Veetil, Vijin KizhakeSong, JunyeobNamboodiri, Pradeep N.Ebadollahi, NikkiChanana, AshishKatzenmeyer, Aaron M.Pederson, ChristianPomeroy, Joshua M.Chiles, JeffreyShainline, JeffreySrinivasan, KartikDavanco, MarceloPelton, Matthew2025-01-082025-01-082024-11-19Veetil, Vijin Kizhake, Junyeob Song, Pradeep N. Namboodiri, Nikki Ebadollahi, Ashish Chanana, Aaron M. Katzenmeyer, Christian Pederson, et al. “Enhanced Zero-Phonon Line Emission from an Ensemble of W Centers in Circular and Bowtie Bragg Grating Cavities.” Nanophotonics, November 19, 2024. https://doi.org/10.1515/nanoph-2024-0485.https://doi.org/10.1515/nanoph-2024-0485http://hdl.handle.net/11603/37263Color centers in silicon have recently gained considerable attention as single-photon sources and as spin qubit-photon interfaces. However, one of the major bottlenecks to the application of silicon color centers is their low overall brightness due to a relatively slow emission rate and poor light extraction from silicon. Here, we increase the photon collection efficiency from an ensemble of a particular kind of color center, known as W centers, by embedding them in circular Bragg grating cavities resonant with their zero-phonon-line emission. We observe a ≈5-fold enhancement in the photon collection efficiency (the fraction of photons extracted from the sample and coupled into a single-mode fiber), corresponding to an estimated ≈11-fold enhancement in the photon extraction efficiency (the fraction of photons collected by the first lens above the sample). For these cavities, we observe lifetime reduction by a factor of ≈1.3 . For W centers in resonant bowtie-shaped cavities, we observed a ≈3-fold enhancement in the photon collection efficiency, corresponding to a ≈6-fold enhancement in the photon extraction efficiency, and observed a lifetime reduction factor of ≈1.1 . The bowtie cavities thus preserve photon collection efficiency and Purcell enhancement comparable to circular cavities while providing the potential for utilizing in-plane excitation methods to develop a compact on-chip light source.10 pagesen-USThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.Public Domainhttps://creativecommons.org/publicdomain/mark/1.0/color centerPurcell factorenhanced emissionsilicon defectquantum emitterEnhanced zero-phonon line emission from an ensemble of W centers in circular and bowtie Bragg grating cavitiesText