dorsal/arxiv
View SchemaReflection of a few-cycle laser pulse on a metal nano-layer: generation of phase-dependent wake-fields
| Authors | Sandor Varro |
|---|---|
| Categories | |
| ArXiv ID | physics/0610229 |
| URL | https://arxiv.org/abs/physics/0610229 |
| DOI | 10.1002/lapl.200610095 |
| Journal | Laser Physics Letters, Vol. 4, pp 138-144 (2007) |
Abstract
The reflection and transmission of a few-cycle femtosecond Ti:Sa laser pulse impinging on a metal nano-layer have been analysed. The thickness of the layer was assumed to be of order of 2-10 nm, and the metallic free electrons were represented by a surface current density distributed at the plane boundary of a dielectric substrate. The target studied this way can be imagined, for instance, as a semi-transparent mirror produced by evapotating a thin aluminum layer on the surface of a glass plate. The exact analytic solution has been given for the system of the coupled Maxwell-Lorentz equations decribing the dynamics of the surface current and the scattered radiation fields. It has been shown that in general a non-oscillatoty frozen-in wake-field appears following the main pulse with an exponential decay and with a definite sign of the electric field. The characteristic time of these wake-fields is inversely proportional with the square of the plasma frequency and with the thickness of the metal nano-layer, and can be larger than the original pulse duration. The magnitude of these wake-fields is proportional with the incoming field strength, and the definite sign of them governed by the cosine of the carrier-envelope phase difference of the incoming ultrashort laser pulse. As a consequence, when we let such a wake-field excite the electrons of a secondary target (say an electron beam, a metal plate or a gas jet), we obtain 100 percent modulation in the electron signal in a given direction, as we vary the carrier-envelope phase difference. This scheeme can perhaps serve as a basis for the construction of a robust linear carrier-envelope phase difference meter.
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"abstract": "The reflection and transmission of a few-cycle femtosecond Ti:Sa laser pulse\nimpinging on a metal nano-layer have been analysed. The thickness of the layer\nwas assumed to be of order of 2-10 nm, and the metallic free electrons were\nrepresented by a surface current density distributed at the plane boundary of a\ndielectric substrate. The target studied this way can be imagined, for\ninstance, as a semi-transparent mirror produced by evapotating a thin aluminum\nlayer on the surface of a glass plate. The exact analytic solution has been\ngiven for the system of the coupled Maxwell-Lorentz equations decribing the\ndynamics of the surface current and the scattered radiation fields. It has been\nshown that in general a non-oscillatoty frozen-in wake-field appears following\nthe main pulse with an exponential decay and with a definite sign of the\nelectric field. The characteristic time of these wake-fields is inversely\nproportional with the square of the plasma frequency and with the thickness of\nthe metal nano-layer, and can be larger than the original pulse duration. The\nmagnitude of these wake-fields is proportional with the incoming field\nstrength, and the definite sign of them governed by the cosine of the\ncarrier-envelope phase difference of the incoming ultrashort laser pulse. As a\nconsequence, when we let such a wake-field excite the electrons of a secondary\ntarget (say an electron beam, a metal plate or a gas jet), we obtain 100\npercent modulation in the electron signal in a given direction, as we vary the\ncarrier-envelope phase difference. This scheeme can perhaps serve as a basis\nfor the construction of a robust linear carrier-envelope phase difference\nmeter.",
"arxiv_id": "physics/0610229",
"authors": [
"Sandor Varro"
],
"categories": [
"physics.plasm-ph"
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"doi": "10.1002/lapl.200610095",
"journal_ref": "Laser Physics Letters, Vol. 4, pp 138-144 (2007)",
"title": "Reflection of a few-cycle laser pulse on a metal nano-layer: generation of phase-dependent wake-fields",
"url": "https://arxiv.org/abs/physics/0610229"
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