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Demonstration of an air-slot mode-gap confined photonic crystal slab nanocavity with ultrasmall mode volumes

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6 Author(s)
Jie Gao ; Optical Nanostructures Laboratory, Columbia University, New York, New York 10027, USA ; McMillan, J.F. ; Wu, Ming-Chung ; Jiangjun Zheng
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We demonstrate experimentally an air-slot mode-gap photonic crystal cavity with quality factor of 104 and modal volume of 0.02 cubic wavelengths, based on the design of an air-slot in a width-modulated line-defect in a photonic crystal slab. The origin of the high Q air-slot cavity mode is the mode-gap effect from the slotted PhCWG mode with negative dispersion. The high Q cavities with ultrasmall mode volume are important for applications such as cavity quantum electrodynamics, nonlinear optics, and optical sensing.

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Applied Physics Letters  (Volume:96 ,  Issue: 5 )