All-dielectric meta-lens designed for photoconductive terahertz antennas

作者：Yu Qing; Gu Jianqiang^*; Yang Quanlong; Zhang Ying; Li Yanfeng; Tian Zhen; Ouyang Chunmei; Han Jiaguang; O'hara John F; Zhang Weili

来源：IEEE Photonics Journal, 2017, 9(4): 7967651.

DOI：10.1109/JPHOT.2017.2721503

• Collimated beams
• Detector module
• Parabolic mirrors
• Photoconductive terahertz antennas
• Response characteristic
• Terahertz antennas
• Terahertz radiation
• Terahertz time domain spectroscopy

We present an all-dielectric meta-lens designed to collimate terahertz waves emitted from a terahertz antenna. The meta-lens is not only thinner than a conventional bulk silicon lens, but also promises to eliminate the use of parabolic mirrors in a terahertz time-domain spectroscopy system. A systematic numerical study reveals that the meta-lens exhibits excellent performance in both the emitter and detector modules, converting between the spherical wave of the antennas and the collimated beam. The frequency and alignment dependences of the meta-lens are also investigated to comprehensively map its response characteristics. The all-dielectric meta-lens presented here may pave a way in developing high-performance integrated photoconductive terahertz antenna components.

• 出版日期2017
• 单位天津大学