Waveguide-Based Platform for Large-FOV Imaging of Optically Active Defects in 2D Materials

Glushkov, Evgenii; Archetti, Anna; Stroganov, Anton; Thakur, Mukeshchand; Navikas, Vytautas; Lihter, Martina; Marin, Juan Francisco Gonzalez; Babenko, Vitaliy; Hofmann, Stephan; Manley, Suliana; Radenović, Aleksandra

doi:10.1021/acsphotonics.9b01103

Cited by 15 publications

(21 citation statements)

References 60 publications

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“…Finally, we also checked the ON-OFF statistics of defects in as-grown hBN (Fig. 4c), which has a similar power-law distribution for both excitation wavelengths (αON ≈ -2.0, αOFF ≈ -1.5) to the ones reported in literature 12,15 .…”

Section: Figure 2 Confocal Imaging Of Directly-grown (A-c) Vs Transfe...supporting

confidence: 55%

“…SMLM has been recently used for the characterization of optically-active defects in 2D materials [11][12][13] , in particular those with "blinking" defects (stochastically switching between their ON and OFF states), such as in hexagonal Boron Nitride (hBN). Furthermore, the use of specialized on-chip imaging platforms 14 has drastically increased the throughput of the technique 15 .…”

Section: Introductionmentioning

confidence: 99%

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Direct Growth of Hexagonal Boron Nitride on Photonic Chips for High-Throughput Characterization

et al. 2021

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Adapting optical microscopy methods for nanoscale characterization of defects in two-dimensional (2D) materials is a vital step for photonic on-chip devices. To increase the analysis throughput, waveguidebased on-chip imaging platforms have been recently developed. Their inherent disadvantage, however, is the necessity to transfer the 2D material from the growth substrate to the imaging chip which introduces contamination, potentially altering the characterization results. Here we present a unique approach to circumvent these shortfalls by directly growing a widely-used 2D material (hexagonal boron nitride, hBN) on silicon nitride chips, and optically characterizing the defects in the intact as-grown material. We compare the direct growth approach to the standard wet transfer method, and confirm the clear advantages of the direct growth. While demonstrated with hBN in the current work, the method is easily extendable to other 2D materials.

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Section: Figure 2 Confocal Imaging Of Directly-grown (A-c) Vs Transfe...supporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Direct Growth of Hexagonal Boron Nitride on Photonic Chips for High-Throughput Characterization

et al. 2021

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“…The axial distance as well as the full dipolar orientation was determined for defect centers in multi-layer h-BN flakes by modification of the photonics density of states via phasechanging optical materials (VO 2 ) [101]. Examples of hybrid quantum photonics include defect centers in h-BN optically coupled to nanofibers [102], Si 3 N 4 microdisk optical resonators [29], waveguides [103,104], metallo-dielectric antennas [105] and Si 3 N 4 photonic crystal cavities [106]. Recently, ensemble defect centers in h-BN nanoflakes were coupled to nanofiber Bragg cavities by advanced pick and place technique [96].…”

Section: Quantum Photonics and Plasmonicsmentioning

confidence: 99%

Review on coherent quantum emitters in hexagonal boron nitride

Kubanek¹

2022

Preprint

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Hexagonal boron nitride is an emerging two-dimensional material with far-reaching applications in fields like nanophotonics or nanomechanics. Its layered architecture plays a key role for new materials such as Van der Waals heterostructures. The layered structure has also unique implications for hosted, optically active defect centers. A very special type of defect center arises from the possibility to host mechanically isolated orbitals localized between the layers. The resulting absence of coupling to low-frequency acoustic phonons turns out to be the essential element to protect the coherence of optical transitions from mechanical interactions with the environment. Consequently, the spectral transition linewidth remains unusually narrow even at room temperature, thus paving a new way towards coherent quantum optics under ambient conditions. In this review, I summarize the state-of-the-art of defect centers in hexagonal boron nitride with a focus on optically coherent defect centers. I discuss the current understanding of the defect centers, remaining questions and potential research directions to overcome pervasive challenges. The field is put into a broad perspective with impact on quantum technology such as quantum optics, quantum photonics as well as spin optomechanics.

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“…15,27 . Moreover, the defect centres in hBN have been coupled to nanophotonic devices, such as optical nanofibres, waveguides, metamaterials, and photonic crystals [28][29][30][31][32] .…”

Section: Introductionmentioning

confidence: 99%

Hybrid Device of Hexagonal Boron Nitride Nanoflakes with Defect Centres and a Nano-Fibre Bragg Cavity

Tashima¹,

Takashima²,

Schell³

et al. 2021

Preprint

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Solid-state quantum emitters coupled with a single mode fibre are of interest for photonic and quantum applications. In this context, nanofibre Bragg cavities (NFBCs), which are microcavities fabricated in an optical nanofibre, are promising devices because they can efficiently couple photons emitted from the quantum emitters to the single mode fibre. Recently, we have realized a hybrid device of an NFBC and a single colloidal CdSe/ZnS quantum dot. However, colloidal quantum dots exhibit inherent photo-bleaching. Thus, it is desired to couple an NFBC with defect centres in hexagonal boron nitride (hBN) as stable quantum emitters. In this work, we realize a hybrid system of an NFBC and defect centres in hBN nanoflakes. In this experiment, we fabricate NFBCs with a quality factor of 807 and a resonant wavelength at around 573 nm, which matches well with the fluorescent wavelength of the defect centres in hBN, using a helium focused ion beam (FIB) system. We also develop a manipulation system to place hBN nanoflakes on a cavity region of the NFBCs and realize a hybrid device with an NFBC. By exciting the nanoflakes via an objective lens and collecting the fluorescence through the NFBC, we observe a sharp emission peak at the resonant wavelength of the NFBC.

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Waveguide-Based Platform for Large-FOV Imaging of Optically Active Defects in 2D Materials

Cited by 15 publications

References 60 publications

Direct Growth of Hexagonal Boron Nitride on Photonic Chips for High-Throughput Characterization

Direct Growth of Hexagonal Boron Nitride on Photonic Chips for High-Throughput Characterization

Review on coherent quantum emitters in hexagonal boron nitride

Hybrid Device of Hexagonal Boron Nitride Nanoflakes with Defect Centres and a Nano-Fibre Bragg Cavity

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