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Characteristics of terahertz pulses from antireflective GaAs surfaces with nanopillars
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10.1063/1.4807407
/content/aip/journal/jap/113/20/10.1063/1.4807407
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/20/10.1063/1.4807407

Figures

Image of FIG. 1.
FIG. 1.

Schematic of THz pulse generation from nanopillars on a GaAs surface.

Image of FIG. 2.
FIG. 2.

Cross-sectional SEM images of nanopillars on GaAs surfaces. The inserted numbers denote sample indices. Samples were numbered in order of nanopillar density. The insets show oblique SEM images (tilted by 30°).

Image of FIG. 3.
FIG. 3.

(a) Time-domain waveforms of transmitted THz pulses and (b) reflection spectra around 790 nm of six samples and bare GaAs.

Image of FIG. 4.
FIG. 4.

(a) Measured time-domain waveforms of THz pulses from six samples and bare GaAs and (b) their spectral amplitudes. The inset in (b) shows spectral amplitudes normalized to the peak amplitudes.

Image of FIG. 5.
FIG. 5.

Temporal FWHMs ( ) and integrals of spectral amplitudes over all frequencies () of six samples and bare GaAs.

Image of FIG. 6.
FIG. 6.

Laser coupling efficiency ( ) and internal conversion efficiency ( ) of six samples. Values were normalized to those for bare GaAs. Solid (open) circles denote normalized .

Image of FIG. 7.
FIG. 7.

Measured time-domain waveforms of THz pulses from (a) bare GaAs and (b) sample , and (c) of the THz pulses when the power of the incident laser pulse is 50, 100, 150, 200, and 250 mW.

Tables

Generic image for table
Table I.

Summary of peak-to-peak (p-p) values, temporal and spectral FWHMs, and peak frequencies of THz pulses from six samples and bare GaAs.

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/content/aip/journal/jap/113/20/10.1063/1.4807407
2013-05-23
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Characteristics of terahertz pulses from antireflective GaAs surfaces with nanopillars
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/20/10.1063/1.4807407
10.1063/1.4807407
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