle was implemented in a Twyman-Green type setup with a separate reference arm, which is intrinsically susceptible to environmentally induced phase disturbances.

TL;DR: In this article, the authors proposed to extend the Grating Interferometry scheme by Digital Holography, where the grating is directly integrated into the surface, allowing measuring the displacement of that surface under long term conditions within the magnitude of the used wavelength.

TL;DR: In this paper, a sensor design due to an aperiodic diffractive element working as microlens array allows the use of small and cost-efficient detector chips for industrial inspection.

Abstract: Plasmonic microcavities are compact systems having the capability to confine light in an extremely small volume. Light matter interactions can therefore be mediated very effectively by them. In this report we demonstrate experimentally that dispersion of photonic cavity modes can be tuned to a large degree in a plasmonic microcavity with two identical corrugated metallic films as resonant mirrors. The modification of the dispersion is induced by interactions between the photonic and plasmonic modes. Additionally, the excited surface waves are strongly enhanced by the gratings, which is important for coupling and enhancing evanescent fields. To realize such a cavity, we employed self-assembled monolayer nanosphere crystals as a prepatterned substrate. Metal/dielectric/metal films were subsequently deposited on it. The cavity length was used to tune the interaction strength. As a result, the original positively dispersive FP mode, i.e., the resonance frequency is increased with the incident angle, becomes independent or even negatively dependent on the incident angle. Due to the hexagonal textured corrugation of the metal film and the existence of some line defects in a large area, the optical response is isotropic and independent of the specific polarization. This behavior can have potential applications for light emission devices, plasmonic color filters and subwavelength imaging.

TL;DR: In this paper, the radiative reflective properties of a calibration standard rough surface were simulated by ray tracing and the Finite-difference time-domain (FDTD) method, and the simulation results have been used to compute the reflectance distribution functions (BRDF) of metal surfaces and have been compared with experimental measurements.