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We experimentally demonstrate an InP nanocavity with a mode volume of 0.26 (λ/2n)3. This is an order of magnitude smaller than the mode volumes previously demonstrated in photonic crystal point-defect cavities realized in III-V materials and four times smaller than what is often referred to as the diffraction-limited volume, Vλ= (λ/2n)3. The nanocavity is designed using topology optimization, taking into account fabrication limitations, which are pushed compared to the state-of-the-art. This work thus introduces a new class of cavities featuring extreme dielectric confinement (EDC) into the realm of III-V semiconductors, offering order-of-magnitude Purcell-enhancement of the radiative rate. EDC nanocavities may thus be employed to significantly improve the properties of nanolasers, nanoLEDs and single-photon sources, among other applications.

Original languageEnglish
JournalOptical Materials Express
Issue number2
Pages (from-to)397-406
Publication statusPublished - 2024


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