Plasmon Emission Quantum Yield of Single Gold Nanorods as a Function of Aspect Ratio

Fang, Ying; Chang, Wei-Shun; Willingham, Britain A.; Swanglap, Pattanawit; Domínguez-Medina, Sergio; Link, Stephan

doi:10.1021/nn3022469

Cited by 183 publications

(293 citation statements)

References 47 publications

(82 reference statements)

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“…The similarity of the optical absorption and light emission spectra of AuNR has been noted before (12,17,19,20) and is typically attributed to light emission associated with the plasmon resonance of the AuNR (19,20). The proposed mechanisms of the luminescence involve (i) the creation of energetic electronhole pairs by the 488-nm photon; (ii) the relaxation of these electron-hole pairs by excitation of the collective longitudinal plasmon; (iii) radiative decay of the longitudinal plasmon by emission of near infrared photons.…”

Section: Resultssupporting

confidence: 76%

“…Because the plasmon resonance is fixed by the geometry of the AuNR, a change in the excitation wavelength will not change the peak position. Further support for this description comes from prior studies (12,17,19,20) which used varying excitation wavelengths and found that the emission peak of AuNRs overlapped with the optical absorption or dark-field scattering peak.…”

Section: Resultsmentioning

confidence: 83%

“…The benefit of two-photon excitation is an improvement of the spatial resolution over what can typically be achieved by confocal fluorescence imaging. Proposed mechanisms for luminescence from Au or Ag nanostructures include fluorescence by interband transitions (7,(11)(12)(13)(14)(15)(16), intraband transitions (17), and radiative decay of surface plasmons (18)(19)(20)(21).…”

mentioning

confidence: 99%

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Resonant secondary light emission from plasmonic Au nanostructures at high electron temperatures created by pulsed-laser excitation

Huang¹,

Wang

Murphy³

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

139

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Plasmonic nanostructures are of great current interest as chemical sensors, in vivo imaging agents, and for photothermal therapeutics. We study continuous-wave (cw) and pulsed-laser excitation of aqueous suspensions of Au nanorods as a model system for secondary light emission from plasmonic nanostructures. Resonant secondary emission contributes significantly to the background commonly observed in surface-enhanced Raman scattering and to the light emission generated by pulsed-laser excitation of metallic nanostructures that is often attributed to two-photon luminescence. Spectra collected using cw laser excitation at 488 nm show an enhancement of the broad spectrum of emission at the electromagnetic plasmon resonance of the nanorods. The intensity of anti-Stokes emission collected using cw laser excitation at 785 nm is described by a 300 K thermal distribution of excitations. Excitation by subpicosecond laser pulses at 785 nm broadens and increases the intensity of the anti-Stokes emission in a manner that is consistent with electronic Raman scattering by a high-temperature distribution of electronic excitations predicted by a two-temperature model. Broadening of the pulse duration using an etalon reduces the intensity of anti-Stokes emission in quantitative agreement with the model. Experiments using a pair of subpicosecond optical pulses separated by a variable delay show that the timescale of resonant secondary emission is comparable to the timescale for equilibration of electrons and phonons.gold nanorods | electron-hole pairs | surface-enhanced Raman scattering background

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Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 83%

mentioning

confidence: 99%

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Resonant secondary light emission from plasmonic Au nanostructures at high electron temperatures created by pulsed-laser excitation

Huang¹,

Wang

Murphy³

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

139

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“…Note that in a lossy medium, e.g. in metals, the bare γ 0 21 will be dominated by nonradiative processes, 81,82 leading to small quantum yields (QY) γ r,0 21 /γ 0 21 ≪ 1. Note also that technically, the calculation of the Purcell factor requires integration over the gain bandwidth,…”

