High efficiency geometric-phase polarization fan-out grating on silicon

作者：Wan, Chenhao; Lombardo, David; Sarangan, Andrew; Zhan, Qiwen^*

来源：Optics Express, 2017, 25(20): 24559-24565.

DOI：10.1364/OE.25.024559

• COUPLED-WAVE ANALYSIS
• PATH-LENGTH SENSITIVITY
• ARRAY GENERATION
• HOLOGRAMS
• DESIGN
• IMPLEMENTATION
• SUPERPOSITION
• DIFFRACTION
• FABRICATION
• LASERS

We report the design, fabrication and characterization of a 1-by-5 geometric-phase polarization fan-out grating for coherent beam combining at 1550 nm. The phase profile of the grating is accurately controlled by the local orientation of the binary subwavelength structure instead of the etching depth and profile empowering the grating to be more tolerant to fabrication errors. Deep-UV interference lithography on silicon offers an inexpensive, highly efficient and high damage threshold solution to fabricating large-area fan-out gratings than electron beam lithography (EBL) and photoalignment liquid crystals. The theoretical and experimental diffraction efficiency of the grating is 87% and 85.7% respectively. Such a fanout grating may find application to high-power beam combining in the infrared regime.

• 出版日期2017-10-2
• 单位华中科技大学