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11 August 2011Focalizing of terahertz waves with a Fresnel lens
The spatiotemporal and spectral characteristics of ultrawide-band terahertz pulses after passing through a Fresnel lens
are studied by using scalar diffraction theory. The simulation shows that the transmitted terahertz waveforms compress
with increasing propagation distance, and the multi-frequency focusing phenomenon at different focal points is
observed. Additionally, the distribution of terahertz fields in planes perpendicular to the axis is also discussed, and it is
found that the diffraction not only induces focusing on axis but also inhibit focusing at off-axis positions. Therefore,
the Fresnel lens may be a useful alternative approach to be a terahertz filter. Moreover, the terahertz pulses travelling as
basic mode of Gaussian beam is discussed in detail.
Yulei Shi,Wei Liu,Qing-li Zhou, andCunlin Zhang
"Focalizing of terahertz waves with a Fresnel lens", Proc. SPIE 8195, International Symposium on Photoelectronic Detection and Imaging 2011: Terahertz Wave Technologies and Applications, 819504 (11 August 2011); https://doi.org/10.1117/12.899428
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Yulei Shi, Wei Liu, Qing-li Zhou, Cunlin Zhang, "Focalizing of terahertz waves with a Fresnel lens," Proc. SPIE 8195, International Symposium on Photoelectronic Detection and Imaging 2011: Terahertz Wave Technologies and Applications, 819504 (11 August 2011); https://doi.org/10.1117/12.899428