Section: Depend On the Corresponding Macroscopic Gain Profilementioning

confidence: 99%

Amplified and directional spontaneous emission from arbitrary composite bodies: A self-consistent treatment of Purcell effect below threshold

et al. 2016

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We study amplified spontaneous emission (ASE) from wavelength-scale composite bodies-complicated arrangements of active and passive media-demonstrating highly directional and tunable radiation patterns, depending strongly on pump conditions, materials, and object shapes. For instance, we show that under large enough gain, PT symmetric dielectric spheres radiate mostly along either active or passive regions, depending on the gain distribution. Our predictions are based on a recently proposed fluctuating volume-current (FVC) formulation of electromagnetic radiation that can handle inhomogeneities in the dielectric and fluctuation statistics of active media, e.g. arising from the presence of non-uniform pump or material properties, which we exploit to demonstrate an approach to modelling ASE in regimes where Purcell effect (PE) has a significant impact on the gain, leading to spatial dispersion and/or changes in power requirements. The nonlinear feedback of PE on the active medium, captured by the Maxwell-Bloch equations but often ignored in linear formulations of ASE, is introduced into our linear framework by a self-consistent renormalization of the (dressed) gain parameters, requiring the solution of a large system of nonlinear equations involving many linear scattering calculations.Noise in structures comprising passive and active materials can lead to important radiative effects, 1 e.g. spontaneous emission (SE), 2 superluminescence, 3 and fluorescence. 4 Although large-etalon gain amplifiers and related devices have been studied for decades, [5][6][7][8] there is increased interest in the design of wavelength-scale composites for tunable sources of scattering and incoherent emission, 9,10 or which serve as perfect absorbers 11 at mid-infrared and visible wavelengths. In this paper, we extend a recently developed fluctuatingvolume current (FVC) formulation of electromagnetic (EM) fluctuations [12][13][14][15] to the problem of modeling spontaneous emission and scattering from composite, wavelength-scale structures, e.g. metal-dielectric spasers, [16][17][18] subject to inhomogeneities in both material and noise properties. We begin by studying amplified spontaneous emission (ASE) from piecewise-constant composite bodies, showing that their emissivity can exhibit a high degree of directionality, depending sensitively on the gain profile and shape of the objects. For instance, we find that under large enough gain, the directivity of parity-time (PT ) symmetric spheres can be designed to lie primarily along active or passive regions, depending on the presence or absence of centrosymmetry, respectively. Such composite micron-scale emitters act as tunable sources of incoherent radiation, forming a special class of infrared/visible antennas exhibiting polarization-and direction-sensitive absorption and emission properties. An important ingredient for the design of directional emission is the ability to tune the gain profile of the objects, which can be far from homogeneous in realistic settings. Here, we consider tw...

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“…Owing to the strong coupling between the excited electron-hole pairs and the LSPRs, the position and shape of the plasmon-enhanced PL spectra have been demonstrated to be modulated by the LSPRs. 11,14,[21][22][23][24] However, LSPRs supported by those gold nanostructures usually exhibit low quality factors, 7,14,21 and consequently, only the reshaped PL spectra with broad linewidths are observed. In this work, we investigate the PL generated from the gold nanoshells of the dielectric-metal core-shell resonators (DMCSRs).…”

Section: Introductionmentioning

confidence: 99%

Shaping the photoluminescence from gold nanoshells by cavity plasmons in dielectric-metal core-shell resonators

Sun

Wan

et al. 2016

AIP Advances

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We report experimental investigation of the photoluminescence (PL) generated from the gold nanoshells of the dielectric-metal core-shell resonators (DMCSR) that support multipolar electric and magnetic based cavity plasmon resonances. Significantly enhanced and modulated PL spectrum is observed. By comparing the experimental results with analytical Mie calculations, we are able to demonstrate that the observed reshaping effects are due to the excitations of those narrow-band cavity plasmon resonances. We also present that the variation on the dielectric core size allows for tuning the cavity plasmon resonance wavelengths and thus the peak positions of the PL spectrum.

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Plasmon Emission Quantum Yield of Single Gold Nanorods as a Function of Aspect Ratio

Cited by 183 publications

References 47 publications

Resonant secondary light emission from plasmonic Au nanostructures at high electron temperatures created by pulsed-laser excitation

Resonant secondary light emission from plasmonic Au nanostructures at high electron temperatures created by pulsed-laser excitation

Amplified and directional spontaneous emission from arbitrary composite bodies: A self-consistent treatment of Purcell effect below threshold

Shaping the photoluminescence from gold nanoshells by cavity plasmons in dielectric-metal core-shell resonators

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