Terahertz radiation generation from metallic electronic structure manipulated by inhomogeneous DC-fields

Abstract We propose a feasible, high-efficiency scheme of primary terahertz (THz) radiation source through manipulating electronic structure (ES) of a metallic film by targeted-designed DC-fields configuration. The DC magnetic field is designed to be of a spatially inhomogeneous strength profile, an...

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Autores principales:	H. Lin, C. P. Liu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/395d6c0d5ede4480bff6c4dfd4b42802
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spelling	oai:doaj.org-article:395d6c0d5ede4480bff6c4dfd4b428022021-12-02T16:35:55ZTerahertz radiation generation from metallic electronic structure manipulated by inhomogeneous DC-fields10.1038/s41598-021-85619-22045-2322https://doaj.org/article/395d6c0d5ede4480bff6c4dfd4b428022021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-85619-2https://doaj.org/toc/2045-2322Abstract We propose a feasible, high-efficiency scheme of primary terahertz (THz) radiation source through manipulating electronic structure (ES) of a metallic film by targeted-designed DC-fields configuration. The DC magnetic field is designed to be of a spatially inhomogeneous strength profile, and its direction is designed to be normal to the film, and the direction of the DC electric field is parallel to the film. Strict quantum theory and numerical results indicate that the ES under such a field configuration will change from a 3D Fermi sphere into a highly-degenerate structure whose density-of-state curve has pseudogap near Fermi surface. Wavefunctions’ shapes in this new ES are space-asymmetric, and the width of pseudogap near Fermi surface, as well as magnitudes of transition matrix element, can be handily controlled by adjusting parameter values of DC fields. Under available parameter values, the width of the pseudogap can be at milli-electron-volt level (corresponding to THz radiation frequency), and the magnitude of oscillating dipole can be at $$10^{-9} C*m$$ 10 - 9 C ∗ m -level. In room-temperature environment, phonon in metal can pump the ES to achieve population inversion.H. LinC. P. LiuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-16 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q H. Lin C. P. Liu Terahertz radiation generation from metallic electronic structure manipulated by inhomogeneous DC-fields
description	Abstract We propose a feasible, high-efficiency scheme of primary terahertz (THz) radiation source through manipulating electronic structure (ES) of a metallic film by targeted-designed DC-fields configuration. The DC magnetic field is designed to be of a spatially inhomogeneous strength profile, and its direction is designed to be normal to the film, and the direction of the DC electric field is parallel to the film. Strict quantum theory and numerical results indicate that the ES under such a field configuration will change from a 3D Fermi sphere into a highly-degenerate structure whose density-of-state curve has pseudogap near Fermi surface. Wavefunctions’ shapes in this new ES are space-asymmetric, and the width of pseudogap near Fermi surface, as well as magnitudes of transition matrix element, can be handily controlled by adjusting parameter values of DC fields. Under available parameter values, the width of the pseudogap can be at milli-electron-volt level (corresponding to THz radiation frequency), and the magnitude of oscillating dipole can be at $$10^{-9} C*m$$ 10 - 9 C ∗ m -level. In room-temperature environment, phonon in metal can pump the ES to achieve population inversion.
format	article
author	H. Lin C. P. Liu
author_facet	H. Lin C. P. Liu
author_sort	H. Lin
title	Terahertz radiation generation from metallic electronic structure manipulated by inhomogeneous DC-fields
title_short	Terahertz radiation generation from metallic electronic structure manipulated by inhomogeneous DC-fields
title_full	Terahertz radiation generation from metallic electronic structure manipulated by inhomogeneous DC-fields
title_fullStr	Terahertz radiation generation from metallic electronic structure manipulated by inhomogeneous DC-fields
title_full_unstemmed	Terahertz radiation generation from metallic electronic structure manipulated by inhomogeneous DC-fields
title_sort	terahertz radiation generation from metallic electronic structure manipulated by inhomogeneous dc-fields
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/395d6c0d5ede4480bff6c4dfd4b42802
work_keys_str_mv	AT hlin terahertzradiationgenerationfrommetallicelectronicstructuremanipulatedbyinhomogeneousdcfields AT cpliu terahertzradiationgenerationfrommetallicelectronicstructuremanipulatedbyinhomogeneousdcfields
_version_	1718383684596269056

Terahertz radiation generation from metallic electronic structure manipulated by inhomogeneous DC-fields

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