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Efficient broadband energy transfer via momentum matching at hybrid junctions of guided-waves

2012; American Institute of Physics; Volume: 101; Issue: 12 Linguagem: Inglês

10.1063/1.4753985

1520-8842

Charles Lin, Herman M. K. Wong, Benedict Lau, Mohamed A. Swillam, Amr S. Helmy,

Optical Coatings and Gratings

Momentum matching at hybrid junctions is examined for efficient broadband energy transfer between internal reflection guided waves and evanescence-based plasmonic-gap guided waves. We demonstrate a nanoscale orthogonal junction coupler between 50 nm air-filled plasmonic slot waveguides (PSWs) and 450 nm silicon rib waveguides. Non-resonant junction coupling efficiency of 50 ± 2 % between 1450 nm and 1650 nm is achieved experimentally and PSW propagation loss is directly measured to be only 2.5 dB/μm. This taperless hybrid junction reduces PSW-based device footprint and enhances device tolerance to temperature and fabrication process variations, serving as a potential platform for hybrid silicon-plasmonic interconnects.