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Title: Dramatic dwindling of the power spectrum of high order harmonics by shrinking of the gap size in bowtie nanostructures

Abstract

Our work is based on high harmonic generation in a gaseous medium (helium ion), by exploiting gold bowtie nanostructures as laser field amplifiers. As the result of emission of a laser pulse, the wave function of the atom varies with time; so, it is necessary to solve 1D time-dependent Schrödinger equation by means of split operator method. By illumination of a short duration, long wavelength three color laser pulse inside the gap, the enhanced field not only changes with time, but also varies in space. In this work we considered this space inhomogeneity in linear and nonlinear schemes. We show that in nonlinear case, the plateau region is more extended. We also show that in larger gaps, cutoff occurs on higher frequencies. But limitation of electron motion in bowtie nanostructures leads to the choice of an optimum 16 nm gap size in our case. We predict that, by the superposition of supercontinuum harmonics, a 26 attosecond pulse can be generated.

Authors:
;  [1];  [2]
  1. University of Guilan, Department of Faculty of Science (Iran, Islamic Republic of)
  2. Shahid Beheshti University, Laser and Plasma Research Institute (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22617056
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 124; Journal Issue: 3; Other Information: Copyright (c) 2017 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; AMPLIFIERS; ELECTRONS; EMISSION; GOLD; HARMONIC GENERATION; HARMONICS; HELIUM IONS; ILLUMINANCE; LASER RADIATION; NANOSTRUCTURES; PULSES; SCHROEDINGER EQUATION; SPECTRA; TIME DEPENDENCE; WAVE FUNCTIONS; WAVELENGTHS

Citation Formats

Hosseinzadeh, F., Batebi, S., E-mail: s-batebi@guilan.ac.ir, and Soofi, M. Q. Dramatic dwindling of the power spectrum of high order harmonics by shrinking of the gap size in bowtie nanostructures. United States: N. p., 2017. Web. doi:10.1134/S1063776117020121.
Hosseinzadeh, F., Batebi, S., E-mail: s-batebi@guilan.ac.ir, & Soofi, M. Q. Dramatic dwindling of the power spectrum of high order harmonics by shrinking of the gap size in bowtie nanostructures. United States. doi:10.1134/S1063776117020121.
Hosseinzadeh, F., Batebi, S., E-mail: s-batebi@guilan.ac.ir, and Soofi, M. Q. Wed . "Dramatic dwindling of the power spectrum of high order harmonics by shrinking of the gap size in bowtie nanostructures". United States. doi:10.1134/S1063776117020121.
@article{osti_22617056,
title = {Dramatic dwindling of the power spectrum of high order harmonics by shrinking of the gap size in bowtie nanostructures},
author = {Hosseinzadeh, F. and Batebi, S., E-mail: s-batebi@guilan.ac.ir and Soofi, M. Q.},
abstractNote = {Our work is based on high harmonic generation in a gaseous medium (helium ion), by exploiting gold bowtie nanostructures as laser field amplifiers. As the result of emission of a laser pulse, the wave function of the atom varies with time; so, it is necessary to solve 1D time-dependent Schrödinger equation by means of split operator method. By illumination of a short duration, long wavelength three color laser pulse inside the gap, the enhanced field not only changes with time, but also varies in space. In this work we considered this space inhomogeneity in linear and nonlinear schemes. We show that in nonlinear case, the plateau region is more extended. We also show that in larger gaps, cutoff occurs on higher frequencies. But limitation of electron motion in bowtie nanostructures leads to the choice of an optimum 16 nm gap size in our case. We predict that, by the superposition of supercontinuum harmonics, a 26 attosecond pulse can be generated.},
doi = {10.1134/S1063776117020121},
journal = {Journal of Experimental and Theoretical Physics},
number = 3,
volume = 124,
place = {United States},
year = {Wed Mar 15 00:00:00 EDT 2017},
month = {Wed Mar 15 00:00:00 EDT 2017}
}