Bright single-nanocrystal upconversion at sub 0.5 W cm−2 irradiance via coupling to single nanocavity mode

Meng, Yansong; Huang, Dingxin; Li, Hong; Xia, Feng; Li, Feng; Liang, Qiao‐Mei; Ma, Tianzi; Han, Jiahao; Tang, Jianwei; Chen, Guanying; Chen, Xue-Wen

doi:10.1038/s41566-022-01101-z

Cited by 29 publications

(14 citation statements)

References 49 publications

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“…For instance, cavities constructed from plasmonic metamolecules can control the luminescence intensities and lifetimes of emitters, making them useful for quantum information science when filled with single-photon emitters such as semiconductor quantum dots, [61] and for sensing and lasing when combined with up conversion NPs. [62,63] Plasmonic enhancement of semiconductor NP absorption can lead to more efficient and singlestructure photodetectors. [64] These techniques can be used to create miniaturized optoelectronic devices for emission and detection.…”

Section: Discussionmentioning

confidence: 99%

Open and Close‐Packed, Shape‐Engineered Polygonal Nanoparticle Metamolecules with Tailorable Fano Resonances

et al. 2023

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A top‐down lithographic patterning and deposition process is reported for producing nanoparticles (NPs) with well‐defined sizes, shapes, and compositions that are often not accessible by wet‐chemical synthetic methods. These NPs are ligated and harvested from the substrate surface to prepare colloidal NP dispersions. Using a template‐assisted assembly technique, fabricated NPs are driven by capillary forces to assemble into size‐ and shape‐engineered templates and organize into open or close‐packed multi‐NP structures or NP metamolecules. The sizes and shapes of the NPs and of the templates control the NP number, coordination, interparticle gap size, disorder, and location of defects such as voids in the NP metamolecules. The plasmonic resonances of polygonal‐shaped Au NPs are exploited to correlate the structure and optical properties of assembled NP metamolecules. Comparing open and close‐packed architectures highlights that introduction of a center NP to form close‐packed assemblies supports collective interactions, altering magnetic optical modes and multipolar interactions in Fano resonances. Decreasing the distance between NPs strengthens the plasmonic coupling, and the structural symmetries of the NP metamolecules determine the orientation‐dependent scattering response.

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Section: Discussionmentioning

confidence: 99%

Open and Close‐Packed, Shape‐Engineered Polygonal Nanoparticle Metamolecules with Tailorable Fano Resonances

et al. 2023

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“…Most recently, Meng et al [ 99 ] realized single nanocrystal upconversion in a single plasmonic nanocavity mode by in situ controllable coupling and doping. An experimental platform was built to tune the nanocavity field and control the doping concentration of UCNCs.…”

Section: Upconversion Nanoparticles From Near-infrared To Visible Regionmentioning

confidence: 99%

“…The outermost shell, as a protective layer, suppressed the energy transfer to surface defects, while the spacer layer mitigated the plasmonic quenching by coupling the UCL predominantly to the fundamental dipole mode. A nearly continuous evolution of the Purcell [ 100 , 101 ] enhancement for the same single nanocrystal was realized, which showed the general existence of UCL plasmonic enhancement saturation phenomena, as well as the doping- and coupling-dependent UCL enhancement factors up to 2.3 × 10 5 [ 99 ].…”

Section: Upconversion Nanoparticles From Near-infrared To Visible Regionmentioning

confidence: 99%

“…UCNPs are actively pursued as anti-stock emitters for various applications, such as bioimaging, solar energy harvesting, catalysis, displays, anti-counterfeiting, sensing, and lasers [ 99 ]. To enhance UCL, researchers improved the internal material properties (composition, doping, and surface structure) of nanocrystals while simultaneously using plasmonic coupling to improve engineered external optical responses.…”

Section: Upconversion Nanoparticles From Near-infrared To Visible Regionmentioning

confidence: 99%

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Wavelength-Dependent Metal-Enhanced Fluorescence Biosensors via Resonance Energy Transfer Modulation

Lee

Kang

2023

Biosensors

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Fluorescence can be enhanced or quenched depending on the distance between the surface of a metal nanoparticle and the fluorophore molecule. Fluorescence enhancement by nearby metal particles is called metal-enhanced fluorescence (MEF). MEF shows promising potential in the field of fluorescence-based biological sensing. MEF-based biosensor systems generally fall into two platform categories: (1) a two/three-dimensional scaffold, or (2) a colloidal suspension. This review briefly summarizes the application studies using wavelength-dependent carbon dots (UV-VIS), noble metals (VIS), and upconversion nanoparticles (NIR to VIS), representative nanomaterials that contribute to the enhancement of fluorescence through the resonance energy transfer modulation and then presents a perspective on this topic.

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“…Generating a light beam or an optical field with tighter spatial confinement is always of great interest in both fundamental research and technological applications ranging from ultratight field confinement, 1 – 12 nanoscale light–matter interaction, 13 – 17 to superresolution optical imaging 18 – 21 Due to the optical diffraction limit, 22 optical confinement with a conventional dielectric component (e.g., a lens) cannot be better than λ/2n, where λ is the vacuum wavelength of light and n is the refractive index of the medium.…”

Section: Introductionmentioning

confidence: 99%

Generating a sub-nanometer-confined optical field in a nanoslit waveguiding mode

Liu

Zhou

et al. 2023

Adv. Photon.

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We propose to generate a sub-nanometer-confined optical field in a nanoslit waveguiding mode in a coupled nanowire pair (CNP). We show that, when a conventional waveguide mode with a proper polarization is evanescently coupled into a properly designed CNP with a central nanoslit, it can be efficiently channeled into a high-purity nanoslit mode within a waveguiding length <10 μm. The CNP can be either freestanding or on-chip by using a tapered fiber or planar waveguide for input-coupling, with a coupling efficiency up to 95%. Within the slit region, the output diffraction-limited nanoslit mode offers an extremely confined optical field (∼0.3 nm × 3.3 nm) with a peak-to-background ratio higher than 25 dB and can be operated within a 200-nm bandwidth. The group velocity dispersion of the nanoslit mode for ultrafast pulsed operation is also briefly investigated. Compared with the previous lasing configuration, the waveguiding scheme demonstrated here is not only simple and straightforward in structural design but is also much flexible and versatile in operation. Therefore, the waveguiding scheme we show here may offer an efficient and flexible platform for exploring light-matter interactions beyond the nanometer scale, and developing optical technologies ranging from superresolution nanoscopy and atom/molecule manipulation to ultra-sensitivity detection.

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Bright single-nanocrystal upconversion at sub 0.5 W cm−2 irradiance via coupling to single nanocavity mode

Cited by 29 publications

References 49 publications

Open and Close‐Packed, Shape‐Engineered Polygonal Nanoparticle Metamolecules with Tailorable Fano Resonances

Open and Close‐Packed, Shape‐Engineered Polygonal Nanoparticle Metamolecules with Tailorable Fano Resonances

Wavelength-Dependent Metal-Enhanced Fluorescence Biosensors via Resonance Energy Transfer Modulation

Generating a sub-nanometer-confined optical field in a nanoslit waveguiding mode

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