Strong spatial dispersion in time-modulated dielectric media
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Title
Strong spatial dispersion in time-modulated dielectric mediaAuthor (s)
Date
2020Publisher
American Physical SocietyISSN
2469-9950; 2469-9969Bibliographic citation
TORRENT, Dani. Strong spatial dispersion in time-modulated dielectric media. Physical Review B, 2020, vol. 102, no 21, p. 214202.Type
info:eu-repo/semantics/articlePublisher version
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.102.214202Version
info:eu-repo/semantics/publishedVersionAbstract
We present an effective medium description of time-modulated dielectric media. By taking the averaged fields
over one modulation period, the relationship between them is derived, therefore defining the different ... [+]
We present an effective medium description of time-modulated dielectric media. By taking the averaged fields
over one modulation period, the relationship between them is derived, therefore defining the different constitutive
parameters. In the most general situation, it is found that the effective material is described by means of a
spatially and temporally dispersive transverse dielectric function and a constant longitudinal dielectric function.
It has been also found that the frequency dependence in the former is weak, in comparison with its wavenumber
dependence (spatial dispersion). Different physical consequences of this spatial dispersion are discussed, with
special emphasis on the weak dispersion approximation and the limit in which it is found that the effective
material behaves as a resonant and isotropic magnetodielectric medium with no additional longitudinal mode,
as it is commonly found in spatially dispersive materials. Time-dependent media therefore opens an alternative
way of designing dynamically tunable metamaterials [-]
Is part of
Physical Review B, 2020, vol. 102, no 21.Funder Name
Ministerio de Ciencia, Innovación y Universidades
Project code
RTI2018-093921-A-C42 | RYC-2016-21188
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©2020 American Physical Society
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