Journal
OPTICS EXPRESS
Volume 23, Issue 17, Pages 22628-22635Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.022628
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Funding
- Slovak Research and Development Agency (SRDA) [APVV-0025-12]
- National Research Council Canada
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Surface grating couplers are fundamental components in chip-based photonic devices to couple light between photonic integrated circuits and optical fibers. In this work, we report on a grating coupler with sub-decibel experimental coupling efficiency using a single etch process in a standard 220-nm silicon-on-insulator (SOI) platform. We specifically demonstrate a subwavelength metamaterial refractive index engineered nanostructure with backside metal reflector, with the measured peak fiber-chip coupling efficiency of -0.69 dB (85.3%) and 3 dB bandwidth of 60 nm. This is the highest coupling efficiency hitherto experimentally achieved for a surface grating coupler implemented in 220-nm SOI platform. (C) 2015 Optical Society of America
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