Results 51 to 60 of about 5,580 (232)
Sensors, 2021 Surface reconstruction for micro-samples with large discontinuities using digital holography is a challenge. To overcome this problem, multi-incidence digital holographic profilometry (MIDHP) has been proposed. MIDHP relies on the numerical generation of
Moncy Sajeev Idicula +5 more
doaj +1 more source
Focusing property of autofocusing Bessel beams
Optics Express, 2023 We introduce what we believe to be a new family of abruptly autofocusing waves named autofocusing Bessel beams (ABBs). Since the beams only strongly influence the area near the focus, it holds promise for medical laser treatment and optical tweezers. By the angular spectrum method, ABBs are proved to be a class solution for the Helmholtz equation.
Zhoulin Ding +4 more
openaire +2 more sources
An optimum design of a ring Airyprime beam array based on dimensionless eccentric position
Results in PhysicsThe beam array with abruptly autofocusing capability weakens the turbulence effect in free space optical (FSO) communication systems with relatively low complexity, thereby improving the communication quality of FSO communication systems.
Yi-Min Zhou +4 more
doaj +1 more source
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
Accessible digital ophthalmoscopy based on liquid-lens technology [PDF]
, 2015 Ophthalmoscopes have yet to capitalise on novel low-cost miniature optomechatronics, which could disrupt ophthalmic monitoring in rural areas. This paper demonstrates a new design integrating modern components for ophthalmoscopy.
Bergeles, C +8 more
core +1 more source
Mathieu and Weber tightly autofocusing beams
Optics Express, 2023 We theoretically investigate the propagation dynamics of vectorial Mathieu and Weber tightly autofocusing beams, which are constructed based on nonparaxial Weber and Mathieu accelerating beams, respectively. They can automatically focus along the paraboloid and ellipsoid, and the focal fields represent the tightly focusing properties resembling that ...
Zhaojin Guo +4 more
openaire +2 more sources
Temporal cloaking with accelerating wave packets
, 2014 We theoretically propose a temporal cloaking scheme based on accelerating wave packets. A part of a monochromatic lightwave is endowed with a discontinuous nonlinear frequency chirp, so that two opposite accelerating caustics are created in space-time as
Chremmos, Ioannis
core +1 more source
Enhanced Rapid Autofocus Back-Projection for PBSAR Based on the GEO Satellite
Remote SensingThe passive bistatic synthetic aperture radar (PBSAR) is recognized as a critical developmental direction for future radar systems. To validate its operational feasibility, we designed a PBSAR system. However, significant measurement errors were observed
Te Zhao +4 more
doaj +1 more source
Linear and nonlinear waves in surface and wedge index potentials [PDF]
, 2012 We study optical beams that are supported at the surface of a medium with a linear index potential and by a piecewise linear wedge type potential. In the linear limit the modes are described by Airy functions.
Efremidis, Nikolaos K. +2 more
core +1 more source
Sensors, 2017 A high resolution inverse synthetic aperture radar (ISAR) technique is presented using modified Doppler history based motion compensation. To this purpose, a novel wideband ISAR system is developed that accommodates parametric processing over extended ...
Jung-Hwan Song +3 more
doaj +1 more source