In this work, we show the possibility of combining grating couplers and mode converters, both with a high efficiency. The proposed devices are very compact with no extra fabrication efforts required. We have shown that the LP01, LP11a, LP11b and LP21b modes in an optical fiber can be successfully excited directly from the proposed grating couplers, which have the fundamental mode as an input from an integrated waveguide. It is shown the overall efficiency could be as high as 50%.
Meng Zhang, Henan Liu, Guifang Li , and Lin Zhang, "Highly efficient grating couplers with mode conversion functions," Proc. SPIE 10535, Integrated Optics: Devices, Materials, and Technologies XXII, 105351P (Presented at SPIE OPTO: February 01, 2018; Published: 23 February 2018); https://doi.org/10.1117/12.2291342.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon