Increase of group delay and nonlinear effects with hole shape in subwavelength hole arrays

Details Increase of group delay and nonlinear effects with hole shape in subwavelength hole arrays Increase of group delay and nonlinear effects with hole shape in subwavelength hole arrays

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010njph...12a3005p&link_type=abstract

New Journal of Physics, Volume 12, Issue 1, pp. 013005 (2010).

Physics

1

Scientific paper

We investigate the influence of hole shape on the group delay of femtosecond laser pulses propagating through arrays of rectangular subwavelength holes in metal films. We find a pronounced dependence of the group delay on the aspect ratio of the holes in the arrays. The maximum group delay occurs near the cut-off frequency of the holes. These experimental results are found to be in good agreement with calculations. The slow propagation of light through the array gives rise to enhancement of the second harmonic generated in the structures. The observed behavior is consistent with the presence of a resonance at the cut-off frequency of the rectangular holes.

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