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We review our advances in diffractive and subwavelength grating coupler structures for microphotonic waveguides. We present a subwavelength grating fiber-chip edge coupler with a loss as low as 0.9 dB and with minimal wavelength dependence over a broad wavelength range exceeding 200 nm. We also present fiber-to-chip surface grating couplers based on subwavelength effective medium. The effective medium...
Fibre-to-chip grating couplers are an efficient means for injecting and extracting light from silicon-wire waveguides. Here we present the design of single-etch couplers, based on effective media implemented with sub-wavelength gratings. We show that the pitch of these sub-wavelength structures can be increased to make their fabrication compatible with deep-ultraviolet lithography, without compromising...
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