131 citations · 349 across the 17 of their papers we have counts for
8 papers · 1 filter
Diffraction-limited axial scanning in thick biological tissue employing an aberration correcting adaptive lens
Katrin Philipp, Florian Lemke, Stefan Scholz +4
Diffraction-limited focusing deep into biological tissue is challenging due to spherical aberrations that lead to a broadening of the focal spot particularly in axial direction. Wh…
Inverse design method for metalens with optical vortices towards light focusing through localized phase retardation
Yongbo Deng, Ulrike Wallrabe, Yihui Wu +1
Metalenses can achieve diffraction-limited focusing through localized phase manipulation of the incoming light beam. Because these structures are ultrathin, less than a wavelength,…
Depth-controlled Bessel beams
Angelina Müller, Matthias C. Wapler, Ulrike Wallrabe
We present a ring aperture with independently switchable segments for the three-dimensional control of quasi propagation invariant beams. We demonstrate that our liquid crystal des…
Topological in-plane polarized piezo actuation for compact adaptive lenses with aspherical correction
Florian Lemke, Moritz Stürmer, Ulrike Wallrabe +1
In this contribution, we investigate the effects of using in-plane polarized piezo actuators with topological buckling displacement to drive glass-piezo composite membranes for ada…
Single-Sided Contacting of Out-of-Plane Polarized Piezo Films for Fluid Membrane Lenses
Moritz Stürmer, Matthias C. Wapler, Ulrike Wallrabe
We present an adaptive lens which tunes its focal length with a glass membrane that is deformed by an integrated piezo bending actuator. A particular challenge in the fabrication o…
A compact, large-aperture tunable lens with adaptive spherical correction
Matthias C. Wapler, Moritz Stürmer, Ulrike Wallrabe
In this paper, we present the proof of concept of a very fast adaptive glass membrane lens with a large aperture/diameter ratio, spherical aberration correction and integrated actu…
Focusing Mirror with Tunable Eccentricity
Moritz Stürmer, Matthias C. Wapler, Jens Brunne +1
We present a new kind of varifocal mirror with independently adjustable curvatures in the major directions. For actuation we use two stacked piezo bending actuators with crossed in…
Freeform high-speed large-amplitude deformable Piezo Mirrors
Matthias C Wapler, Jens Brunne, Ulrike Wallrabe
We present a new type of tunable mirror with sharply-featured freeform displacement profiles, large displacements of several 100μm and high operating frequencies close to the kHz r…