Near-field images of a monolayer of periodically arrayed dielectric spheres

Miyazaki, Hiroshi; Ohtaka, K.

doi:10.1103/physrevb.58.6920

Cited by 79 publications

(59 citation statements)

References 26 publications

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“…Already in the low-frequency limit, a / = 0.4, there is a spatial variation of the radiative rate ͑⌬␥ ജ 0͒ because the QDs distributed over inequivalent positions in the unit cell couple to different electric fields. 25 At the frequencies of the L-gap, a / Ϸ 0.7, the radiative rate ␥ rad is inhibited in most places in the unit cell that are occupied by the QDs, as confirmed by a low continuous-wave ͑cw͒ count rate of only Ϸ2.5 kHz. Therefore, the observed narrow width ⌬␥ = 0.1 ns −1 is a measure of the distribution width of nonradiative rates.…”

Section: Resultsmentioning

confidence: 98%

Strongly nonexponential time-resolved fluorescence of quantum-dot ensembles in three-dimensional photonic crystals

et al. 2007

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We observe experimentally that ensembles of quantum dots in three-dimensional (3D) photonic crystals reveal strongly nonexponential time-resolved emission. These complex emission decay curves are analyzed with a continuous distribution of decay rates. The log-normal distribution describes the decays well for all studied lattice parameters. The distribution width is identified with variations of the radiative emission rates of quantum dots with various positions and dipole orientations in the unit cell. We find a striking sixfold change of the width of the distribution by varying the lattice parameter. This interpretation qualitatively agrees with the calculations of the 3D projected local density of states. We therefore conclude that fluorescence decay of ensembles of quantum dots is highly nonexponential to an extent that is controlled by photonic crystals.

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Section: Resultsmentioning

confidence: 98%

Strongly nonexponential time-resolved fluorescence of quantum-dot ensembles in three-dimensional photonic crystals

et al. 2007

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“…The fact that the PBG in the far-field transmission corresponds to the peak in the emission intensity spectrum correlates the theoretical findings about the similarity of spectral features of 2D PhCs in the far and near fields. 36 It should be emphasized that the PBG-related suppression of the emission intensity of PhC-embedded light sources is fundamentally different from the PBG emission control described in this paper. The dissimilarity relates to the different realizations of the coupling of a light source to a PhC.…”

Section: Discussionmentioning

confidence: 99%

“…It has been shown that the resonance enhances the intensity of a local field by two orders of magnitude if the monolayer of spheres is suspended in the air, whereas the attached substrate reduces the enhancement by factor of 10. 6,7,35 The distribution of the local field at the surface of the opal-based PhC in the PBG wavelength range was modeled theoretically 36 and visualized by the near-field optical microscopy. 9 Since the near-field amplitude of evanescent waves decays rapidly away from a PhC surface on a scale of the PhC lattice constant, the NCF-based emitter should be in close proximity to a PhC surface.…”

Section: Discussionmentioning

confidence: 99%

Modification of emission of CdTe nanocrystals by the local field of Langmuir–Blodgett colloidal photonic crystals

Romanov¹,

Bardosova

Povey

et al. 2008

Journal of Applied Physics

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A light source on the surface of a slab of 2+1-dimensional photonic crystal has been prepared by the Langmuir–Blodgett deposition of a colloidal crystal on top of a thin film containing CdTe nanocrystals. The directional enhancement of the light emission intensity in the spectral range of the photonic bandgap has been revealed through the comparative examination of the angle-resolved transmission, diffraction, and photoluminescence spectra of the prepared structures. Changes in the emission spectrum have been tentatively explained in terms of the acceleration of the radiative recombination due to the increase in the local field strength at photonic bandgap resonance and changes in the emission diagram—as arising from the wavelength dependence of the topology of the local field pattern.

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“…Scattering of plane waves by periodic two-dimensional arrays of dielectric spheres originates since pioneering papers by Ohtaka et al [3,4] (see also Ref. [5]).…”

Section: Emergence Of the Bsc In Scatteringmentioning

confidence: 99%

“…The overwhelming majority of papers since the pioneering papers by Ohtaka and his coauthors [2][3][4] considered the periodical two-and three-dimensional arrays [5][6][7][8]. Surprisingly, less interest has been payed to scattering by a linear array of dielectric nanoparticles mostly restricted to aggregates of a finite number of spheres [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Light Trapping above the Light Cone in One-Dimensional Arrays of Dielectric Spheres

2017

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Abstract:We demonstrate bound states in the radiation continuum (BSC) in a linear periodic array of dielectric spheres in air above the light cone. We classify the BSCs by orbital angular momentum m = 0, ±1, ±2 according to the rotational symmetry of the array, Bloch wave vector β directed along the array according to the translational symmetry, and polarization. The most simple symmetry protected BSCs have m = 0, β = 0 and occur in a wide range of the radius of the spheres and dielectric constant. More sophisticated BSCs with m = 0, β = 0 exist only for a selected radius of spheres at fixed dielectric constant. We also find robust Bloch BSCs with β = 0, m = 0. All BSCs reside within the first but below the other diffraction continua. We show that the BSCs can be easily detected by bright features in scattering of different plane waves by the array as dependent on type of the BSC. The symmetry protected TE/TM BSCs can be traced by collapsing Fano resonance in cross-sections of normally incident TE/TM plane waves. When plane wave with circular polarization with frequency tuned to the bound states with OAM illuminates the array the spin angular momentum of the incident wave transfers into the orbital angular momentum of the BSC. This, in turn, gives rise to giant vortical power currents rotating around the array. Incident wave with linear polarization with frequency tuned to the Bloch bound state in the continuum induces giant laminar power currents. At last, the plane wave with linear polarization incident under tilt relative to the axis of array excites Poynting currents spiralling around the array. It is demonstrated numerically that quasi-bound leaky modes of the array can propagate both stationary waves and light pulses to a distance of 60 wavelengths at the frequencies close to the bound states in the radiation continuum. A semi-analytical estimate for decay rates of the guided waves is found to match the numerical data to a good accuracy.

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Near-field images of a monolayer of periodically arrayed dielectric spheres

Cited by 79 publications

References 26 publications

Strongly nonexponential time-resolved fluorescence of quantum-dot ensembles in three-dimensional photonic crystals

Strongly nonexponential time-resolved fluorescence of quantum-dot ensembles in three-dimensional photonic crystals

Modification of emission of CdTe nanocrystals by the local field of Langmuir–Blodgett colloidal photonic crystals

Light Trapping above the Light Cone in One-Dimensional Arrays of Dielectric Spheres

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