Zobrazeno 1 - 10
of 4 296
pro vyhledávání: '"Simon, A. R."'
We give an exact application of a recently developed, operator-based theory of wave propagation in dispersive, time-varying media. Using this theory we find that the usual symmetry of complex conjugation plus changing the sign of the frequency, requi
Externí odkaz:
http://arxiv.org/abs/2410.07247
Publikováno v:
Optics Express vol. 31 pp. 37142-37153 (2023)
We derive two methods for simultaneously controlling the resonance frequency, linewidth and multipolar nature of the resonances of radially symmetric structures. Firstly, we formulate an eigenvalue problem for a global shift in the permittivity of th
Externí odkaz:
http://arxiv.org/abs/2308.06179
When light propagates through a complex medium, such as a multimode optical fibre (MMF), the spatial information it carries is scrambled. In this work we experimentally demonstrate an all-optical strategy to unscramble this light again. We first crea
Externí odkaz:
http://arxiv.org/abs/2307.08707
Publikováno v:
Quantum 8, 1357 (2024)
The spin-boson model usually considers a spin coupled to a single bosonic bath. However, some physical situations require coupling of the spin to multiple environments. For example, spins interacting with phonons in three-dimensional magnetic materia
Externí odkaz:
http://arxiv.org/abs/2306.11036
Autor:
Horsley, Simon A. R., Pendry, John B.
Diffraction gratings synthetically moving at trans-luminal velocities contain points where wave and grating velocities are equal. We show these points can be understood as a series of optical event horizons where wave energy can be trapped and amplif
Externí odkaz:
http://arxiv.org/abs/2302.04066
Publikováno v:
J. Phys. A: Math. Theor. 56 275201 (2023)
In this paper, we use graph theory to solve wave scattering problems in the discrete dipole approximation. As a key result of this work, in the presence of active scatterers, we present a systematic method to find arbitrary large-order zero eigenvalu
Externí odkaz:
http://arxiv.org/abs/2301.08257
Autor:
Mididoddi, Chaitanya K., Sharp, Christina, del Hougne, Philipp, Horsley, Simon A. R., Phillips, David B.
The scattering of light impacts sensing and communication technologies throughout the electromagnetic spectrum. Overcoming the effects of time-varying scattering media is particularly challenging. In this article we introduce a new way to control the
Externí odkaz:
http://arxiv.org/abs/2301.04461
Autor:
Natasha E Schoeler, Louise Marston, Laura Lyons, Sally Halsall, Ruchika Jain, Siobhan Titre-Johnson, Maryam Balogun, Simon J R Heales, Simon Eaton, Michael Orford, Elizabeth Neal, Christin Eltze, Elma Stephen, Andrew A Mallick, Finbar O’Callaghan, Shakti Agrawal, Alasdair Parker, Martin Kirkpatrick, Andreas Brunklaus, Ailsa McLellan, Helen McCullagh, Rajib Samanta, Rachel Kneen, Hui Jeen Tan, Anita Devlin, Manish Prasad, Rohini Rattihalli, Helen Basu, Archana Desurkar, Ruth Williams, Penny Fallon, Irwin Nazareth, Nicholas Freemantle, J Helen Cross
Publikováno v:
Efficacy and Mechanism Evaluation, Vol 11, Iss 16 (2024)
Background Many infancy-onset epilepsies have a poor prognosis for seizure control and neurodevelopmental outcome. Ketogenic diets can improve seizures in older children and adults unresponsive to antiseizure medicines. We aimed to determine the effe
Externí odkaz:
https://doaj.org/article/3cbdf6bf151e43c59877574331e8adad
Multi-plane light converters (MPLCs) are an emerging class of optical device capable of converting a set of input spatial light modes to a new target set of output modes. This operation represents a linear optical transformation - a much sought after
Externí odkaz:
http://arxiv.org/abs/2209.11081
Publikováno v:
Phys Rev A 106 053523 (2022)
Utilising the fact that the frequency response of a material can be decomposed into the quasi-normal modes supported by the system, we present two methods to directly manipulate the complex frequencies of quasi-normal modes in the complex plane. We f
Externí odkaz:
http://arxiv.org/abs/2206.13863