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We report on the fabrication of photonic crystal microcavities in GaAs having H1 and H2 defects for lattice constants as small as 255 nm. In H2 microcavities, we observed resonances with Q factors as high as 4000. The degeneracy of these high-Q modes is lifted by the imperfect nature of the fabrication process. © 2001 American Vacuum Society.
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