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Schematic view of half of a focusing silicon lens. Rays at maximum emission angles corresponding to the total internal reflection limit are traced.
Normalized illuminance profiles at the focal plane, centered around the optical axis, obtained by ray-tracing simulations.
(a) Time-domain spectra recorded using the spherical and aspheric focusing lenses. (b) Corresponding amplitude spectra obtained after Fourier transform.
Experimentally determined terahertz beam diameter at discrete frequencies from 0.2 to 1.5 THz for the spherical and aspheric lenses. Inset: amplitude profiles.
Amplitude profiles at the focal plane measured experimentally and compared with Fresnel–Kirchhoff diffraction theory.
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