Journal
OPTICS EXPRESS
Volume 25, Issue 17, Pages 19894-19903Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.019894
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Funding
- National Natural Science Foundation of China [60907003, 61671455]
- Foundation of NUDT [JC13-02-13]
- Hunan Provincial Natural Science Foundation of China [13JJ3001]
- Program for New Century Excellent Talents in University [NCET-12-0142]
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A new structure is reported, which realizes the flat focusing by introducing the silicon subwavelength slits into the waveguide. The subwavelength silicon-air slits, with variable widths to match the phase compensation, makes possible to focus a plane wave. The flat lens proposed here demonstrates relatively high power gain at the focal point or two focal points. By using such a design, we demonstrate a grating coupler with an ultrashort taper of 22.5-mu m to connect a 10-mu m-wide input waveguide and a 0.5-mu m-wide output waveguide, achieving a transmission up to nearly 95.4% numerically in the communication band. The length of which is one-twentieth of that for the traditional taper. To our best knowledge, this work is the first demonstration of an ultrashort taper based on flat lens, which significantly improves the integration of the photonics integrated circuits, and indicates an effective solution for potential applications in compactly integrated micro/nano optical devices. (C) 2017 Optical Society of America
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