Modification of spontaneous emission rates in single colloidal CdSe/ZnS quantum dots by a submicron-sized dielectric disk

Yuan, Chi‐Tsu; Wang, Y. C.; Yang, Yi; Wu, Meng‐Chyi; Tang, Jau; Shih, Min‐Hsiung

doi:10.1063/1.3622641

Cited by 5 publications

(8 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Emission behavior of QDs can flexibly be modulated by metallic surface, − photonic crystals, − hyperbolic metamaterials, , plasmonic nanocavities, − and graphene (or carbon). − It has been reported that emission intensity and emission rate of QDs were enhanced when QDs were close to the metallic surface, photonic crystals, hyperbolic metamaterials, and plasmonic nanocavities, although the mechanisms are different for different types of materials. Apart from the modulation over emission intensity and emission rate, metallic surface and nanocavities also engineer the single-photon emission behavior of QDs. − ,− …”

Section: Introductionmentioning

confidence: 99%

“…Colloidal quantum dots (QDs), a zero-dimensional quantum emitter, have drawn intense attention over the past two decades because of their interesting optical properties, superior quantum yield, high emission intensity, and single-photon emission at room temperature. − QDs have been used to investigate the modulation and engineering of spontaneous emission, which is regarded as the heart of nano-optics and photonics, − and has significant implications in the fields of energy, communication, and quantum optics. Emission behavior of QDs can flexibly be modulated by metallic surface, − photonic crystals, − hyperbolic metamaterials, , plasmonic nanocavities, − and graphene (or carbon). − It has been reported that emission intensity and emission rate of QDs were enhanced when QDs were close to the metallic surface, photonic crystals, hyperbolic metamaterials, and plasmonic nanocavities, although the mechanisms are different for different types of materials. Apart from the modulation over emission intensity and emission rate, metallic surface and nanocavities also engineer the single-photon emission behavior of QDs. − ,− …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced Multiphoton Emission from CdTe/ZnS Quantum Dots Decorated on Single-Layer Graphene

Liu

Kumar

et al. 2015

J. Phys. Chem. C

View full text Add to dashboard Cite

Time-resolved single-molecule spectroscopy of individual colloidal CdTe/ZnS quantum dots (QDs) decorated on single-layer graphene (SLG) demonstrates significantly enhanced probability of multiphoton emission, accompanied by reduced fluorescence intensity and decreased lifetime. A rigorous analysis of time-resolved spectroscopy on individual QDs on SLG reveals a decrease in radiative decay rate and a significant enhancement (12.6 times) in nonradiative decay rate. The enhanced multiphoton emission of QDs on SLG is a consequence of the competition between the enhanced nonradiative decay and fast Auger process, as suggested by the dominant fast decay (<0.8 ns) of QDs on SLG. Our findings provide important information on the emission behavior of QDs coupled with carbon nanomaterials, such as graphene and carbon nanotubes, and will assist in the creation of effective single-photon or multiphoton sources and devices. Furthermore, this is also a possible pathway for suppressing the Auger recombination of QDs while enhancing the generation of multicarriers, which has significant implications for light harvesting.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced Multiphoton Emission from CdTe/ZnS Quantum Dots Decorated on Single-Layer Graphene

Liu

Kumar

et al. 2015

J. Phys. Chem. C

View full text Add to dashboard Cite

show abstract

“…The enhancement of spontaneous emission rates can be described by the Purcell factor, which is proportional to the ratios between the cavity quality factor, Q , and mode volume, V ( F P ∝ Q / V ) . For conventional dielectric cavities, for example, a microdisk cavity or photonic crystal, they can provide a large quality factor, but the mode volume is restricted by the diffraction limit . In addition, their resonance band is extremely narrow and thus can only couple to a single emission frequency (for example, X or BX emission) with narrow spectral line width.…”

Section: Introductionmentioning

confidence: 99%

Modification of Fluorescence Properties in Single Colloidal Quantum Dots by Coupling to Plasmonic Gap Modes

et al. 2013

Self Cite

View full text Add to dashboard Cite

Efficient Auger relaxation in colloidal quantum dots (QDs) plays a crucial role in determining single-QD fluorescence behavior, for example, leading to fluorescence blinking and pure single-photon emission. Here, we demonstrate that when single-QD emission is coupled to a plasmonic gap mode, the fluorescence behavior is no longer dictated by nonradiative Auger relaxation, instead by radiative decay processes. In this case, annoying blinking can be largely suppressed accompanied by fluorescence enhancement. Moreover, the radiative decay rates for both exciton (X) and biexciton (BX) can be enhanced simultaneously owing to the broadband nature of a plasmonic gap mode with large Purcell effect. As a result, the BX quantum yields can be enhanced as high as that of single X emission which is derived from photon correlation measurement. This demonstration paves the way toward generating correlated photon pairs through BX–X cascade emission at room temperature based on cost-effective colloidal QDs.

show abstract

“…Q is the quality factor of the combined quantum dot-cavity system, given by Q = λ peak /( λ cav + λ QD ), where λ cav and λ QD are the homogeneous line widths of the cavity mode and the quantum dot emission, respectively [30,31]. In these room temperature experiments, λ cav ≈ 0.1 nm and λ QD ≈ 14 nm, so the relevant Q factor is approximately 45, determined by the exciton dephasing rate of the quantum dots.…”

mentioning

confidence: 99%

Controlling the emission from semiconductor quantum dots using ultra-small tunable optical microcavities

Jones

Dolan

et al. 2012

New J. Phys.

View full text Add to dashboard Cite

We report the control of spontaneous emission from CdSe/ZnS core-shell quantum dots coupled to novel open-access optical microcavities. The cavities are fabricated by focused ion beam milling and provide mode volumes less than a cubic micrometre. The quantum dot emission spectrum, spatial modes and lifetime are all modified substantially by the presence of the cavity, and can be tuned by actively varying the cavity length. An increase in emission rate of 75% is achieved at room temperature, attributed to the Purcell effect in the 'bad emitter' regime. We demonstrate a high degree of control over the emission from the dots, including near single-mode operation and the ability to detect strong emission from individual nanocrystals.

show abstract

Modification of spontaneous emission rates in single colloidal CdSe/ZnS quantum dots by a submicron-sized dielectric disk

Cited by 5 publications

References 28 publications

Enhanced Multiphoton Emission from CdTe/ZnS Quantum Dots Decorated on Single-Layer Graphene

Enhanced Multiphoton Emission from CdTe/ZnS Quantum Dots Decorated on Single-Layer Graphene

Modification of Fluorescence Properties in Single Colloidal Quantum Dots by Coupling to Plasmonic Gap Modes

Controlling the emission from semiconductor quantum dots using ultra-small tunable optical microcavities

Contact Info

Product

Resources

About