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The effect of a semiconductor-metal interface on localized terahertz plasmons
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10.1063/1.3565247
/content/aip/journal/apl/98/11/10.1063/1.3565247
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/11/10.1063/1.3565247
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Figures

Image of FIG. 1.
FIG. 1.

(a) SEM image of a typical Cu particle having a native layer. Panel (b) depicts the Au coverage of a particle surface via AES, and corresponds to the same region shown in panel (c). In panel (b) the intensity is given by , where is the height of the Au spectral peak and is the background level. This removes the intensity variation that can be caused by morphology.

Image of FIG. 2.
FIG. 2.

(a) An illustration how the plasmonic THz electric field, , penetrates into the metallic particle and interacts with the and Au (top). The dotted and solid lines indicate the electric field inside and outside the particle, respectively, at an instant in time. The lower portion of (a) shows a schematic of the experimental setup, where THz radiation is transmitted through a random ensemble the aforementioned particles. Shown in (b) and (c) are the time-domain electric field and PSD of THz pulses transmitted through ensembles of Au-coated particles, respectively, with (solid), 5 nm (dotted), 10 nm (dashed), 20 nm (dashed-dotted), and 100 nm (short dashed). Shown in (d) are the PSD of THz pulses transmitted through ensembles of Pt-coated particles, with (solid), 5 nm (dotted), 10 nm (medium dash), 20 nm (dashed-dotted), 50 nm (long dash), and 100 nm (short dash).

Image of FIG. 3.
FIG. 3.

(a) The PSD of THz pulses transmitted through ensembles of particles coated on one side with 200 nm of Cu and a thin layer of Au of thickness (solid) and 5 nm (dotted). Panel (b) depicts the PSD of THz pulses transmitted through ensembles of particles that are annealed to form a 50 nm native oxide layer and coated on one side with a thin layer of Au of thickness (dashed) and 5 nm (dotted). A nonannealed sample with is also shown (solid). The amplitudes in (a) are not referenced to the amplitudes in panels (b). The slightly different spectral content for the sample in (a) and (b) is due to a slight variation in the spectral content of the incident THz radiation between experiments, which originates from routine optimization of the THz system.

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/content/aip/journal/apl/98/11/10.1063/1.3565247
2011-03-14
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The effect of a semiconductor-metal interface on localized terahertz plasmons
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/11/10.1063/1.3565247
10.1063/1.3565247
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