Large spontaneous emission enhancement in plasmonic nanocavities

Russell, Kasey J.; Liu, Tsung-Li; Cui, Shanying; Hu, Evelyn L.

doi:10.1038/nphoton.2012.112

Cited by 392 publications

(389 citation statements)

References 21 publications

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“…In contrast to previous work investigating PL enhancement in single nanoparticles and nanoantennas 3,40,41 or in Fano-type 30,42,43 and hyperbolic metamaterials 31,32 , our SRR metamaterial supports both electric and magnetic modes that are spectrally matched to the emission of semiconductor QDs at around l QD ¼ 800 nm wavelength. Since both modes in our metamaterial can be engineered independently from each other, our QD metamaterial offers new opportunities to tailor the spontaneous emission of quantum emitters into two independent radiative decay channels.…”

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confidence: 65%

“…3a,b show that for y-polarized detection (magnetic mode) the PL-enhancement factors are on average B1.5; however, there are spatial positions where enhancement of up to approximately three can be observed. This is a notable enhancement given that, in contrast to single plasmonic structures 3,40,49 where a precise placement of the emitters is possible 40,41,50 , large PLenhancement factors are harder to realize in metamaterials since, here, the main focus is on the spatially averaged effective response of the coupled QD metamaterial. For this reason, in our experiments and numerical simulations, we average over all possible distances, lateral positions and dipole orientations of the QDs with regard to the split-ring-resonator meta-atom.…”

Section: Resultsmentioning

confidence: 99%

“…T he control of spontaneous emission in photonic structures relies on enhanced light-matter interactions because of field localization and large interaction times [1][2][3] . As such, nanostructured plasmonic materials are well suited for this purpose because they offer strong field confinement and can be engineered to support good coupling to free space, thereby opening up a way towards applications such as quantum information devices 4,5 , solar-energy harvesting 6 , efficient photodetection 7,8 and biological markers 9 .…”

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Dual-channel spontaneous emission of quantum dots in magnetic metamaterials

et al. 2013

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Metamaterials, artificial electromagnetic media realized by subwavelength nano-structuring, have become a paradigm for engineering electromagnetic space, allowing for independent control of both electric and magnetic responses of the material. Whereas most metamaterials studied so far are limited to passive structures, the need for active metamaterials is rapidly growing. However, the fundamental question on how the energy of emitters is distributed between both (electric and magnetic) interaction channels of the metamaterial still remains open. Here we study simultaneous spontaneous emission of quantum dots into both of these channels and define the control parameters for tailoring the quantum-dot coupling to metamaterials. By superimposing two orthogonal modes of equal strength at the wavelength of quantum-dot photoluminescence, we demonstrate a sharp difference in their interaction with the magnetic and electric metamaterial modes. Our observations reveal the importance of mode engineering for spontaneous emission control in metamaterials, paving a way towards loss-compensated metamaterials and metamaterial nanolasers.

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confidence: 65%

Section: Resultsmentioning

confidence: 99%

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Dual-channel spontaneous emission of quantum dots in magnetic metamaterials

et al. 2013

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“…Modification of the spontaneous emission rate of a quantum emitter induced by its environment, known as the Purcell effect [17,18], is not so pronounced in alldielectric structures [2,19], as in microcavities [20] or plasmonic nanoantennas [21,22]. This is due to the fact that optical resonances of high-index nanoparticles are characterized by relatively low quality factors and large mode volumes, which results in low efficiency of light-matter interaction.…”

Section: Introductionmentioning

confidence: 99%

All-Optical Switching and Unidirectional Plasmon Launching with Nonlinear Dielectric Nanoantennas

Krasnok

Lepeshov

et al. 2018

Phys. Rev. Applied

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High-index dielectric nanoparticles have become a powerful platform for modern light science, enabling various fascinating applications, especially in nonlinear nanophotonics for which they enable special types of optical nonlinearity, such as electron-hole plasma photoexcitation, which are not inherent to plasmonic nanostructures. Here, we propose a novel geometry for highly tunable alldielectric nanoantennas, consisting of a chain of silicon nanoparticles excited by an electric dipole source, which allows tuning their radiation properties via electron-hole plasma photoexcitation. We show that the slowly guided modes determining the Van Hove singularity of the nanoantenna are very sensitive to the nanoparticle permittivity, opening up the ability to utilize this effect for efficient all-optical modulation. We show that by pumping several boundary nanoparticles with relatively low intensities may cause dramatic variations in the nanoantenna radiation power patterns and Purcell factor. We also demonstrate that ultrafast pumping of the designed nanoantenna allows unidirectional launching of surface plasmon-polaritons, with interesting implications for modern nonlinear nanophotonics.

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“…1,2 These nano-plasmonic devices have a wide variety of applications in systems that rely on strong optical fields, such as surface-enhanced Raman scattering, 3,4 nanoscale nonlinear optics, [5][6][7] optical tweezing, 8,9 fluorescence enhancement, 10 and large Purcell enhancement of quantum emitters. 11,12 Plasmonic field enhancement becomes much stronger as the gap size is reduced to nanometer scale. This effect has been demonstrated in various applications: Purcell enhancements larger than 1000 were achieved using silver nanowires or nanocubes on metal films with spacing of 5-15 nm; 11,12 surface-enhanced Raman scattering increases by orders of magnitude when the gap of gold dimers decreases; 4 and optical trapping simulations show that tapered 5-nm gap coaxial apertures could trap 2-nm dielectric particle with reasonable laser powers.…”

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confidence: 99%