Abstract
We have realized a suspended, high-reflectivity focusing metamirror (f = 10 cm, R ≈ 99%), by gradient pitch photonic crystal patterning of a Si3N4 membrane. The design enables construction of stable, ultra-short (L = 30 µm), high-finesse (ℱ > 200) cavities for optomechanical sensing and quantum experiments.
© 2023 The Author(s)
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