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Aspheric silicon lenses for terahertz photoconductive antennas
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10.1063/1.3072357
/content/aip/journal/apl/94/2/10.1063/1.3072357
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/2/10.1063/1.3072357
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic view of half of a focusing silicon lens. Rays at maximum emission angles corresponding to the total internal reflection limit are traced.

Image of FIG. 2.
FIG. 2.

Normalized illuminance profiles at the focal plane, centered around the optical axis, obtained by ray-tracing simulations.

Image of FIG. 3.
FIG. 3.

(a) Time-domain spectra recorded using the spherical and aspheric focusing lenses. (b) Corresponding amplitude spectra obtained after Fourier transform.

Image of FIG. 4.
FIG. 4.

Experimentally determined terahertz beam diameter at discrete frequencies from 0.2 to 1.5 THz for the spherical and aspheric lenses. Inset: amplitude profiles.

Image of FIG. 5.
FIG. 5.

Amplitude profiles at the focal plane measured experimentally and compared with Fresnel–Kirchhoff diffraction theory.

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/content/aip/journal/apl/94/2/10.1063/1.3072357
2009-01-14
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Aspheric silicon lenses for terahertz photoconductive antennas
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/2/10.1063/1.3072357
10.1063/1.3072357
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