Results 81 to 90 of about 96,711 (321)
Angle‐ and Polarization‐Tolerant Metasurface Designs Based on the Aperiodic Tiling
Advanced Optical Materials, EarlyView.A novel aperiodic metasurface design is introduced to mitigate the inherent angle and polarization sensitivity of conventional metasurfaces. By employing a recently discovered aperiodic tiling approach, identical elliptical scatterers are arranged with systematic variations in their spacing and orientation, effectively minimizing spectral reflectance ...
Minyeul Lee, Suwan Jeon, Jonghwa Shin
wiley +1 more source
Phase sensor for solar adaptive-optics [PDF]
, 2011 Wavefront sensing in solar adaptive-optics is currently done with correlating Shack-Hartmann sensors, although the spatial- and temporal-resolutions of the phase measurements are then limited by the extremely fast computing required to correlate the sensor signals at the frequencies of daytime atmospheric-fluctuations.
arxiv +1 more source
Focus diverse phase retrieval testbed development of continuous wavefront sensing for space telescope applications [PDF]
arXiv, 2023 Continuous wavefront sensing on future space telescopes allows relaxation of stability requirements while still allowing on-orbit diffraction-limited optical performance. We consider the suitability of phase retrieval to continuously reconstruct the phase of a wavefront from on-orbit irradiance measurements or point spread function (PSF) images.
arxiv
, 2018 Precision wavefront control on future segmented-aperture space telescopes presents significant challenges, particularly in the context of high-contrast exoplanet direct imaging.
Cahoy, Kerri L. +6 more
core +1 more source
James Webb Space Telescope Optical Simulation Testbed I: Overview and First Results [PDF]
, 2014 The James Webb Space Telescope (JWST) Optical Simulation Testbed (JOST) is a tabletop workbench to study aspects of wavefront sensing and control for a segmented space telescope, including both commissioning and maintenance activities.
Anderson, Rachel +15 more
core +1 more source
Advanced Optical Materials, EarlyView.Laser‐induced graphene (LIG) on a colorless polyimide (CPI) substrate functions as both an electrical heater and a heat spreader, enabling rapid electro‐thermo‐optic actuation. The system achieves reflective beam scanning up to 2 kHz and diffractive beam steering with 0.5‐millidegree resolution and a 0.9 s response time, showcasing LIG‐CPI as a soft ...
Byunggi Kim +5 more
wiley +1 more source
Spin‐Orbit Photonics with Potato Starch Lenses
Advanced Optical Materials, EarlyView.Native potato starch spherulites are introduced as volumetric optical elements that modulate both dynamic and geometric phases of light. These spherulites focus light and generate optical vortices via spin‐orbit interaction, functioning as polarization‐sensitive microlenses. Their unique radial anisotropy enables applications in vortex beam generation,
Petr Bouchal +4 more
wiley +1 more source
Wavefront Sensing and Control with the Many Headed Hydra Modal Basis [PDF]
arXiv, 2022 The future of space and ground based telescopes is intimately tied to technology and algorithm development surrounding wavefront sensing and control. Only with cutting edge developments and unusual ideas will we be able to build diffraction limited observatories on the ground that contend with earth-atmosphere, as well as space-based observatories that
arxiv
, 2018 Coronagraphs on future space telescopes will require precise wavefront correction to detect Earth-like exoplanets near their host stars. High-actuator count microelectromechanical system (MEMS) deformable mirrors provide wavefront control with low size ...
Allan, Gregory +11 more
core +1 more source
Topology Optimization Enables Freeform Matrix Fourier Optics
Advanced Optical Materials, EarlyView.A topology‐optimized freeform metasurface is designed and fabricated to realize matrix Fourier optics, enabling the diffraction of multiple polarization states into distinct far‐field orders. By combining forward design with gradient‐based inverse optimization, high polarization contrast of up to 98.7% is achieved.
Yu‐Tzu Liu +5 more
wiley +1 more source