Results 61 to 70 of about 44,477 (288)
Mathematics, 2020 Mathematical modelling methods have several limitations when addressing complex physics whose calculations require considerable amount of time. This is the case of adaptive optics, a series of techniques used to process and improve the resolution of ...
Sergio Luis Suárez Gómez +4 more
doaj +1 more source
Development of a wavefront sensor for terahertz pulses
Optics Express, 2016 Wavefront characterization of terahertz pulses is essential to optimize far-field intensity distribution of time-domain (imaging) spectrometers or increase the peak power of intense terahertz sources. In this paper, we report on the wavefront measurement of terahertz pulses using a Hartmann sensor associated with a 2D electro-optic imaging system ...
Abraham, Emmanuel +5 more
openaire +5 more sources
Scalable Lithium Niobate Nanoimprinting for Nonlinear Metalenses
Advanced Materials, EarlyView.A broadband polycrystalline lithium niobate platform is developed for highly versatile and scalable fabrication of nonlinear metasurfaces. This work demonstrates simultaneous second harmonic generation and wavefront‐shaping via a metalens on this platform.
Ülle‐Linda Talts +3 more
wiley +1 more source
Adaptive particle image velocimetry based on sharpness metrics
Journal of the European Optical Society-Rapid Publications, 2018 Background Optical distortions can significantly deteriorate the measurement accuracy in particle image velocimetry systems. Such distortions can occur at fluctuating phase boundaries during flow measurement and result from the accompanied refractive ...
M. Teich +4 more
doaj +1 more source
Using the generalised-optical differentiation wavefront sensor for laser guide star wavefront sensing [PDF]
arXiv, 2020 Laser guide stars (LGS) are used in many adaptive optics systems to extend sky coverage. The most common wavefront sensor used in combination with a LGS is a Shack-Hartmann wavefront sensor (SHWFS). The Shack-Hartmann has a major disadvantage for extended source wavefront sensing because it directly samples the image.
arxiv
Advancement in Colloidal Metasurfaces: Approaches for Scalable Photonic Devices
Advanced Materials Interfaces, EarlyView.This perspective explores colloidal metasurfaces composed of plasmonic and emitting nanoparticles assembled by laser interference lithography and template‐assisted self‐assembly methods. Precise design strategies achieve directional emission, low‐threshold lasing, and tunable photonic bandgaps.
Sezer Seçkin +2 more
wiley +1 more source
Reconfigurable Manipulation of Sound with a Multimaterial 3D Printed Origami Metasurface
Advanced Materials Technologies, EarlyView.This paper demonstrates a programmable origami‐inspired metasurface, using multimaterial three‐dimensional printing technology to achieve reconfigurable sound manipulation. The unique bistable design enables rapid switching between configurations, allowing for precise control of acoustic reflections with minimal mechanical input. The results showcase a
Dinh Hai Le +5 more
wiley +1 more source
Wavefront Derived Refraction and Full Eye Biometry in Pseudophakic Eyes. [PDF]
PLoS ONE, 2016 To assess wavefront derived refraction and full eye biometry including ciliary muscle dimension and full eye axial geometry in pseudophakic eyes using spectral domain OCT equipped with a Shack-Hartmann wavefront sensor.Twenty-eight adult subjects (32 ...
Xinjie Mao +6 more
doaj +1 more source
Non-linear wavefront reconstruction methods for pyramid sensors using Landweber and Landweber-Kaczmarz iteration [PDF]
, 2018 Accurate and robust wavefront reconstruction methods for pyramid wavefront sensors are in high demand as these sensors are planned to be part of many instruments currently under development for ground based telescopes. The pyramid sensor relates the incoming wavefront and its measurements in a non-linear way.
arxiv +1 more source
Film‐Based Multi‐Photon Lithography for Efficient Printing of Electromagnetic Surface Structures
Advanced Materials Technologies, EarlyView.This work introduces film‐based multi‐photon lithography as an efficient method for fabricating electromagnetic surface structures with 2D and 2.5D geometries, particularly THz and mid‐IR metasurfaces. These structures can be fabricated on various substrates, such as glass or silicon‐on‐insulator, over areas ranging from mm2 to cm2, achieving feature ...
Gordon Zyla +6 more
wiley +1 more source