Purcell and Collection Efficiency Enhancement of Single NV‐ Center Emission Coupled to an Asymmetric Tamm Structure

Abstract

The resonant modes associated with engineered photonic structures of different spatial‐dimension are essential to obtain bright on‐demand single photon sources for quantum technologies. Negatively‐charged nitrogen‐vacancy (NV‐) center in diamond is proposed as an excellent single‐photon source at room temperature. The possible optical readout of spin states in diamond makes it a good candidate for the spin‐photon interface. However, poor light collection, feeble zero‐phonon line, low emission rate, and broad phonon‐induced emission limit the use of NV‐ centers in quantum technologies. Here, a feasible, easy‐to‐fabricate, asymmetric Tamm structure coupled with a single NV‐ center to enhance the emission rate of zero phonon line (ZPL) with better light collection efficiency is presented. The asymmetric Tamm structure shows dual resonant mode with one of the modes coinciding with NV‐ ZPL wavelength of 640 nm. The mode quality factor (Q‐factor) is 140, which is greater than the Q‐factor of conventional Tamm structure and hence, improved field intensity localization. The authors achieved four times Purcell enhancement and five times enhanced light collection efficiency at 640 nm. The proposed asymmetric Tamm structure helps to generate bright single photons using NV‐ center and improves the efficacy of the spin‐photon interface.

Enhancing the Emission Rate of the Inherent Silicon‐Vacancy Center Using Optimized Multipolar Moments in a Silicon Carbide Metasurface

“…The emission decay rate (Γ) is proportional to available LDOS at the emission frequency 𝜔 eg according to Fermi's golden rule [40] : Γ = emitter is placed in the vicinity of these enhanced fields there is an increased interaction with LDOS that further leads to an enhanced emission rate. [41] We consider V − Si in 4H-SiC as a two-level system with an excited state |e⟩ and ground state |g⟩ with transition dipole moment p eg = ⟨g|d|e⟩, d being the transition operator and ℏ is Plank's constant. The emission decay rate for a two-level system in a vacuum is given as Γ 0 = 𝜔 3 eg 3𝜋ℏ∈ 0 c 3 |p eg | 2 .…”

A Coupled‐Dipolar Plasmonic Antenna for Enhanced and Directional Emission from a Single NV Center at the Generalized Kerker Condition

“…[2] Therefore, present-day quantum technological applications use SPS based on spontaneous parametric downconversion processes, which provide indeterministic photon emission. [2] To increase the photon generation and, subsequently, the photon collection rates (PCR) from deterministic solid-state SPS, various resonator schemes such as photonic cavities, [7,8] plasmonic nano-resonators, [9] or hyperbolic meta-materials [10] are explored. The maximum photon collection rate of 20 Mcps is achieved from a single negatively-charged nitrogen-vacancy (NV − ) center in a nanodiamond integrated into a plasmonic gap-cavity patch-antenna resonator.…”