Periodic nanostructure array in crossed holographic gratings on silica glass by two interfered infrared-femtosecond laser pulses

Kawamura, Ken-ichi; Sarukura, Nobuhiko; Hirano, Masahiro; Ito, Naoko; Hosono, Hideo
August 2001
Applied Physics Letters;8/27/2001, Vol. 79 Issue 9, p1228
Academic Journal
Two cross-superposed holographic gratings were encoded on silica glass by femtosecond laser pulses (wavelength ∼800 nm). A variety of periodic nanostructures from a one-dimensional wire array to two-dimensional arrays of holes or islands were formed by changing the energy density and the incidence angle of the irradiation laser beams. The smallest dimensions were a width of ∼15 nm for wires and a diameter of ∼20 nm for holes. Laser-driven microexplosions occurring within the microcylindrical-lens array created by the first laser pulse are suggested as a mechanism for the formation of these structures. Only two pulses are required to encode these periodic structures, which are applicable to emerging nanostructured devices such as photonic crystals and quantum dot or wire arrays. © 2001 American Institute of Physics.


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