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Title: Surface nanostructuring by bichromatic femtosecond laser pulses through a colloidal particle array

This paper considers the surface nanostructuring of polymers and glasses by femtosecond laser pulses using an array of colloidal particles as a focusing system. We demonstrate that partial conversion of the femtosecond laser pulse energy into the second harmonic considerably reduces the surface modification threshold and the size of the resulting structural elements. At intensities above 10{sup 12} W cm{sup -2}, surface modification (ablation and swelling) occurs through free carrier generation. In this process, the second harmonic is more efficient in multiphoton ionisation, whereas the fundamental is more efficient in impact ionisation. The second harmonic is better focused by colloidal particle arrays than is the fundamental. As a result, the use of bichromatic pulses ensures a decrease in both the surface modification threshold and the size of the resulting structural elements. We discuss the optical properties of colloidal particle arrays and the ways of producing such arrays on dielectric substrates. (extreme light fields and their applications)
Authors:
; ; ; ; ; ;  [1] ;  [2]
  1. Institute of Applied Physics, Russian Academy of Sciences, Nizhnii Novgorod (Russian Federation)
  2. N.I. Lobachevsky Nizhnii Novgorod State University, Nizhnii Novgorod (Russian Federation)
Publication Date:
OSTI Identifier:
22395860
Resource Type:
Journal Article
Resource Relation:
Journal Name: Quantum Electronics (Woodbury, N.Y.); Journal Volume: 44; Journal Issue: 6; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABLATION; DIELECTRIC MATERIALS; ELEMENTARY PARTICLES; IONIZATION; LASERS; MULTI-PHOTON PROCESSES; NANOSTRUCTURES; OPTICAL PROPERTIES; POLYMERS; PULSES; SURFACES; SWELLING