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Optomechanical coupling produced by high finesse optical micro-cavities has led to a plethora of nonlinear observations in silicon photonics due to the coherent nature of the interaction. We have investigated optomechanical coupling in the dielectric-like cavity modes of photonic crystal edge defects. These structures exhibit extreme sensitivity to changes of the edge defect width, allowing for scaling of the edge length and a reduction of the optical finesse required to produce different phenomena independent of the edge width. The edge defect structures presented have relatively simpler fabrication relative to other optomechanical designs of comparable coupling strength. We report frequency combing in long linear edge defects and optical bi-stability in shorter, hexagonally coupled edge defect devices. These results indicate that photonic crystal edge defects offer an exciting platform for the development of new optomechanical devices.
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Brett Poulsen, Michael Zylstra, Jayshri Sabarinathan, "Optical bistability and frequency combing in silicon edge defect photonic crystals," Proc. SPIE 11358, Nonlinear Optics and its Applications 2020, 1135806 (13 April 2020); https://doi.org/10.1117/12.2555888