Zobrazeno 1 - 10
of 96
pro vyhledávání: '"Galiffi E"'
We develop a compact theory that can be applied to a variety of time-varying dispersive materials. The continuous wave reflection and transmission coefficients are replaced with equivalent operator expressions. In addition to comparing this approach
Externí odkaz:
http://arxiv.org/abs/2208.11778
Structures which appear to move at or near the velocity of light contain singular points. Energy generated by the motion accumulates at these points into ever-narrowing peaks. In this paper we show that energy is generated by a curious process that c
Externí odkaz:
http://arxiv.org/abs/2204.12388
We ask the question 'what happens to Bloch waves in gratings synthetically moving at near the speed of light?'. First we define a constant refractive index (CRI) model in which Bloch waves remain well defined as they break the light barrier, then sho
Externí odkaz:
http://arxiv.org/abs/2110.00956
In gratings travelling at nearly the velocity of light a symmetry breaking transition is observed between free-flowing fluid-like Bloch waves observed at lower grating velocities and, at luminal velocities, condensed, localised states of light captur
Externí odkaz:
http://arxiv.org/abs/2103.16916
Time dependent systems do not in general conserve energy invalidating much of the theory developed for static systems and turning our intuition on its head. This is particularly acute in luminal space time crystals where the structure moves at or clo
Externí odkaz:
http://arxiv.org/abs/2009.12077
Publikováno v:
Nanophotonics 9, 309-316 (2020)
Singular graphene metasurfaces, conductivity gratings realized by periodically suppressing the local doping level of a graphene sheet, have recently been proposed to efficiently harvest THz light and couple it to surface plasmons over broad absorptio
Externí odkaz:
http://arxiv.org/abs/1908.09320
A moving medium drags light along with it as measured by Fizeau and explained by Einstein's theory of special relativity. Here we show that the same effect can be obtained in a situation where there is no physical motion of the medium. Modulations of
Externí odkaz:
http://arxiv.org/abs/1908.05883
Publikováno v:
Phys. Rev. Lett. 123, 206101 (2019)
Time has emerged as a new degree of freedom for metamaterials, promising new pathways in wave control. However, electromagnetism suffers from limitations in the modulation speed of material parameters. Here we argue that these limitations can be circ
Externí odkaz:
http://arxiv.org/abs/1907.08421
Publikováno v:
J. Phys. B 50, 095001 (2017)
A propagation method for the scattering of a quantum wave packet from a potential surface is presented. It is used to model the quantum reflection of single atoms from a corrugated (metallic) surface. Our numerical procedure works well in two spatial
Externí odkaz:
http://arxiv.org/abs/1712.09874
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