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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 16 — Jun. 1, 2011
  • pp: 2349–2355

Self-organized 2D periodic arrays of nanostructures in silicon by nanosecond laser irradiation

Barada K. Nayak, Keye Sun, Christian Rothenbach, and Mool C. Gupta  »View Author Affiliations


Applied Optics, Vol. 50, Issue 16, pp. 2349-2355 (2011)
http://dx.doi.org/10.1364/AO.50.002349


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Abstract

We report a phenomenon of spontaneous formation of self-organized 2D periodic arrays of nanostructures (protrusions) by directly exposing a silicon surface to multiple nanosecond laser pulses. These self- organized 2D periodic nanostructures are produced toward the edge as an annular region around the circular laser spot. The heights of these nanostructures are around 500 nm with tip diameter ~ 100 nm . The period of the nanostructures is about 1064 nm , the wavelength of the incident radiation. In the central region of the laser spot, nanostructures are destroyed because of the higher laser intensity (due to the Gaussian shape of the laser beam) and accumulation of large number of laser pulses. Optical diffraction from these nanostructures indicates a threefold symmetry, which is in accordance with the observed morphological symmetries of these nanostructures.

© 2011 Optical Society of America

OCIS Codes
(040.6040) Detectors : Silicon
(140.0140) Lasers and laser optics : Lasers and laser optics
(350.3390) Other areas of optics : Laser materials processing
(220.4241) Optical design and fabrication : Nanostructure fabrication
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Optical Design and Fabrication

History
Original Manuscript: December 13, 2010
Revised Manuscript: March 30, 2011
Manuscript Accepted: March 30, 2011
Published: May 20, 2011

Virtual Issues
May 27, 2011 Spotlight on Optics

Citation
Barada K. Nayak, Keye Sun, Christian Rothenbach, and Mool C. Gupta, "Self-organized 2D periodic arrays of nanostructures in silicon by nanosecond laser irradiation," Appl. Opt. 50, 2349-2355 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-16-2349


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