Enhanced zero-phonon line emission from an ensemble of W centers in circular and bowtie Bragg grating cavities

Published

November 19, 2024

Author(s)

Vijin Kizhake Veetil, Junyeob Song, Pradeep Namboodiri, Nikki Ebadollahi, Ashish Chanana, Aaron Katzenmeyer, Christian Pederson, Joshua Pomeroy, Jeff Chiles, Jeff Shainline, Kartik Srinivasan, Marcelo Davanco, Matthew Pelton

Abstract

Color centers in silicon have recently gained considerable attention as a single-photon source [1,2] and as a spin qubit-photon interface [3] for quantum information applications. However, one of the major bottlenecks is their low overall brightness due to a weak emission rate and poor light extraction from silicon. Here, we investigate a particular kind of color center, called W centers, and increase the photon collection efficiency from an ensemble of W centers by embedding them in circular Bragg grating (CBG) cavities. For a single W-center dipole located in the antinode of the resonant cavity, we expect a moderate Purcell enhancement (Fp = 4.5) and high photon extraction efficiency (η = 65%). In this work, we observe a 5-fold enhancement in the photon collection efficiency and estimate a 11-fold enhancement in the photon extraction efficiency (collection enhancement to the first lens) for an ensemble of W centers in zero-phonon line resonant CBG cavities. We also observe a lifetime reduction factor of 1.26 ± 0.07 from time-resolved photoluminescence measurements for these W centers, indicating Purcell enhancement. We also investigated W centers in resonant bowtie-shaped cavities, observed a 3-fold enhancement in the photon collection efficiency, and estimated a 6-fold enhancement in the photon extraction efficiency together with a lifetime reduction factor of 1.08 ± 0.06. Our findings suggest that bowtie-shaped cavities demonstrate a photon collection efficiency and Purcell enhancement comparable to CBG cavities, showing great potential for utilizing in-plane excitation methods to develop a compact on-chip light source.

Citation

Nanophotonics

Pub Type

Journals

Download Paper

https://doi.org/10.1515/nanoph-2024-0485

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Keywords

Nanophotonics, color centers in silicon, quantum photonics

Citation

Kizhake Veetil, V. , Song, J. , Namboodiri, P. , Ebadollahi, N. , Chanana, A. , Katzenmeyer, A. , Pederson, C. , Pomeroy, J. , Chiles, J. , Shainline, J. , Srinivasan, K. , Davanco, M. and Pelton, M. (2024), Enhanced zero-phonon line emission from an ensemble of W centers in circular and bowtie Bragg grating cavities, Nanophotonics, [online], https://doi.org/10.1515/nanoph-2024-0485, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=958659 (Accessed April 24, 2025)