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Vibrational modes of GaAs hexagonal nanopillar arrays studied with ultrashort optical pulses
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10.1063/1.3696380
/content/aip/journal/apl/100/13/10.1063/1.3696380
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/13/10.1063/1.3696380

Figures

Image of FIG. 1.
FIG. 1.

Typical SEM images of the GaAs nanopillars. (a) Top view. (b) Oblique view.

Image of FIG. 2.
FIG. 2.

(a) Experimental setup. PBS: Polarizing beam splitter. (b) Measured relative reflectivity variation δR(t)/R. Inset: Background subtracted data. (c) Moduli of the temporal Fourier transforms for δR(t)/R (solid line) and forthe simulated displacements: Uz (dotted line) and Ux (dashed line), both normalized (the latter enhanced by a factor of 9). The bright horizontal line segment in the inset was used to average the Fourier transform moduli.

Image of FIG. 3.
FIG. 3.

(a) Simulated maps of the x- and z-directed motion from moduli of the temporal Fourier transforms. The sections are vertical cuts in the [1 −1 0] direction. (b) Sections of the mode deformations in anti-phase.

Image of FIG. 4.
FIG. 4.

The 7 simulated peak frequencies (a) vs. 1/a, with d and h fixed at the sample nominal values; (b) vs. 1/d for constant a and h; (c) vs. h for constant a and w. Arrows show nominal sample values. The dashed curves in (a) are fits, labelled by reciprocal lattice vector indices (i, j) (Ref. 6), based on an empty-lattice model. The dashed curves in (b) are guides to theeye.

Tables

Generic image for table
Table I.

Fitting parameters for the experimental δR(t)/R using a sum over five terms in the form Ai cos(2πfit + ψi )exp(− 2πfit/Qi ). (i)-(iv) refer to vibrations, whereas “Bulk” refers to the Brillouin peak whose Q-factor is determined by the optical penetration of probe beam.

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/content/aip/journal/apl/100/13/10.1063/1.3696380
2012-03-26
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Vibrational modes of GaAs hexagonal nanopillar arrays studied with ultrashort optical pulses
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/13/10.1063/1.3696380
10.1063/1.3696380
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