High-Q resonance modes observed in a metallic nanocavity

Takemoto, R.; Ishihara, Nagisa; Kurosawa, Hiroyuki; Jahan, Nusrat; Asano, Taku; Liu, X.; Nakajima, Hirochika; Kumano, H.; Suemune, I.

doi:10.1063/1.4828351

Cited by 5 publications

(6 citation statements)

References 22 publications

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“…To further improve both the source brightness and the photon indistinguishability, we could employ metallic nanocavities, in which the QD line can be coupled to the cavity mode. 41 …”

Section: Discussionmentioning

confidence: 97%

Two-photon interference and coherent control of single InAs quantum dot emissions in an Ag-embedded structure

Liu

Kumano

Nakajima

et al. 2014

Journal of Applied Physics

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We have recently reported the successful fabrication of bright single-photon sources based on Ag-embedded nanocone structures that incorporate InAs quantum dots. The source had a photon collection efficiency as high as 24.6%. Here, we show the results of various types of photonic characterizations of the Ag-embedded nanocone structures that confirm their versatility as regards a broad range of quantum optical applications. We measure the first-order autocorrelation function to evaluate the coherence time of emitted photons, and the second-order correlation function, which reveals the strong suppression of multiple photon generation. The high indistinguishability of emitted photons is shown by the Hong-Ou-Mandel-type two-photon interference. With quasi-resonant excitation, coherent population flopping is demonstrated through Rabi oscillations. Extremely high single-photon purity with a g((2))(0) value of 0.008 is achieved with pi-pulse quasi-resonant excitation

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“…To further improve both the source brightness and the photon indistinguishability, we could employ metallic nanocavities, in which the QD line can be coupled to the cavity mode. 41 …”

Section: Discussionmentioning

confidence: 97%

Two-photon interference and coherent control of single InAs quantum dot emissions in an Ag-embedded structure

Liu

Kumano

Nakajima

et al. 2014

Journal of Applied Physics

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“…Si is amphoteric in GaAs and Si Ga -Si As donor-acceptor-pair (DAP) emission has been recognized at ~1.49 eV (wavelength of 832 nm) with low doping concentration of ~10 15 cm -3 [20,21]. With heavy doping up to 10 18~1 0 19 cm -3 , deep emission around 1.24 eV (1000 nm) was observed and was assigned to Si Ga -V Ga complex [22]. However, the deep emission was later discussed from the viewpoint of Si Ga -Si As DAP emission [23].…”

Section: Sub-bandgap Emission In Doped Gaasmentioning

confidence: 99%

Subwavelength metallic cavities with high-Qresonance modes

Ishihara¹,

Kurosawa²,

Takemoto³

et al. 2015

Nanotechnology

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Metallic cavities have been extensively studied to realize small-volume nanocavities and nanolasers. However cavity-resonance quality (Q) factors of nanolasers observed up to now remain low (up to ~500) due to metal optical absorption. In this paper, we report the observation of highest Q factors of 9000 at low temperature and ~6000 near room temperature in a metallic cavity with a probe of sub-bandgap emission of Si-doped GaAs. We analyze the temperature dependence of cavity-mode resonance wavelengths and show that the refractive-index term dominates the measured temperature dependence. We also show that this refractive-index term is cavity-mode dependent and the fitting procedure offers a new method to identify cavity modes. We simulate the metallic cavity with finite-element method and attribute the high-Q cavity mode to a whispering gallery optical mode. This mode is shown to have isotropic polarization dependence of the output emission, which is preferable for quantum information applications.2

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“…Metal-coated microcavities especially attract considerable attention because the surface plasmon polaritons (SPPs) supported by these photonic devices can highly concentrate and channel light substantially smaller than wavelengths [3][4][5]. However, even the best available plasmonic materials, such as silver and gold, are hardly tunable and display enormous ohmic losses in the frequency regimes of interest, which limit their applicability to optical devices.…”

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confidence: 99%

Investigation of plasmonic whispering-gallery mode characteristics for graphene monolayer coated dielectric nanodisks

et al. 2014

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In this Letter, we theoretically studied high-quality (Q) factor plasmonic whispering-gallery modes (WGMs) with ultrasmall mode volumes in graphene monolayer coated semiconductor nanodisks in the mid-infrared range. The influence of the chemical potential, the relaxation time of graphene, and the radius of the nanodisk on the cavity Q factor and the mode volume was numerically investigated. The numerical simulations showed that the plasmonic WGMs excited in this cavity had a deep subwavelength mode volume of 1.4×10(-5)(λ(0)/2n)(3), a cavity Q factor as high as 266 at a temperature lower than 250 K, and, consequently, a large Purcell factor of ∼1.2×10(7) when the chemical potential and relaxation time were assumed to be 0.9 eV and 1.4 ps, respectively. The results provide a possible application of plasmonic WGMs in the integration of nano-optoelectronic devices based on graphene.

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High-Q resonance modes observed in a metallic nanocavity

Cited by 5 publications

References 22 publications

Two-photon interference and coherent control of single InAs quantum dot emissions in an Ag-embedded structure

Two-photon interference and coherent control of single InAs quantum dot emissions in an Ag-embedded structure

Subwavelength metallic cavities with high-Qresonance modes

Investigation of plasmonic whispering-gallery mode characteristics for graphene monolayer coated dielectric nanodisks

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