Wei-Fan LI, Feng QI, Ye-Long WANG, Peng-Xiang LIU, Zhao-Yang LIU. Focal shift effect of terahertz wide-aperture refractive lens[J]. Journal of Infrared and Millimeter Waves, 2023, 42(3): 345
- Journal of Infrared and Millimeter Waves
- Vol. 42, Issue 3, 345 (2023)
Fig. 1. The schematic of THz beam focusing and focal shift effect
Fig. 2. Theoretical calculations of focal shift effect （a）intensity distributions along the optical axis at different Fresnel numbers，（b）relative focal shift and peak intensity with Fresnel number
Fig. 3. Focal shift analysis of the THz WARL with a 20 mm aperture and focal length （a）to （c）FEA simulations at 0.1，0.3，and 0.5 THz，respectively，（d）intensity distributions along the optical axis，（e）relative focal shift and peak intensity with working frequency and Fresnel number
Fig. 4. FEA simulation results obtained using different lens apertures，focal lengths，and working frequencies
Fig. 5. FEA simulations at 0.1 THz of the THz WARL with a 20 mm aperture and focal length，（a）without and （b）with focal shift compensation
Fig. 6. Focal shift （
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Table 1. Commercial THz WARLs with plano-convex surfaces
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