Wichmann Matthias, Scherger Benedikt, Schumann Steffen, Lippert Sina, Scheller Maik, Busch Stefan F, Jansen Christian, Koch Martin
Fachbereich Physik, Philipps-Universität Marburg, Marburg, Germany.
Opt Express. 2011 Dec 5;19(25):25151-60. doi: 10.1364/OE.19.025151.
Typical lenses suffer from Fresnel reflections at their surfaces, reducing the transmitted power and leading to interference phenomena. While antireflection coatings can efficiently suppress these reflections for a small frequency window, broadband antireflection coatings remain challenging. In this paper, we report on the simulation and experimental investigation of Brewster lenses in the THz-range. These lenses can be operated under the Brewster angle, ensuring reflection-free transmission of p-polarized light in an extremely broad spectral range. Experimental proof of the excellent focusing capabilities of the Brewster lenses is given by frequency and spatially resolved focus plane measurements using a fiber-coupled THz-TDS system.
典型的透镜在其表面会受到菲涅耳反射的影响，降低传输功率并导致干涉现象。虽然抗反射涂层可以在小频率窗口内有效抑制这些反射，但宽带抗反射涂层仍然具有挑战性。在本文中，我们报告了太赫兹波段布鲁斯特透镜的模拟和实验研究。这些透镜可以在布鲁斯特角下工作，确保在极宽的光谱范围内实现p偏振光的无反射传输。使用光纤耦合太赫兹时域光谱系统进行的频率和空间分辨焦平面测量给出了布鲁斯特透镜出色聚焦能力的实验证明。
