Abstract
We demonstrate 2D diamond photonic crystal cavities operating at telecommunication wavelengths in a single crystal diamond membrane. Fully suspended 2D PhC cavities with a theoretical high Q factor of ~ 8×106 and relatively small V of ~2 (λ/n)3 are fabricated in a thin diamond membrane, which is supported by a polycrystalline diamond frame. We observe cavity resonances in the telecommunication O- and S-bands (1360-1470nm), measuring Q factors up to ~1800. Our results pave the way for developing diamond photonic devices at telecommunication wavelengths.
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