Journal
OPTICS EXPRESS
Volume 18, Issue 19, Pages 20251-20262Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.020251
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We report on the experimental demonstration and analysis of a new waveguide principle using subwavelength gratings. Unlike other periodic waveguides such as line-defects in a 2D photonic crystal lattice, a subwavelength grating waveguide confines the light as a conventional index-guided structure and does not exhibit optically resonant behaviour. Subwavelength grating waveguides in silicon-on-insulator are fabricated with a single etch step and allow for flexible control of the effective refractive index of the waveguide core simply by lithographic patterning. Experimental measurements indicate a propagation loss as low as 2.1 dB/cm for subwavelength grating waveguides with negligible polarization and wavelength dependent loss, which compares favourably to conventional microphotonic silicon waveguides. The measured group index is nearly constant n(g) similar to 1.5 over a wavelength range exceeding the telecom C-band. (C) 2010 Optical Society of America
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