This letter reports proof-of-principle demonstration of 3-D printable, low-cost, and compact terahertz (THz) spectral splitters based on diffractive optical elements (DOEs) designed to disperse incident collimated broadband THz radiation (0.5-0.7 THz) at a prespecified distance. Via inverse design, we show that it is possible to design a diffractive optic that can split broadband incident spectrum in any desired fashion, as is evidenced from both finite-difference time domain (FDTD) simulations and measured intensity profiles using a 500-750-GHz vector network analyzer (VNA). Due to its straightforward as well as simple construction without the usage of movable parts, our approach, in principle, can have various applications such as in portable, low-cost spectroscopy as well as in wireless THz communication systems as a THz demultiplexer.

中文翻译：

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逆向设计的太赫兹光谱分离器


这封信报告了基于衍射光学元件 (DOE) 的可 3D 打印、低成本、紧凑型太赫兹 (THz) 光谱分离器的原理验证演示，该分离器设计用于在 100°C 色散入射准直宽带太赫兹辐射 (0.5-0.7 THz)。预定的距离。通过逆向设计，我们表明可以设计一种衍射光学器件，以任何所需的方式分割宽带入射光谱，有限差分时域 (FDTD) 模拟和使用 500-750-500-750 的测量强度分布都证明了这一点。 GHz 矢量网络分析仪 (VNA)。由于其结构简单且无需使用可移动部件，因此我们的方法原则上可以具有多种应用，例如便携式、低成本光谱学以及作为太赫兹解复用器的无线太赫兹通信系统。