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  Subwavelength topological structures resulting from surface two-plasmon resonance by femtosecond laser exposure solid surface

Song, H.-Y., Liu, S.-B., Liu, H., Wang, Y., Chen, T., & Dong, X.-M. (2016). Subwavelength topological structures resulting from surface two-plasmon resonance by femtosecond laser exposure solid surface. Optics Express, 24(11), 12151-12165. doi:10.1364/OE.24.012151.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-F42D-B Version Permalink: http://hdl.handle.net/21.11116/0000-0001-F4C6-C
Genre: Journal Article

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oe-24-11-12151.pdf (Publisher version), 3MB
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2016
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http://dx.doi.org/10.1364/OE.24.012151 (Publisher version)
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 Creators:
Song, Hai-Ying1, Author
Liu, Shi-Bing1, Author
Liu, Haiyun2, Author              
Wang, Yang1, Author
Chen, Tao1, Author
Dong, Xiang-Ming1, Author
Affiliations:
1Strong-field and Ultrafast Photonics Lab, Institute of Laser Engineering Beijing University of Technology, Beijing 100124, China , ou_persistent22              
2Extreme Timescales, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938294              

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Free keywords: OCIS codes: (350.3390) Laser materials processing; (260.7120) Ultrafast phenomena; (310.6628) Subwavelength structures
 Abstract: We present that surface two-plasmon resonance (STPR) in electron plasma sheet produced by a femtosecond laser irradiating a solid surface is the self-formation mechanism of periodic subwavelength ripple structures. Peaks of overdense electrons, formed by resonant two-plasmon wave mode, pull bound ions out of the metal surface. Thus, the wave pattern of STPR is “carved” on the surface by Coulomb ablation (removal) due to periodic distributed strong electrostatic field produced by charge separation. To confirm the STPR model, we have performed analogical carving experiments by two femtosecond laser beams with perpendicular polarizations and time delay. The results explicitly show that two wave patterns of STPR generated by each beam are independently created in the pulse exposure area of a target surface, which is like the traditional “layer-carving” technique by comparison with the structured topological features. The time-scale of ablation dynamics and the electron temperature in ultrafast interaction are also verified by a time-resolved spectroscopy experiment and numerical simulation, respectively. The present model can self-consistently explain the formation of subwavelength ripple structures even with spatial periods shorter than half of the laser wavelength, shedding light on the understanding of ultrafast laser-solid interaction.

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Language(s): eng - English
 Dates: 2016-05-192015-12-182016-05-202016-05-262016-05-30
 Publication Status: Published in print
 Pages: 15
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1364/OE.24.012151
 Degree: -

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Title: Optics Express
  Abbreviation : Opt Express
Source Genre: Journal
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Publ. Info: Washington, DC : Optical Society of America
Pages: - Volume / Issue: 24 (11) Sequence Number: - Start / End Page: 12151 - 12165 Identifier: ISSN: 1094-4087
CoNE: /journals/resource/954925609918