Journal
OPTICS LETTERS
Volume 37, Issue 7, Pages 1217-1219Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.37.001217
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Funding
- University Grants Committee (UGC) [SEG CUHK-01]
- CUHK [2050508]
- Royal Society
- Research Grants Council (RGC)
- EPSRC [EP/F001428/2, EP/F001428/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F001428/2, EP/F001428/1] Funding Source: researchfish
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A mid-infrared (mid-IR)-focusing subwavelength grating (SWG) coupler and suspended membrane waveguide (SMW) on a silicon-on-insulator wafer are studied. For a transverse-electric mode uniform SWG, finite-difference time-domain simulation predicts 44.2% coupling efficiency with 1 dB bandwidth of about 220 nm and backreflection of 0.78% at 2.75 mu m. Then the uniform SWG is curved to a focusing SWG using a phase-matching formula. The SMWs are analyzed by the finite element method and fabricated. An Er3(+)-Pr3(+) co-doped mid-IR fiber laser is used for device characterization. The fabricated mid-IR SWG coupler has 24.7% coupling efficiency. (C) 2012 Optical Society of America
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