Channel competition in emitter-plasmon coupling

Xia, Juan; Tang, Jianwei; Bao, Fanglin; Evans, Julian; He, Sailing

doi:10.1364/oe.27.030893

Cited by 2 publications

(3 citation statements)

References 52 publications

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“…Since local-field probing relies on the detection of the fluorescence of the QD, it is important to know the fluorescence properties, which may be significantly influenced by the nanoantenna due to the Purcell effect 10 , 50 – 52 . Antenna modes can provide a large local density of photonic states (LDOS), and then, according to Fermi’s golden rule, the radiative decay rate of the QD will be enhanced via energy transfer to the antenna modes 53 , 54 . Owing to the broad bandwidth of the antenna resonance, although the emission wavelength of the QD (~808 nm) is far detuned from the resonant peak of the nanoantenna (~645 nm), the measured fluorescence lifetime of the QD is still shortened by ~7-fold (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The local-field response reveals how the incident light excites the antenna modes; therefore, it depends on the polarization of the incident light. The LDOS indicates how the emitter excites the antenna modes 53,54 ; therefore, it depends on the position and orientation of the emitter but does not depend on the incident light polarization. The local-field response and LDOS are similar only when the incident light and the emitter excite the antenna modes in a similar way.…”

Section: Discussionmentioning

confidence: 99%

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Turning a hot spot into a cold spot: polarization-controlled Fano-shaped local-field responses probed by a quantum dot

et al. 2020

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Optical nanoantennas can convert propagating light to local fields. The local-field responses can be engineered to exhibit nontrivial features in spatial, spectral and temporal domains, where local-field interferences play a key role. Here, we design nearly fully controllable local-field interferences in the nanogap of a nanoantenna, and experimentally demonstrate that in the nanogap, the spectral dispersion of the local-field response can exhibit tuneable Fano lineshapes with nearly vanishing Fano dips. A single quantum dot is precisely positioned in the nanogap to probe the spectral dispersions of the local-field responses. By controlling the excitation polarization, the asymmetry parameter q of the probed Fano lineshapes can be tuned from negative to positive values, and correspondingly, the Fano dips can be tuned across a broad spectral range. Notably, at the Fano dips, the local-field intensity is strongly suppressed by up to ~50-fold, implying that the hot spot in the nanogap can be turned into a cold spot. The results may inspire diverse designs of local-field responses with novel spatial distributions, spectral dispersions and temporal dynamics, and expand the available toolbox for nanoscopy, spectroscopy, nano-optical quantum control and nanolithography.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Turning a hot spot into a cold spot: polarization-controlled Fano-shaped local-field responses probed by a quantum dot

et al. 2020

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“…It is known that at this length scale, gold nanoparticles exhibit plasmonic effects, which are coherent oscillation of conducting d band electrons in response to the incident light (Willets et al, 2017 ). In the context of SMLM, plasmonic effects can potentially produce two outcomes, the first is that the emitting center can be shifted by the complex plasmon-molecular interactions (Xia et al, 2019 ), shrinking the images, and this is not favored (Cheng et al, 2019 ). The second is that it could produce significant signal enhancement which leads to higher localization precision, and is hence preferred.…”

Section: Challenges and Emerging Directionsmentioning

confidence: 99%

Probing Biosensing Interfaces With Single Molecule Localization Microscopy (SMLM)

Cheng

Yin

2021

Front. Chem.

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Far field single molecule localization microscopy (SMLM) has been established as a powerful tool to study biological structures with resolution far below the diffraction limit of conventional light microscopy. In recent years, the applications of SMLM have reached beyond traditional cellular imaging. Nanostructured interfaces are enriched with information that determines their function, playing key roles in applications such as chemical catalysis and biological sensing. SMLM enables detailed study of interfaces at an individual molecular level, allowing measurements of reaction kinetics, and detection of rare events not accessible to ensemble measurements. This paper provides an update to the progress made to the use of SMLM in characterizing nanostructured biointerfaces, focusing on practical aspects, recent advances, and emerging opportunities from an analytical chemistry perspective.

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Channel competition in emitter-plasmon coupling

Cited by 2 publications

References 52 publications

Turning a hot spot into a cold spot: polarization-controlled Fano-shaped local-field responses probed by a quantum dot

Turning a hot spot into a cold spot: polarization-controlled Fano-shaped local-field responses probed by a quantum dot

Probing Biosensing Interfaces With Single Molecule Localization Microscopy (SMLM)

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