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Fiber-taper collected emission from NV centers in high-Q/V diamond microdisks

Masuda, Tamiko, Hadden, John ORCID:, Lake, David, Mitchell, Matthew, Flågan, Sigurd and Barclay, Paul 2024. Fiber-taper collected emission from NV centers in high-Q/V diamond microdisks. Optics Express 32 (5) , pp. 8172-8188. 10.1364/OE.507325

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Fiber-coupled microdisks are a promising platform for enhancing the spontaneous emission from color centers in diamond. The measured cavity-enhanced emission from the microdisk is governed by the effective volume (V) of each cavity mode, the cavity quality factor (Q), and the coupling between the microdisk and the fiber. Here we observe room temperature photoluminescence from an ensemble of nitrogen-vacancy centers into high Q/V microdisk modes, which when combined with coherent spectroscopy of the microdisk modes, allows us to elucidate the relative contributions of these factors. The broad emission spectrum acts as an internal light source facilitating mode identification over several cavity free spectral ranges. Analysis of the fiber taper collected microdisk emission reveals spectral filtering both by the cavity and the fiber taper, the latter of which we find preferentially couples to higher-order microdisk modes. Coherent mode spectroscopy is used to measure Q ∼ 1 × 105 – the highest reported values for diamond microcavities operating at visible wavelengths. With realistic optimization of the microdisk dimensions, we predict that Purcell factors of ∼50 are within reach.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Optica Publishing Group
ISSN: 1094-4087
Date of First Compliant Deposit: 22 February 2024
Date of Acceptance: 4 December 2023
Last Modified: 28 Feb 2024 09:53

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