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Coherent terahertz detection with a large-area photoconductive antenna
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) Time domain terahertz wave form detected with electro-optical sensing (dotted line). The solid line shows the first derivative in time of the measured photocurrent. The spot diameter on the PC detector was . The inset of (a) shows the calculated amplitude spectra. (b) shows a comparison between electro-optical signal (exp) and modeled using different carrier lifetimes of the detector material .

Image of FIG. 2.
FIG. 2.

Measured terahertz signal for different excitation densities at the photoconductive detector. The inset shows the linear behavior for low excitation densities. The solid line is the linear extrapolation from the low excitation densities.

Image of FIG. 3.
FIG. 3.

Terahertz signal vs spot diameter of the gating beam at a fixed power of on the detector. The black squares are the measured data, while the solid curve is a semiempirical calculation accounting for the nonlinear dependence between excitation density and terahertz signal (Fig 2). The inset shows the experimental configuration.

Image of FIG. 4.
FIG. 4.

(a) Measured terahertz profile. (b) Beam divergences resolved for several frequency components. Solid lines are Gaussian fits to the measured data.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Coherent terahertz detection with a large-area photoconductive antenna