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We experimentally demonstrate a subwavelength refractive index engineered nanostructure for edge coupling, enabling a coupling efficiency of −0.4 dB and polarization independent operation for a broad spectral range exceeding 100 nm.
The coupling efficiency of a surface grating coupler is optimized for a an arbitrary buried oxide thickness by adjusting the grating radiation angle. The coupler is apodized using a subwavelength structure, allowing a single etch step fabrication. The measured coupling loss is −2.16dB with 3dB bandwidth of 64nm, for a minimum feature size of 100nm. It is also shown by simulations that by implementing...
Our progress in subwavelength structures in silicon waveguides is reviewed. Several practical implementations of subwavelength grating waveguides are discussed, including fibre-chip couplers, waveguide crossings and athermal waveguides.
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