Exploiting a metal wire grating in total internal reflection geometry to achieve achromatic polarisation conversion
Publication in refereed journal


引用次數
替代計量分析
.

其它資訊
摘要We demonstrate how a metal wire grating can work as a 45° polarization converter, a quarter-wave retarder, and a half-wave retarder over a broadband terahertz range when set up in total internal reflection geometry. Classical electromagnetic theory is applied to understand the mechanism, and equations to calculate the polarization state of reflected light are derived. We use a metal grating with a period of 20 μm and width of 10 μm on a fused silica surface: linearly polarized terahertz light incident from fused silica with a supercritical incident angle of 52° is totally reflected by the metal grating and air. The polarization of the terahertz light is rotated by 45°, 90°, and circularly polarized by simply rotating the wire grating. The performance is achromatic over the measured range of 0.1–0.7 THz and comparable to commercial visible light wave retarders.
著者Xudong Liu, Xuequan Chen, Edward P. J. Parrott, Emma Pickwell-MacPherson
期刊名稱Photonics Research
出版年份2017
月份6
日期14
卷號5
期次4
出版社Optical Society of America
出版地USA
頁次299 - 304
國際標準期刊號2327-9125
語言美式英語
關鍵詞Absorption coefficient, Circular polarization, Fused silica, Metal gratings, Refractive index, Total internal reflection

上次更新時間 2020-01-12 於 01:30