Journal
OPTICS LETTERS
Volume 35, Issue 19, Pages 3243-3245Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.35.003243
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Funding
- National Research Council of Canada (NRC) Genomics and Health Initiative
- Spanish Ministerio de Ciencia e Innovacion [TEC2009-10152]
- FPU [AP-2006-03355]
- Andalusian Regional Ministry of Science, Innovation and Business [TIC-02946]
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We demonstrate a fully etched, continuously apodized fiber-to-chip surface grating coupler for the first time (to our knowledge). The device is fabricated in a single-etch step and operates with TM-polarized light, achieving a coupling efficiency of 3.7 dB and a 3 dB bandwidth of 60 nm. A subwavelength microstructure is employed to generate an effective medium engineered to vary the strength of the grating and thereby maximize coupling efficiency, while mitigating backreflections at the same time. Minimum feature size is 100 nm for compatibility with deep-UV 193 nm lithography. (C) 2010 Optical Society of America
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