Undamped ultrafast pulsation of plasmonic fields via coherent exciton-plasmon coupling

Sadeghi, Seyed M.; Wing, Waylin J.; Gutha, Rithvik R.

doi:10.1088/0957-4484/26/8/085202

Cited by 36 publications

(20 citation statements)

References 36 publications

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“…The results of this paper offer novel en-abling processes that not only can improve current applications of QDs, but also can form the key ingredients of many other applications, ranging from quantum devices and computations, sensors, optical, and opto-electronics devices. [25][26][27][28][29][30] Note that this paper is related to our recent reports, demonstrating the impact of metal oxide plasmonic metafilms on emission QDs. [31,32] In these reports, thin films of Au combined with Si/Al oxide charge barriers were used to suppress the impact of the DEs of QDs.…”

Section: Introductionsupporting

confidence: 59%

Functional Metal-oxide Plasmonic Metastructures: Ultrabright Semiconductor Quantum Dots with Polarized Spontaneous Emission and Suppressed Auger Recombination

et al. 2019

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We use localized surface plasmon resonances in metallic nanoantennas to suppress defect environment of colloidal quantum dots and to enhance and polarize their spontaneous emission. For this we study the interaction of such quantum dots with functional metal-oxide plasmonic metastructures consisting of an Au/Si Schottky junction in close vicinity of a Si/Al oxide charge barrier. We show that optically excited quantum dots can couple with such metastructures via their electric dipole fields, offering super-plasmonic processes that include the impact of hot electron generation and fixed negative charges at the Si/Al oxide junction. For metallic nanoantennas with small aspect ratios our results show that these metastructures can reduce the defect-induced nonradiative decay rates of quantum dots such that their lifetime can become significantly longer than those in the absence of such nanoantennas. For metallic nanoantennas with larger aspect ratios these structures lead to ultrahigh enhancement of exciton-plasmon coupling, making the spontaneous emission of quantum dots strongly polarized while increasing their emission intensities by about 50 times. These results show by keeping excitons in the cores of quantum dots, the metastructures suppress migration of photo-excited electrons to surface defects and, therefore, reduce Auger recombination. Coherent dynamics associated with the quantum dot-induced exciton-plasmon coupling is theoretically investigated.

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Section: Introductionsupporting

confidence: 59%

Functional Metal-oxide Plasmonic Metastructures: Ultrabright Semiconductor Quantum Dots with Polarized Spontaneous Emission and Suppressed Auger Recombination

et al. 2019

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“…Fano resonances can extend the lifetime of plasmon excitations [18][19][20][21] which makes the operation of coherent plasmon emission (spaser) possible 22 . They also lead to further enhancement of the localized hot spot field 23 .…”

Section: Introductionmentioning

confidence: 99%

Silent enhancement of SERS signal without increasing hot spot intensities

et al. 2018

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Plasmonic nanostructures enhance nonlinear response, such as surface enhanced Raman scattering (SERS), by localizing the incident field into hot spots. The localized hot spot field can be enhanced even further when linear Fano resonances (FR) take place in a double resonance scheme. However, hot spot enhancement is limited with the modification of the vibrational modes, the break-down of the molecule and the tunnelling regime. Here, we present a method which can circumvent these limitations. Our analytical model and solutions of 3D Maxwell equations show that: enhancement due to the localized field can be multiplied by a factor of 10 2 to 10 3 . Moreover, this can be performed without increasing the hot spot intensity which also avoids the modification of the Raman modes. Unlike linear Fano resonances, we create a path interference in the nonlinear response. We demonstrate on a single equation that enhancement takes place due to cancellation of the contributing terms in the denominator of the SERS response.arXiv:1709.09230v3 [physics.optics]

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“…25,26 Moreover, hybrid systems consisting of QDs and NRs can offer new physics for sensing based on quantum effects, 27,28 and creation of novel quantum devices. 29 …”

Section: Introductionmentioning

confidence: 99%

Biological sensing and control of emission dynamics of quantum dot bioconjugates using arrays of long metallic nanorods

Sadeghi¹,

Gutha²,

Wing³

et al. 2017

J. Phys. D: Appl. Phys.

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We study biological sensing using plasmonic and photonic-plasmonic resonances of arrays of ultralong metallic nanorods and analyze the impact of these resonances on emission dynamics of quantum dot bioconjugates. We demonstrate that the LSPRs and plasmonic lattice modes of such array can be used to detect a single self-assembled monolayer of alkanethiol at the visible (550 nm) and near infrared (770 nm) range with well resolved shifts. We study adsorption of streptavidin-quantum dot conjugates to this monolayer, demonstrating that formation of nearly two dimensional arrays of quantum dots with limited emission blinking can lead to extra well-defined wavelength shifts in these modes. Using spectrally-resolved lifetime measurements we study the emission dynamics of such quantum dot bioconjugates within their monodispersed size distribution. We show that, despite their close vicinity to the nanorods, the rate of energy transfer from these quantum dots to nanorods is rather weak, while the plasmon field enhancement can be strong. Our results reveal that the nanorods present a strongly wavelength or size-dependent non-radiative decay channel to the quantum dot bioconjugates.

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Undamped ultrafast pulsation of plasmonic fields via coherent exciton-plasmon coupling

Cited by 36 publications

References 36 publications

Functional Metal-oxide Plasmonic Metastructures: Ultrabright Semiconductor Quantum Dots with Polarized Spontaneous Emission and Suppressed Auger Recombination

Functional Metal-oxide Plasmonic Metastructures: Ultrabright Semiconductor Quantum Dots with Polarized Spontaneous Emission and Suppressed Auger Recombination

Silent enhancement of SERS signal without increasing hot spot intensities

Biological sensing and control of emission dynamics of quantum dot bioconjugates using arrays of long metallic nanorods

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