Carsten Rockstuhl

Ultrasonic metamaterial at MHz frequencies using microstructured glass

Acoustic metamaterials enhance traditional material properties, providing opportunities to shape sound fields in applications ranging from biomedical imaging and clinical therapy to nondestructive testing. However, at the megahertz frequency range, only a few metamaterial archite...

Reconfigurable Light Field Generation With Hologram‐Enhanced Multicore Fibers

ABSTRACT Tailoring light fields at remote or confined locations is a key requirement for many emerging photonic technologies. Here, a multicore fiber functionalized with a 3D‐printed hologram for the reconfigurable generation of structured light distributions is demonstrated. A c...

Exceptional points, lasing, and coherent perfect absorption in Floquet scattering systems

Abstract Periodically time-varying media, known as photonic time crystals (PTCs), provide a promising platform for observing unconventional wave phenomena. We analyze the scattering of electromagnetic waves from spatially finite PTCs using the multispectral Floquet scattering mat...

Defocus-Insensitive Microscopy via Spatial Phase Modulation Using End-to-End Learning

Abstract In optical microscopy, high spatial resolution comes at the cost of a short depth of field. This trade-off prevents the formation of sharp images of three-dimensional objects or objects moving in and out of focus. Moreover, it is often difficult to know the extent to whi...

Pole-Expansion of the T-Matrix Based on a Matrix-Valued AAA-Algorithm

Abstract The transition matrix (T-matrix) is a complete description of an object’s linear scattering response. As such, it has found wide adoption for the theoretical and computational description of multiple-scattering phenomena. In its original form, the T-matrix describes the...