Coupling spin defects in hexagonal boron nitride to titanium dioxide ring resonators

Nonahal, Milad; Li, Chi; Tjiptoharsono, Febiana; Ding, Lei; Stewart, Connor; Scott, John; Toth, Milos; Ha, Son Tung; Kianinia, Mehran; Aharonovich, Igor

doi:10.1039/d2nr02522a

Cited by 8 publications

(3 citation statements)

References 38 publications

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“…However, the use of V B - defects in practical quantum technologies is fundamentally limited by the low quantum efficiency, affected by intrinsic non-radiative processes and competing long-lived metastable states that limit the radiative transition rate. To overcome these drawbacks, enhancing the emission rate by coupling V B - centers to optical resonators, such as dielectric antennas 22 , 23 , nanobeam cavities 24 , or plasmonic gap antennas 25 – 27 has been attempted. However, these approaches offered localized solutions lacking on-chip scaling prospects and yielding enhancements that are either broadband, with low control over the deterministic cavity-emitter coupling, or narrowband but limited by relatively low coupling efficiency.…”

Section: Introductionmentioning

confidence: 99%

Optically addressable spin defects coupled to bound states in the continuum metasurfaces

Sortino,

Gale,

Kühner

et al. 2024

Nat Commun

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Van der Waals (vdW) materials, including hexagonal boron nitride (hBN), are layered crystalline solids with appealing properties for investigating light-matter interactions at the nanoscale. hBN has emerged as a versatile building block for nanophotonic structures, and the recent identification of native optically addressable spin defects has opened up exciting possibilities in quantum technologies. However, these defects exhibit relatively low quantum efficiencies and a broad emission spectrum, limiting potential applications. Optical metasurfaces present a novel approach to boost light emission efficiency, offering remarkable control over light-matter coupling at the sub-wavelength regime. Here, we propose and realise a monolithic scalable integration between intrinsic spin defects in hBN metasurfaces and high quality (Q) factor resonances, exceeding 102, leveraging quasi-bound states in the continuum (qBICs). Coupling between defect ensembles and qBIC resonances delivers a 25-fold increase in photoluminescence intensity, accompanied by spectral narrowing to below 4 nm linewidth and increased narrowband spin-readout efficiency. Our findings demonstrate a new class of metasurfaces for spin-defect-based technologies and pave the way towards vdW-based nanophotonic devices with enhanced efficiency and sensitivity for quantum applications in imaging, sensing, and light emission.

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Section: Introductionmentioning

confidence: 99%

Optically addressable spin defects coupled to bound states in the continuum metasurfaces

Sortino,

Gale,

Kühner

et al. 2024

Nat Commun

Self Cite

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“…Deterministic positioning has since been achieved using pick-and-place methods that require secondary dielectric deposition to fully embed the emitter within the cavity and can still suffer from random out-of-plane dipole orientations. In contrast, single B-centers have in-plane dipoles and can be positioned deterministically relatively easily in prefabricated hBN photonic structures, 35 making them uniquely suited to monolithic integration with CBG devices.…”

Section: ■ Introductionmentioning

confidence: 99%

Monolithic Integration of Single Quantum Emitters in hBN Bullseye Cavities

Spencer,

Horder,

Kim

et al. 2023

ACS Photonics

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The ability of hexagonal boron nitride to host quantum emitters in the form of deep-level color centers makes it an important material for quantum photonic applications. This work utilizes a monolithic circular Bragg grating device to enhance the collection of single photons with a 436 nm wavelength emitted from quantum emitters in hexagonal boron nitride. We observe a 6-fold increase in collected intensity for a single-photon emitter coupled to a device compared to an uncoupled emitter and show exceptional spectral stability at cryogenic temperature. The devices were fabricated by using a number of etching methods, beyond standard fluorine-based reactive ion etching, and the quantum emitters were created by using a site-specific electron beam irradiation technique. Our work demonstrates the potential of monolithically integrated systems for deterministically placed quantum emitters using a variety of fabrication options.

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“…The simulation matches well with the measurement. By using more efficient detection techniques (e.g., the photonic cavities − ), as well as the better h -BN samples with high-concentration and high-contrast defects, ,, the DC magnetic field sensitivity of V B – can be further significantly enhanced.…”

mentioning

confidence: 99%

DC Magnetic Field Sensitivity Optimization of Spin Defects in Hexagonal Boron Nitride

et al. 2023

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Spin defects existing in van der Waals materials attract wide attention thanks to their natural advantages for in situ quantum sensing, especially the negatively charged boron vacancy (V B − ) centers in hexagonal boron nitride (h-BN). Here we systematically investigate the laser and microwave power broadening in continuous-wave optically detected magnetic resonance (ODMR) of the V B − ensemble in h-BN, by revealing the behaviors of ODMR contrast and line width as a function of the laser and microwave powers. The experimental results are well explained by employing a two-level simplified model of ODMR dynamics. Furthermore, with optimized power, the DC magnetic field sensitivity of V B − ensemble is significantly improved up to 2.87 ± 0.07 μT/ Hz . Our results provide important suggestions for further applications of V B − centers in quantum information processing and ODMR-based quantum sensing.

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Coupling spin defects in hexagonal boron nitride to titanium dioxide ring resonators

Abstract: Spin-dependent optical transitions are attractive for a plethora of applications in quantum technologies. Here we report on utilization of high quality ring resonators fabricated from TiO2 to enhance the emission...

Cited by 8 publications

References 38 publications

Optically addressable spin defects coupled to bound states in the continuum metasurfaces

Optically addressable spin defects coupled to bound states in the continuum metasurfaces

Monolithic Integration of Single Quantum Emitters in hBN Bullseye Cavities

DC Magnetic Field Sensitivity Optimization of Spin Defects in Hexagonal Boron Nitride

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