Achromatic terahertz quarter-wave retarder in reflection mode

作者：Sun, L^*; Lu, Z; Zhang, D; Zhao, Z; Yuan, J

来源：Applied Physics B: Lasers and Optics , 2012, 106(2): 393-398.

DOI：10.1007/s00340-011-4723-9

A compact achromatic quarter-wave retarder (QWR) operating in reflection mode is designed for using in terahertz region. It is a composite device utilizing form birefringence and Fabry-P,rot (FP) interference. Under illumination of plane waves with incidence angle of 45A degrees, from 1.8 THz to 2.8 THz, the QWR achieved only +/- 2A degrees variation around 90A degrees phase retardation, enlarging the working bandwidth of ordinary QWR greatly. An analytical model combining transmission-line (TL) theory with effective medium theory (EMT) is presented and results agree well with the time-consuming numerical calculation. The 38 mu m thick construction is simple and easy for fabrication by the existing lithographic technique and a promising application in terahertz or other frequency region is believed.

• 出版日期2012-2
• 单位中国人民解放军国防科学技术大学