Optically reconfigurable polarized emission in Germanium

Abstract Light polarization can conveniently encode information. Yet, the ability to tailor polarized optical fields is notably demanding but crucial to develop practical methods for data encryption and to gather fundamental insights into light-matter interactions. Here we demonstrate the dynamic ma...

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Autores principales:	Sebastiano De Cesari, Roberto Bergamaschini, Elisa Vitiello, Anna Giorgioni, Fabio Pezzoli
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e4ce0cf8b9174c21b76c574fe5cf524f
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spelling	oai:doaj.org-article:e4ce0cf8b9174c21b76c574fe5cf524f2021-12-02T15:08:38ZOptically reconfigurable polarized emission in Germanium10.1038/s41598-018-29409-32045-2322https://doaj.org/article/e4ce0cf8b9174c21b76c574fe5cf524f2018-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-29409-3https://doaj.org/toc/2045-2322Abstract Light polarization can conveniently encode information. Yet, the ability to tailor polarized optical fields is notably demanding but crucial to develop practical methods for data encryption and to gather fundamental insights into light-matter interactions. Here we demonstrate the dynamic manipulation of the chirality of light at telecom wavelengths. This unique possibility is enrooted in the multivalley nature of the conduction band of a conventional semiconductor, namely Ge. In particular, we demonstrate that optical pumping suffices to govern the kinetics of spin-polarized carriers and eventually the chirality of the radiative recombination. We found that the polarized component of the emission can be remarkably swept through orthogonal eigenstates without magnetic field control or phase shifter coupling. Our results provide insights into spin-dependent phenomena and offer guiding information for the future selection and design of spin-enhanced photonic functionalities of group IV semiconductors.Sebastiano De CesariRoberto BergamaschiniElisa VitielloAnna GiorgioniFabio PezzoliNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-8 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Sebastiano De Cesari Roberto Bergamaschini Elisa Vitiello Anna Giorgioni Fabio Pezzoli Optically reconfigurable polarized emission in Germanium
description	Abstract Light polarization can conveniently encode information. Yet, the ability to tailor polarized optical fields is notably demanding but crucial to develop practical methods for data encryption and to gather fundamental insights into light-matter interactions. Here we demonstrate the dynamic manipulation of the chirality of light at telecom wavelengths. This unique possibility is enrooted in the multivalley nature of the conduction band of a conventional semiconductor, namely Ge. In particular, we demonstrate that optical pumping suffices to govern the kinetics of spin-polarized carriers and eventually the chirality of the radiative recombination. We found that the polarized component of the emission can be remarkably swept through orthogonal eigenstates without magnetic field control or phase shifter coupling. Our results provide insights into spin-dependent phenomena and offer guiding information for the future selection and design of spin-enhanced photonic functionalities of group IV semiconductors.
format	article
author	Sebastiano De Cesari Roberto Bergamaschini Elisa Vitiello Anna Giorgioni Fabio Pezzoli
author_facet	Sebastiano De Cesari Roberto Bergamaschini Elisa Vitiello Anna Giorgioni Fabio Pezzoli
author_sort	Sebastiano De Cesari
title	Optically reconfigurable polarized emission in Germanium
title_short	Optically reconfigurable polarized emission in Germanium
title_full	Optically reconfigurable polarized emission in Germanium
title_fullStr	Optically reconfigurable polarized emission in Germanium
title_full_unstemmed	Optically reconfigurable polarized emission in Germanium
title_sort	optically reconfigurable polarized emission in germanium
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/e4ce0cf8b9174c21b76c574fe5cf524f
work_keys_str_mv	AT sebastianodecesari opticallyreconfigurablepolarizedemissioningermanium AT robertobergamaschini opticallyreconfigurablepolarizedemissioningermanium AT elisavitiello opticallyreconfigurablepolarizedemissioningermanium AT annagiorgioni opticallyreconfigurablepolarizedemissioningermanium AT fabiopezzoli opticallyreconfigurablepolarizedemissioningermanium
_version_	1718388095514050560

Optically reconfigurable polarized emission in Germanium

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