Results 31 to 40 of about 61,868 (235)

Generation of hexagonal close-packed ring-shaped structures using an optical vortex

Nanophotonics, 2021
An optical vortex possesses a ring-shaped spatial profile and orbital angular momentum (OAM) owing to its helical wavefront. This form of structured light has garnered significant attention in recent years, and it has enabled new investigations in ...
Kawaguchi Haruki, Umesato Kei, Takahashi Kanta, Yamane Keisaku, Morita Ryuji, Yuyama Ken-ichi, Kawano Satoyuki, Miyamoto Katsuhiko, Kohri Michinari, Omatsu Takashige   +9 more
doaj   +1 more source

Electromagnetic vortex lines riding atop null solutions of the Maxwell equations

, 2003
New method of introducing vortex lines of the electromagnetic field is outlined. The vortex lines arise when a complex Riemann-Silberstein vector $({\bm E} + i{\bm B})/\sqrt{2}$ is multiplied by a complex scalar function $\phi$. Such a multiplication may
Bateman H, Berry M V, Bialynicki-Birula I, Bialynicki-Birula I, Bialynicki-Birula I, Bialynicki-Birula I, Dennis M R, Iwo Bialynicki-Birula, Kaiser G, Penrose R, Robinson I, Robinson I, Robinson I, Robinson I, Trautman A   +14 more
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Using superoscillations for superresolved imaging and subwavelength focusing

Nanophotonics, 2018
It is now well-appreciated that a bandlimited wave can possess oscillations much more rapidly than those predicted by the bandlimit itself, in a phenomenon known as superoscillation.
Gbur Greg
doaj   +1 more source

Fast finite difference solvers for singular solutions of the elliptic Monge-Amp\`ere equation

, 2010
The elliptic Monge-Ampere equation is a fully nonlinear Partial Differential Equation which originated in geometric surface theory, and has been applied in dynamic meteorology, elasticity, geometric optics, image processing and image registration ...
A.M. Oberman, Ambrosio, B.D. Froese, Bakelman, Benamou, Benamou, Budd, Caffarelli, Caffarelli, Cohen-Or, Crandall, Dean, Dean, Delzanno, Evans, Feng, Feng, Frisch, Froese, Glimm, Gutiérrez, Haker, Haker, Haltiner, Kasahara, Loeper, Oberman, Oberman, Oberman, Oliker, Pogorelov, Stojanovic, Stoker, Strang, ur Rehman, Urbas, Villani, Westcott, Zheligovsky   +38 more
core   +1 more source

Singular pseudodifferential calculus for wavetrains and pulses [PDF]

, 2014
International audienceWe develop a singular pseudodifferential calculus. The symbols that we consider do not satisfy the standard decay with respect to the frequency variables. We thus adopt a strategy based on the Calderon-Vaillancourt Theorem.
Coulombel, Jean-François, Guès, Olivier, Williams, Mark   +2 more
core   +3 more sources

Singular optics and topological photonics [PDF]

Journal of Optics, 2016
For centuries, singularities in wave fields have been a mainstay of interest in multiple areas of physics, ranging from plasma physics, fluid dynamics and atmospheric physics to optics and photonics [1]. In optics, energy and momentum flow around singularities in the interference field can twist to form vortices, which carry angular momentum [2–4 ...
Soskin, Marat, Boriskina, Svetlana V, Chong, Yidong, Dennis, Mark R, Desyatnikov, Anton   +4 more
openaire   +2 more sources

New optical solitons of space-time conformable fractional perturbed Gerdjikov-Ivanov equation by sine-Gordon equation method

Results in Physics, 2018
This paper devotes to conformable fractional space-time perturbed Gerdjikov-Ivanov (GI) equation which appears in nonlinear fiber optics and photonic crystal fibers (PCF). We consider the model with full nonlinearity in order to give a generalized flavor.
Elif Yaşar, Yakup Yıldırım, Emrullah Yaşar   +2 more
doaj   +1 more source

Quasi-geometrical Optics Approximation in Gravitational Lensing

, 2004
The gravitational lensing of gravitational waves should be treated in the wave optics instead of the geometrical optics when the wave length $\lambda$ of the gravitational waves is larger than the Schwarzschild radius of the lens mass $M$.
Baraldo, Bartelmann, Bontz, De Paolis, De Paolis, Deguchi, Nakamura, Navarro, Ohanian, Peters, Press, R. Takahashi, Ruffa, Seto, Takahashi, Zakharov   +15 more
core   +1 more source

Invisibility and Inverse Problems [PDF]

, 2008
This survey of recent developments in cloaking and transformation optics is an expanded version of the lecture by Gunther Uhlmann at the 2008 Annual Meeting of the American Mathematical Society.Comment: 68 pages, 12 figures.
Greenleaf, Allan, Kurylev, Yaroslav, Lassas, Matti, Uhlmann, Gunther   +3 more
core   +2 more sources

The plurality of optical singularities [PDF]

Journal of Optics A: Pure and Applied Optics, 2004
This collection of papers arose from an Advanced Research Workshop on Singular Optics, held at the Bogolyubov Institute in Kiev, Ukraine, during 24–28 June 2003. The workshop was generously financed by NATO, with welcome additional support from Institute of Physics Publishing and the National Academy of Sciences of Ukraine.
Berry, MV, Dennis, MR, Soskin, MS
openaire   +3 more sources