Abstract
The localization of light to less than a cubic wavelength, ${\ensuremath{\lambda}}^{3},$ in all three dimensions has important quantum consequences. A defect formed inside a three-dimensional (3D) photonic crystal provides a unique optical environment for light localization. Single-mode defect cavities were built from an infrared 3D photonic crystal. A cavity state with a modal volume of $2\ifmmode\times\else\texttimes\fi{}(\ensuremath{\lambda}{/2)}^{3}$ was observed. This is, to the best of our knowledge, the smallest cavity mode in a 3D photonic crystal ever observed at infrared wavelengths.
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