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

Jie Gao; McMillan, James F.; Ming-Chung Wu; Jiangjun Zheng; Assefa, Solomon; Chee Wei Wong
February 2010
Applied Physics Letters;2/1/2010, Vol. 96 Issue 5, p051123
Academic Journal
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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