Superlattice nonlinearities for Gigahertz-Terahertz generation in harmonic multipliers

Semiconductor superlattices are strongly nonlinear media offering several technological challenges associated with the generation of high-frequency Gigahertz radiation and very effective frequency multiplication up to several Terahertzs. However, charge accumulation, traps and interface defects lead...

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Main Authors: Apostolakis Apostolos, Pereira Mauro F.
Format: Article
Language:English
Published: De Gruyter 2020-07-01
Series:Nanophotonics
Subjects:
Online Access:https://doi.org/10.1515/nanoph-2020-0155
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spelling doaj-6c618137b12a4e398d9be53792859d8c2021-09-06T19:20:35ZengDe GruyterNanophotonics2192-86062192-86142020-07-019123941395210.1515/nanoph-2020-0155Superlattice nonlinearities for Gigahertz-Terahertz generation in harmonic multipliersApostolakis Apostolos0Pereira Mauro F.1Department of Condensed Matter Theory, Institute of Physics, Czech Academy of Sciences, Na Slovance 1999/2, 182 21, Prague, Czech RepublicDepartment of Condensed Matter Theory, Institute of Physics, Czech Academy of Sciences, Na Slovance 1999/2, 182 21, Prague, Czech RepublicSemiconductor superlattices are strongly nonlinear media offering several technological challenges associated with the generation of high-frequency Gigahertz radiation and very effective frequency multiplication up to several Terahertzs. However, charge accumulation, traps and interface defects lead to pronounced asymmetries in the nonlinear current flow, from which high harmonic generation stems. This problem requires a full non-perturbative solution of asymmetric current flow under irradiation, which we deliver in this paper within the Boltzmann-Bloch approach. We investigate the nonlinear output on both frequency and time domains and demonstrate a significant enhancement of even harmonics by tuning the interface quality. Moreover, we find that increasing arbitrarily the input power is not a solution for high nonlinear output, in contrast with materials described by conventional susceptibilities. There is a complex combination of asymmetry and power values leading to maximum high harmonic generation.https://doi.org/10.1515/nanoph-2020-0155asymmetric current flowhigh harmonic generationinterfacessemiconductor superlattices
collection DOAJ
language English
format Article
sources DOAJ
author Apostolakis Apostolos
Pereira Mauro F.
spellingShingle Apostolakis Apostolos
Pereira Mauro F.
Superlattice nonlinearities for Gigahertz-Terahertz generation in harmonic multipliers
Nanophotonics
asymmetric current flow
high harmonic generation
interfaces
semiconductor superlattices
author_facet Apostolakis Apostolos
Pereira Mauro F.
author_sort Apostolakis Apostolos
title Superlattice nonlinearities for Gigahertz-Terahertz generation in harmonic multipliers
title_short Superlattice nonlinearities for Gigahertz-Terahertz generation in harmonic multipliers
title_full Superlattice nonlinearities for Gigahertz-Terahertz generation in harmonic multipliers
title_fullStr Superlattice nonlinearities for Gigahertz-Terahertz generation in harmonic multipliers
title_full_unstemmed Superlattice nonlinearities for Gigahertz-Terahertz generation in harmonic multipliers
title_sort superlattice nonlinearities for gigahertz-terahertz generation in harmonic multipliers
publisher De Gruyter
series Nanophotonics
issn 2192-8606
2192-8614
publishDate 2020-07-01
description Semiconductor superlattices are strongly nonlinear media offering several technological challenges associated with the generation of high-frequency Gigahertz radiation and very effective frequency multiplication up to several Terahertzs. However, charge accumulation, traps and interface defects lead to pronounced asymmetries in the nonlinear current flow, from which high harmonic generation stems. This problem requires a full non-perturbative solution of asymmetric current flow under irradiation, which we deliver in this paper within the Boltzmann-Bloch approach. We investigate the nonlinear output on both frequency and time domains and demonstrate a significant enhancement of even harmonics by tuning the interface quality. Moreover, we find that increasing arbitrarily the input power is not a solution for high nonlinear output, in contrast with materials described by conventional susceptibilities. There is a complex combination of asymmetry and power values leading to maximum high harmonic generation.
topic asymmetric current flow
high harmonic generation
interfaces
semiconductor superlattices
url https://doi.org/10.1515/nanoph-2020-0155
work_keys_str_mv AT apostolakisapostolos superlatticenonlinearitiesforgigahertzterahertzgenerationinharmonicmultipliers
AT pereiramaurof superlatticenonlinearitiesforgigahertzterahertzgenerationinharmonicmultipliers
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