An efficient and ultra-broadband unidirectional optical coupler for wide incidence angles

作者：Lu, Fan; Wang, Zhonghua^*; Tian, Zhixin; Xu, Anshi

来源：Optics Communications, 2016, 379: 1-5.

DOI：10.1016/j.optcom.2016.05.027

• Unidirectional optical coupling
• Subwavelength metallic gratings
• Metal-dielectric-metal waveguide

An efficient and unidirectional optical coupling scheme for metal-dielectric-metal (MDM) waveguides with wide-angle and ultra-broadband efficiency is proposed and demonstrated. Based on joint effects of the plasmonic critical angle phenomenon (PCA), the zero-order grating resonance, and the first-order Fabry Perot (FP) resonance of the MDM waveguide, the illuminated light could be efficiently coupled into MDM plasmonic waveguide with angular-full-width-half-maximum (AFWHM) widen to 50 over a broad wavelength range 750-1000 nm. The operation principle and performance of the structure are clarified and theoretically illustrated.

• 出版日期2016-11-15
• 单位北京大学; 北京空间飞行器总体设计部