Design and characterization of telecentric f-θ scanning lenses for broadband terahertz frequency systems.
Design and characterization of telecentric f-θ scanning lenses for broadband terahertz frequency systems.
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DOI:
10.1063/5.0030110
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发表时间:
2020-12
期刊:
影响因子:
1.6
通讯作者:
Arbab MH
中科院分区:
文献类型:
--
作者:
Harris ZB;Katletz S;Khani ME;Virk A;Arbab MH
Telecentric beam scanning using f-θ lenses offers nearly uniform spot size, linear beam displacement, and normal incidence angle over a planar surface. These unique properties allow for the minimization of imaging distortion over a wide field-of-view. In this article, we present a numerical method for designing custom f-θ lenses in the THz regime. We fabricated three lenses made from different commonly used polymer materials in the THz optics. We demonstrated their optical performance metrics compared to a conventional plano-convex lens over the broadband 0.3 THz–1 THz range. We find that the f-θ lens designed using the optical properties of high-density polyethylene achieved superior performance by maintaining a constant phase over a wide field of view of about 34°. We demonstrate this isophase property by measuring a constant time of arrival of the THz time-domain pulses over a reference mirror with a standard deviation of ∼19 fs, in excellent agreement with simulation predictions. This work will pave the way for the design and implementation of highly precise and fast telecentric imaging systems in the THz frequencies.
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