Light emission by magnetic and electric dipoles close to a plane interface I Total radiated power

Lukosz, W.; Kunz, Ralf

doi:10.1364/josa.67.001607

Cited by 441 publications

(320 citation statements)

References 15 publications

Supporting

Mentioning

312

Contrasting

Order By: Relevance

“…Because of their pure dipolar character the resulting asymmetry in the angular pattern is smaller than for the larger disks. For the D ¼ 50 nm disk a toroidal 'doughnut' shaped pattern is observed, consistent with the emission pattern of a vertically oriented point dipole source (so a pure p z contribution) 49,50 . This is consistent with the spatial profile in Fig.…”

supporting

confidence: 76%

See 1 more Smart Citation

Directional emission from a single plasmonic scatterer

et al. 2014

View full text Add to dashboard Cite

Directing light emission is key for many applications in photonics and biology. Optical antennas made from nanostructured plasmonic metals are suitable candidates for this purpose but designing antennas with good directional characteristics can be challenging, especially when they consist of multiple elements. Here we show that strongly directional emission can also be obtained from a simple individual gold nanodisk, utilizing the far-field interference of resonant electric and magnetic modes. Using angle-resolved cathodoluminescence spectroscopy, we find that the spectral and angular response strongly depends on excitation position. For excitation at the nanodisk edge, interference between in-plane and out-of-plane dipole components leads to strong beaming of light. For large nanodisks, higher-order multipole components contribute significantly to the scattered field, leading to enhanced directionality. Using a combination of full-wave simulations and analytical point scattering theory we are able to decompose the calculated and measured scattered fields into dipolar and quadrupolar contributions.

show abstract

supporting

confidence: 76%

“…5. These are calculated using asymptotic far-field approximations for dipoles and quadrupoles in the presence of a substrate [49][50][51] . Both electrical dipole components p z and p x show the characteristic toroid shapes centred around the dipole axis.…”

mentioning

confidence: 99%

Directional emission from a single plasmonic scatterer

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Lukosz and Kunz [7] have considered the situation in which a dipole is perpendicular to the interface. Figure 11 shows the angular distribution of emitted power for dipoles located at the interface in the low refractive index medium.…”

Section: Directions Of Emissionmentioning

confidence: 99%

“…The rate of spontaneous emission of a dipole is not an intrinsic property of the dipole but depends on its environment [1]: dielectric medium [2][3][4][5], dielectric interface [6][7][8], metallic interface [9,10] or cavity [11]. The modification of the emission rate of a dipole has been studied theoretically for many years.…”

Section: Introductionmentioning

confidence: 99%

Light Emission by Semiconductor Nanostructures in Dielectric Medium or Close to Plane Interface

Lavallard

1996

Acta Phys. Pol. A

View full text Add to dashboard Cite

We review several situations in which the emission rate of a nanostructure is modified by its environment. We first consider smaJl objects embedded in media with different refractive indices. The local electromagnetic field and the rate of spontaneous emission of the nanostructure are enhanced or inhibited by the induced dipole charges on the interface. In quantum wells or nanocrystals embedded in a low dielectric constant medium, the binding energy of excitons is increased. In anisotropic microcrystals, the local field is anisotropic and emission of light is polarized. We consider especially the case of p+-doped porous silicon in which nanocrystals are elongated. Another interesting situation occurs when a dipole is in the vicinity of a dielectric interface. The local field acting on the dipole results from the interferences of incident and reflected beams. Contributions from evanescent waves are important when the dipole is located in the medium of low refractive index, very close to the surface. The intensity of emission and its pattern are modified by the vicinity of the dielectric interface. Close to the interface semiconductor/air, the exciton binding energy is increased. In the vicinity of a metallic surface, á nonradiative transfer to the metal occurs for small distances of the nano-object or quantum weJl to the surface and the quantum efficiency varies with the distance to the metallic surface. The exciton binding energy of a quantum well is decreased close to a metallic surface.PACS numbers: 78.20.Βh, 78.55.Cr, 78.55.Et 1. Introduction The rate of spontaneous emission of a dipole is not an intrinsic property of the dipole but depends on its environment [1]: dielectric medium [2-5], dielectric interface [6][7][8], metallic interface [9,10] or cavity [11]. The modification of the emission rate of a dipole has been studied theoretically for many years. Numerous experimental studies have been done either with fluorescent ions or dye moleculeS [12][13][14][15][16][17]. In semiconductor physics the effect of a cavity on the rate of spontaneous emission of a quantum well was recognized recently [18,19], and during the last years, only a few studies have been done on the effect of a dielectric

show abstract

“…The radiation of antennas at the interface of media has been the subject of numerous studies to date [1][2][3][4][5][6][7][8][9][10][11][12][13]. The scenario of interest is a classic problem in electromagnetics dating back to the work of Sommerfeld in 1909, investigating the radiation of a source above a lossy halfspace [1].…”

Section: Introductionmentioning

confidence: 99%

Dipole Radiation Near Anisotropic Low-Permittivity Media

Memarian

Eleftheriades²

2013

PIER

View full text Add to dashboard Cite

Abstract-We investigate radiation of a dipole at or below the interface of (an)isotropic Epsilon Near Zero (ENZ) media, akin to the classic problem of a dipole above a dielectric half-space. To this end, the radiation patterns of dipoles at the interface of air and a general anisotropic medium (or immersed inside the medium) are derived using the Lorentz reciprocity method. By using an ENZ half-space, air takes on the role of the denser medium. Thus we obtain shaped radiation patterns in air which were only previously attainable inside the dielectric half-space. We then follow the early work of Collin on anisotropic artificial dielectrics which readily enables the implementation of practical anisotropic ENZs by simply stacking sub-wavelength periodic bi-layers of metal and dielectric at optical frequencies. We show that when such a realistic anisotropic ENZ has a low longitudinal permittivity, the desired shaped radiation patterns are achieved in air. In such cases the radiation is also much stronger in air than in the ENZ media, as air is the denser medium. Moreover, we investigate the subtle differences of the dipolar patterns when the anisotropic ENZ dispersion is either elliptic or hyperbolic.

show abstract

Light emission by magnetic and electric dipoles close to a plane interface I Total radiated power

Cited by 441 publications

References 15 publications

Directional emission from a single plasmonic scatterer

Directional emission from a single plasmonic scatterer

Light Emission by Semiconductor Nanostructures in Dielectric Medium or Close to Plane Interface

Dipole Radiation Near Anisotropic Low-Permittivity Media

Contact Info

Product

Resources

About