Results 11 to 20 of about 4,513 (162)
Varifocal Meta‐Lens for Multifunctional Focusing and Imaging [PDF]
Advanced Science, Volume 12, Issue 45, December 4, 2025.A varifocal meta‐lens enables dynamic switching between conventional focusing and non‐diffracting autofocusing beams, relying on a phase design with dual interpretations in both real space and the spatial frequency domain. By integrating a Moiré‐based tuning mechanism, the system achieves continuous focal length control in both modes.
Rong Lin +6 more
wiley +2 more sources
Water‐Immersed GaP Huygens’ Meta‐Optics for Visible Structured Light Generation [PDF]
Advanced Science, Volume 12, Issue 34, September 11, 2025.Ultrathin GaP Huygens’ metasurfaces operating in the visible regime generate structured light beams underwater, including focusing Gaussian beams, abruptly autofocusing beams, Bessel beams, and optical vortices. The platform offers enhanced fabrication tolerance and mechanical stability, establishing a robust route toward compact underwater ...
Jia‐Hua Lee +8 more
wiley +2 more sources
Simulation of Laser Propagation in a Plasma with a Frequency Wave Equation [PDF]
, 2007 The aim of this work is to perform numerical simulations of the propagation of a laser in a plasma. At each time step, one has to solve a Helmholtz equation in a domain which consists in some hundreds of millions of cells.
Ballereau +24 more
core +4 more sources
Autofocus for digital Fresnel holograms by use of a Fresnelet-sparsity criterion [PDF]
, 2004 We propose a robust autofocus method for reconstructing digital Fresnel holograms. The numerical reconstruction involves simulating the propagation of a complex wave front to the appropriate distance.
Liebling, Michael, Unser, Michael
core +2 more sources
A Workstation for microassembly [PDF]
, 2007 In this paper, an open-architecture, reconfigurable microassembly workstation for efficient and reliable assembly of micromachined parts is presented.
Kunt, Emrah Deniz +2 more
core +1 more source
Nonparaxial accelerating Bessel-like beams [PDF]
, 2013 A new class of nonparaxial accelerating optical waves is introduced. These are beams with a Bessel-like profile that are capable of shifting laterally along fairly arbitrary trajectories as the wave propagates in free space.
Chremmos, Ioannis +1 more
core +3 more sources
Reflection and refraction of an Airy beam at a dielectric interface [PDF]
, 2012 Reflection and refraction of a finite-power Airy beam at the interface between two dielectric media are investigated analytically and numerically. The formulation takes into account the paraxial nature of the optical beams to derive convenient field ...
Chremmos, Ioannis +1 more
core +3 more sources
Design and control of laser micromachining workstation [PDF]
, 2012 The production process of miniature devices and microsystems requires the utilization of non-conventional micromachining techniques. In the past few decades laser micromachining has became micro-manufacturing technique of choice for many industrial and ...
Baran, Eray Abdurrahman +6 more
core +1 more source
Abruptly autofocusing vortex beams
Optics Express, 2012 We generate abruptly autofocusing beams that produce vortices at the focus. We give explicit equations for the phase-only Fourier masks that generate these beams including explanations for controlling the focal distance and numerical aperture. We show experimental results for the focal distance, the vortex pattern and show that the diameter of the ...
Jeffrey A, Davis +2 more
openaire +2 more sources
Closed-form expressions for nonparaxial accelerating beams with pre-engineered trajectories
, 2015 In this letter, we propose a general real-space method for the generation of nonparaxial accelerating beams with arbitrary predefined convex trajectories. Our results lead to closed-form expressions for the required phase at the input plane.
Efremidis, Nikolaos K. +2 more
core +1 more source