THz Fresnel Lenses

Beam control is necessary in many terahertz (THz) applications. It is currently achieved by means of parabolic mirrors and refractive optics. However, diffraction optics presents game-changing capabilities because it can be used for spatial transformation of the beam. To fulfill the need for diffraction optics operating in THz range, we have developed a method for calculation and manufacturing of THz Fresnel lenses.

Fig. 1. Monochromatic Fresnel lenses from various thermoplastic materials (COC, PLA, HIPS)

Fig. 2. Wideband Fresnel lens made of COC thermoplastic

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