Carrier density dependence of plasmon-enhanced nonradiative energy transfer in a hybrid quantum well-quantum dot structure

Higgins, Luke J.; Karanikolas, Vasilios; Marocico, Cristian A.; Bell, Alan P.; Sadler, Thomas C.; Parbrook, P. J.; Bradley, A. Louise

doi:10.1364/oe.23.001377

Cited by 12 publications

(11 citation statements)

References 43 publications

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“…The optical interactions between light and matter in the presence of metal nanoparticles (NPs) is a topic of great interest, both from the point of view of a fundamental understanding of these interactions, as well as their potential applications for solar cells, [1][2][3][4] light-emitting diodes, [5][6][7][8] subwavelength imaging, 9,10 bio-sensing, [11][12][13][14][15][16][17] etc. Of particular importance is the influence that the localized surface plasmon (LSP) excited at the surface of noble metal NPs has on the optical interactions of quantum systems.…”

Section: Introductionmentioning

confidence: 99%

A theoretical investigation of the influence of gold nanosphere size on the decay and energy transfer rates and efficiencies of quantum emitters

Marocico

Zhang

Bradley

2016

The Journal of Chemical Physics

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Articles you may be interested inWe present in this contribution a comprehensive investigation of the effect of the size of gold nanospheres on the decay and energy transfer rates of quantum systems placed close to these nanospheres. These phenomena have been investigated before, theoretically and experimentally, but no comprehensive study of the influence of the nanoparticle size on important dependences of the decay and energy transfer rates, such as the dependence on the donor-acceptor spectral overlap and the relative positions of the donor, acceptor, and nanoparticle, exists. As such, different accounts of the energy transfer mechanism have been presented in the literature. We perform an investigation of the energy transfer mechanisms between emitters and gold nanospheres and between donor-acceptor pairs in the presence of the gold nanospheres using a Green's tensor formalism, experimentally verified in our lab. We find that the energy transfer rate to small nanospheres is greatly enhanced, leading to a strong quenching of the emission of the emitter. When the nanosphere size is increased, it acts as an antenna, increasing the emission of the emitter. We also investigate the emission wavelength and intrinsic quantum yield dependence of the energy transfer to the nanosphere. As evidenced from the literature, the energy transfer process between the quantum system and the nanosphere can have a complicated distance dependence, with a r −6 regime, characteristic of the Förster energy transfer mechanism, but also exhibiting other distance dependences. In the case of a donor-acceptor pair of quantum systems in the presence of a gold nanosphere, when the donor couples strongly to the nanosphere, acting as an enhanced dipole; the donor-acceptor energy transfer rate then follows a Förster trend, with an increased Förster radius. The coupling of the acceptor to the nanosphere has a different distance dependence. The angular dependence of the energy transfer efficiency between donor and acceptor exhibits a strong focusing effect and the same enhanced donor-dipole character in different angular arrangements. The spectral overlap of the donor emission and acceptor absorption spectra shows that the energy transfer follows the near-field scattering efficiency, with a red-shift from the localized surface plasmon peak for small sphere sizes. C 2016 AIP Publishing LLC. [http://dx

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Section: Introductionmentioning

confidence: 99%

A theoretical investigation of the influence of gold nanosphere size on the decay and energy transfer rates and efficiencies of quantum emitters

Marocico

Zhang

Bradley

2016

The Journal of Chemical Physics

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“…The carrier density dependence of plasmon-enhanced FRET has been previously reported. 63 After the deposition of the QD layer on the QW, in the absence of the arrays, there is no measurable effect on the QW lifetime, shown in Figure S5 (b). This demonstrates that there is no significant direct FRET from the QW to the QDs away from the arrays.…”

Section: Resultsmentioning

confidence: 99%

Influence of plasmonic array geometry on energy transfer from a quantum well to a quantum dot layer

et al. 2016

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A range of seven different Ag plasmonic arrays formed using nanostructures of varying shape, size and gap were fabricated using helium-ion lithography (HIL) on an InGaN/GaN quantum well (QW) substrate. The influence of the array geometry on plasmon-enhanced Förster resonance energy transfer (FRET) from a single InGaN QW to a ∼80 nm layer of CdSe/ZnS quantum dots (QDs) embedded in a poly(methyl methacrylate) (PMMA) matrix is investigated. It is shown that the energy transfer efficiency is strongly dependent on the array properties and an efficiency of ∼51% is observed for a nanoring array. There were no signatures of FRET in the absence of the arrays. The QD acceptor layer emission is highly sensitive to the array geometry. A model was developed to confirm that the increase in the QD emission on the QW substrate compared with a GaN substrate can be attributed solely to plasmon-enhanced FRET. The individual contributions of direct enhancement of the QD layer emission by the array and the plasmon-enhanced FRET are separated out, with the QD emission described by the product of an array emission factor and an energy transfer factor. It is shown that while the nanoring geometry results in an energy transfer factor of ∼1.7 the competing quenching by the array, with an array emission factor of ∼0.7, results in only an overall gain of ∼14% in the QD emission. The QD emission was enhanced by ∼71% for a nanobox array, resulting from the combination of a more modest energy transfer factor of 1.2 coupled with an array emission factor of ∼1.4.

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“…The capacity of the beads to co-deliver multiple incompatible drugs is evaluated using QDs as a model. QDs are tiny nanocrystals of a semiconducting material. − Their fluorescence emission is easily quenched by different chemical agents including metal ions, − carbon nanotubes, and organic dyes . This property may not be favorable for imaging applications, but has made QDs an excellent model to demonstrate the capacity of our MC beads to co-deliver incompatible drugs.…”

Section: Resultsmentioning

confidence: 99%

Multicompartment Microgel Beads for Co-Delivery of Multiple Drugs at Individual Release Rates

Lai

Susha

Rogach

2015

ACS Appl. Mater. Interfaces

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Multidrug therapy may yield higher therapeutic effects as compared to monotherapy, yet its wide application has been hampered by the limitations of conventional drug delivery systems, in which not only incompatible drugs cannot be co-delivered but also the release rates of individual co-delivered drugs cannot be tuned separately. Regarding these limitations, we adopt the microfluidic electrospray technology to fabricate alginate-based multicompartment microgel beads. By using cadmium-telluride (CdTe) quantum dots (QDs) and a quenching agent as a model pair, the beads are shown to effectively separate incompatible drugs during co-delivery, and significantly prolong the time of observable fluorescence emission from QDs co-delivered with a quenching agent. Moreover, the drug release rates from different compartments can be tuned using the polymer blending technique to achieve a variety of drug release patterns. This study is one of the first to adopt the microfluidic electrospray technology to generate microgel beads with such versatility for co-delivery of multiple drugs. Our results provide evidence for the promising potential of our beads to be further developed as a carrier for multidrug therapy and other applications that require co-administration of multiple bioactive agents.

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Carrier density dependence of plasmon-enhanced nonradiative energy transfer in a hybrid quantum well-quantum dot structure

Cited by 12 publications

References 43 publications

A theoretical investigation of the influence of gold nanosphere size on the decay and energy transfer rates and efficiencies of quantum emitters

A theoretical investigation of the influence of gold nanosphere size on the decay and energy transfer rates and efficiencies of quantum emitters

Influence of plasmonic array geometry on energy transfer from a quantum well to a quantum dot layer

Multicompartment Microgel Beads for Co-Delivery of Multiple Drugs at Individual Release Rates

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