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Schematic diagram of the THz pigtail.
The dotted line and open circles represent the experimentally obtained spectra (normalized values) of bare InAs emitter and the InAs emitter coupled to the TPX lens duct, respectively. The dashed line designates the transmittance of a thick TPX slab while the solid line denotes the numerically calculated spectrum of the emitter-lens duct assembly.
The experimentally obtained spectra (normalized values) of the lens duct and the THz pigtail with a waveguide are indicated by the open circles and the filled circles, respectively. The transmittance of Teflon is symbolized by the broken line while numerically determined spectrum of the THz pigtail with a waveguide is signified by the solid line.
THz radiation power as a function of length. This plot is divided into two regions; region I and region II . Region I is that of the lens duct while region II is that of the pigtail. The solid square in region I at the mark represents the THz radiation power from the lens duct itself as measured directly by the bolometer. In this region also, the open circles represents the calculated values of the THz radiation power from TPX with thicknesses of , , and , which are obtained based on the absorption coefficient of TPX. The loss due to coupling based on the calculated THz power from the TPX of various thicknesses is estimated to be .
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