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Effects of pump pulse propagation and spatial distribution of bias fields on terahertz generation from photoconductive antennas
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10.1063/1.4816561
/content/aip/journal/jap/114/4/10.1063/1.4816561
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/4/10.1063/1.4816561
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Cross-sectional view of the spatial profiles of the bias field for (a) large-aperture (∼1 cm) stripline antenna and (b) small-gap (∼10 m) dipole antenna. The negative values corresponding to positions inside the photoconductor. The nominal strength of is assumed to be about 2.0 kV cm. The arrows indicate the vectors, the (+) and (–) symbols denote positive and negative terminals located on the transmission line structures for the two types of antennas, respectively.

Image of FIG. 2.
FIG. 2.

Time evolutions of (a) a pump pulse , (b) carrier density , and effective absorption coefficient α at four different times:  = 0.5 ps (brown), 1.1 ps (green), 1.63 ps (blue), and 1.8 ps (red). The horizontal z-axis indicates positions along the direction of propagation of the pump pulse. The solid purple line indicates the interface of air (white region) and antenna (yellow region) at  = 0.5 mm. As shown in Fig. 1 , the magnitude of the bias field is significant only between the solid and dashed purple lines (∼7 m) for small-gap antennas.

Image of FIG. 3.
FIG. 3.

Radiated THz field from a large-aperture antenna. The vertical line at  = 0.5 mm indicates the interface of air and antenna. (a) Time evolution of the field at four different times  = 0.5, 1.1, 1.63, and 1.8 ps. (b) temporal waveforms of Near-field (blue line) and far-field (red line) fields.

Image of FIG. 4.
FIG. 4.

THz radiation generated from a small-gap antenna. (a) Time evolution of the field at four different times  = 0.5, 1.1, 1.63, and 1.8 ps. The yellow region denotes the antenna, the region of significant is located between the solid and dashed purple lines. (b) Temporal waveforms of the Near-field (blue line) and far-field (red line). In the simulation, the depth of non-zero bias field, , Δ = 7 m, the spatial extent of the pump pulse  = 40 m, the propagation speed of pump pulse in the photoconductor  = 8.3 × 10 m s, thus ≈ 0.08 ps and ≈ 0.48 ps.

Image of FIG. 5.
FIG. 5.

Dependences of the peak amplitude of THz pulses on the pump fluence for a large-aperture antenna The red rectangles correspond to calculations using  =  in Eq. (1) . The blue dots correspond to the case of (1−/ ) in Eq. (1) .

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/content/aip/journal/jap/114/4/10.1063/1.4816561
2013-07-26
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effects of pump pulse propagation and spatial distribution of bias fields on terahertz generation from photoconductive antennas
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/4/10.1063/1.4816561
10.1063/1.4816561
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