Using the Near-Field Coupling of a Sharp Tip to Tune Fluorescence-Emission Fluctuations during Quantum-Dot Blinking

Shafran, Eyal; Mangum, Benjamin D.; Gerton, Jordan M.

doi:10.1103/physrevlett.107.037403

Cited by 22 publications

(23 citation statements)

References 30 publications

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“…4 shows fluorescence time traces of the QD measured at SPCMs with 100 ms resolution. Fluorescence blinking is associated with carrier trapping at surface defects of the QD shell [31,32]. When coupled, the QD is in the bright state 90% of the time, whereas only 63% when uncoupled.…”

mentioning

confidence: 99%

High Purcell Factor Due To Coupling of a Single Emitter to a Dielectric Slot Waveguide

Kolchin¹,

Pholchai

Mikkelsen³

et al. 2014

Nano Lett.

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mentioning

confidence: 99%

High Purcell Factor Due To Coupling of a Single Emitter to a Dielectric Slot Waveguide

Kolchin¹,

Pholchai

Mikkelsen³

et al. 2014

Nano Lett.

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“…The inuence on the radiative and non-radiative decay rates of a QD by a nanoantenna observed via uorescence intermittency has been a topic of intense study 1,2,37 and several mechanisms are discussed in the literature. The inuence on the radiative and non-radiative decay rates of a QD by a nanoantenna observed via uorescence intermittency has been a topic of intense study 1,2,37 and several mechanisms are discussed in the literature.…”

Section: B Coupling Effects Between Single Emitters and Metallic Strmentioning

confidence: 99%

Coupling single quantum dots to plasmonic nanocones: optical properties

Meixner

Jäger

et al. 2015

Faraday Discuss.

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Coupling a single quantum emitter, such as a fluorescent molecule or a quantum dot (QD), to a plasmonic nanostructure is an important issue in nano-optics and nano-spectroscopy, relevant for a wide range of applications, including tip-enhanced near-field optical microscopy, plasmon enhanced molecular sensing and spectroscopy, and nanophotonic amplifiers or nanolasers, to mention only a few. While the field enhancement of a sharp nanoantenna increasing the excitation rate of a very closely positioned single molecule or QD has been well investigated, the detailed physical mechanisms involved in the emission of a photon from such a system are, by far, less investigated. In one of our ongoing research projects, we try to address these issues by constructing and spectroscopically analysing geometrically simple hybrid heterostructures consisting of sharp gold cones with single quantum dots attached to the very tip apex. An important goal of this work is to tune the longitudinal plasmon resonance by adjusting the cones' geometry to the emission maximum of the core-shell CdSe/ZnS QDs at nominally 650 nm. Luminescence spectra of the bare cones, pure QDs and hybrid systems were distinguished successfully. In the next steps we will further investigate, experimentally and theoretically, the optical properties of the coupled systems in more detail, such as the fluorescence spectra, blinking statistics, and the current results on the fluorescence lifetimes, and compare them with uncoupled QDs to obtain a clearer picture of the radiative and non-radiative processes.

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“…This idea is verified using a single-wall carbon nanotube (CNT) attached to an AFM probe since CNTs are strong fluorescence quenchers, but not strong light scatterers21. As Fig.…”

Section: Discussionmentioning

confidence: 87%

“…Figure 2 shows experimental measurements of the total fluorescence signal (panel A) and DOP (panel B) from a QD as a function of the position of a gold-coated tip within an xz -plane that cuts through the center of the QD. The total emission from the QD is strongly quenched in the near field of the tip mainly due to nonradiative energy transfer followed by thermal dissipation in the tip21. Clearly, the DOP decreases for small tip distances directly above the QD, indicating the emission polarization has equal x and y components.…”

Section: Resultsmentioning

confidence: 99%

Using a Sharp Metal Tip to Control the Polarization and Direction of Emission from a Quantum Dot

Ghimire

Shafran

Gerton

2014

Sci Rep

Self Cite

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Optical antennas can be used to manipulate the direction and polarization of radiation from an emitter. Usually, these metallic nanostructures utilize localized plasmon resonances to generate highly directional and strongly polarized emission, which is determined predominantly by the antenna geometry alone, and is thus not easily tuned. Here we show experimentally that the emission polarization can be manipulated using a simple, nonresonant scanning probe consisting of the sharp metallic tip of an atomic force microscope; finite element simulations reveal that the emission simultaneously becomes highly directional. Together, the measurements and simulations demonstrate that interference between light emitted directly into the far field with that elastically scattered from the tip apex in the near field is responsible for this control over polarization and directionality. Due to the relatively weak emitter-tip coupling, the tip must be positioned very precisely near the emitter, but this weak coupling also leads to highly tunable emission properties with a similar degree of polarization and directionality compared to resonant antennas.

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Using the Near-Field Coupling of a Sharp Tip to Tune Fluorescence-Emission Fluctuations during Quantum-Dot Blinking

Cited by 22 publications

References 30 publications

High Purcell Factor Due To Coupling of a Single Emitter to a Dielectric Slot Waveguide

High Purcell Factor Due To Coupling of a Single Emitter to a Dielectric Slot Waveguide

Coupling single quantum dots to plasmonic nanocones: optical properties

Using a Sharp Metal Tip to Control the Polarization and Direction of Emission from a Quantum Dot

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