Greatly Enhanced Emission from Spin Defects in Hexagonal Boron Nitride Enabled by a Low-Loss Plasmonic Nano-Cavity
| Autor: | Xiaohui Xu, Abhishek B. Solanki, Demid Sychev, Xingyu Gao, Samuel Peana, Aleksandr S. Baburin, Karthik Pagadala, Zachariah O. Martin, Sarah N. Chowdhury, Yong P. Chen, Takashi Taniguchi, Kenji Watanabe, Ilya A. Rodionov, Alexander V. Kildishev, Tongcang Li, Pramey Upadhyaya, Alexandra Boltasseva, Vladimir M. Shalaev |
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| Rok vydání: | 2022 |
| Předmět: |
Condensed Matter - Mesoscale and Nanoscale Physics
nanocavities Mechanical Engineering FOS: Physical sciences Bioengineering General Chemistry Condensed Matter Physics hBN plasmonics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) General Materials Science quantum sensing two-dimensional materials spin defects Physics - Optics Optics (physics.optics) |
| Zdroj: | Xu, X, Solanki, A B, Sychev, D, Gao, X, Peana, S, Baburin, A S, Pagadala, K, Martin, Z O, Chowdhury, S N, Chen, Y P, Taniguchi, T, Watanabe, K, Rodionov, I A, Kildishev, A V, Li, T, Upadhyaya, P, Boltasseva, A & Shalaev, V M 2023, ' Greatly Enhanced Emission from Spin Defects in Hexagonal Boron Nitride Enabled by a Low-Loss Plasmonic Nanocavity ', Nano Letters, vol. 23, no. 1, pp. 25-33 . https://doi.org/10.1021/acs.nanolett.2c03100 |
| DOI: | 10.48550/arxiv.2207.08357 |
| Popis: | Two-dimensional hexagonal boron nitride (hBN) has been known to host a variety of quantum emitters with properties suitable for a broad range of quantum photonic applications. Among them, the negatively charged boron vacancy (VB-) defect with optically addressable spin states has emerged recently due to its potential use in quantum sensing. Compared to spin defects in bulk crystals, VB- preserves its spin coherence properties when placed at nanometer-scale distances from the hBN surface, enabling nanometer-scale quantum sensing. On the other hand, the low quantum efficiency of VB- has hindered its use in practical applications. Several studies have reported improving the overall quantum efficiency of VB- defects using plasmonic effects; however, the overall enhancements of up to 17 times reported to date are relatively modest. In this study, we explore and demonstrate much higher emission enhancements of VB- with ultralow-loss nano-patch antenna (NPA) structures. An overall intensity enhancement of up to 250 times is observed for NPA-coupled VB- defects. Since the laser spot exceeds the area of the NPA, where the enhancement occurs, the actual enhancement provided by the NPA is calculated to be ~1685 times, representing a significant increase over the previously reported results. Importantly, the optically detected magnetic resonance (ODMR) contrast is preserved at such exceptionally strong enhancement. Our results not only establish NPA-coupled VB- defects as high-resolution magnetic field sensors operating at weak laser powers, but also provide a promising approach to obtaining single VB- defects. Comment: 17 pages, 4 figures |
| Databáze: | OpenAIRE |
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