Spontaneous light emission in complex nanostructures

Blanco, L. A.; Abajo, F. Javier García de

doi:10.1103/physrevb.69.205414

Cited by 133 publications

(121 citation statements)

References 75 publications

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“…Here, the aperture serves as a nanoscale optical cavity that can be engineered to efficiently direct the emission of emitters placed inside the cavity. Furthermore, in contrast to previous directional antenna designs 9,[21][22][23][24][25] , this structure now enables beaming of fluorescence from many quantum emitters by having separated areas in the structure perform the functions of a cavity (the aperture) and the beaming (the patterned surface).…”

Section: Resultsmentioning

confidence: 99%

Plasmonic beaming and active control over fluorescent emission

Jun

Huang²,

Brongersma³

2011

Nat Commun

194

185

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nanometallic optical antennas are rapidly gaining popularity in applications that require exquisite control over light concentration and emission processes. The search is on for highperformance antennas that offer facile integration on chips. Here we demonstrate a new, easily fabricated optical antenna design that achieves an unprecedented level of control over fluorescent emission by combining concepts from plasmonics, radiative decay engineering and optical beaming. The antenna consists of a nanoscale plasmonic cavity filled with quantum dots coupled to a miniature grating structure that can be engineered to produce one or more highly collimated beams. Electromagnetic simulations and confocal microscopy were used to visualize the beaming process. The metals defining the plasmonic cavity can be utilized to electrically control the emission intensity and wavelength. These findings facilitate the realization of a new class of active optical antennas for use in new optical sources and a wide range of nanoscale optical spectroscopy applications.

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Section: Resultsmentioning

confidence: 99%

Plasmonic beaming and active control over fluorescent emission

Jun

Huang²,

Brongersma³

2011

Nat Commun

194

185

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“…We in particular consider the LDOS relative to its value in vacuum, ω 2 /3π 2 c 3 . The LDOS is proportional to the radiative decay rate of excited atoms [17], which we in turn obtain using BEM from the imaginary part of the self-induced electric field acting back on a dipole [18]. We have double checked our results by comparing with the excess of space-integrated total density of states (DOS) with respect to vacuum, which is directly accessible through 2D-MESME [17].…”

mentioning

confidence: 99%

Robust Plasmon Waveguides in Strongly Interacting Nanowire Arrays

2008

Self Cite

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Arrays of parallel metallic nanowires are shown to provide a tunable, robust, and versatile platform for plasmon interconnects, including high-curvature turns with minimum signal loss. The proposed guiding mechanism relies on gap plasmons existing in the region between adjacent nanowires of dimers and multi-wire arrays. We focus on square and circular silver nanowires in silica, for which excellent agreement between both boundary element method and multiple multipolar expansion calculations is obtained. Our work provides the tools for designing plasmon-based interconnects and achieving high degree of integration with minimum cross talk between adjacent plasmon guides.PACS numbers: 73.20. Mf,84.40.Az,42.82.Gw Electromagnetic modes in metal surfaces known as plasmons can propagate along millimeters in metallic structures at near-infrared frequencies [1], thus providing a plausible substitute for the electrical impulses used in current electronic circuits operating at microwave clock frequencies [2,3]. Several designs of plasmon interconnects have been prototyped in recent years, including metallic waveguides of finite cross section in symmetric [4,5] and asymmetric [6] environments, channels cut into flat surfaces [7], plasmon-band-gap structures based upon periodic corrugations [8], and plasmon hopping in arrays of nanoparticles [9,10]. Plasmon modes can be tuned in frequency, and their spatial distribution molded, by tailoring the geometry of metallic structures on the nanometer scale. In particular, extreme plasmon confinement has been achieved in narrow insulator films buried inside metal [11]. Actually, buried structures provide a natural but technologically challenging approach to compact integration. In contrast to that, open plasmonic geometries involve electromagnetic fields extending significantly away from the metal [5,6,7,8,9,10], and consequently producing a substantial degree of cross-talk between neighboring waveguides [12].In this Letter, arrays of parallel metallic nanowires are shown to provide a versatile and tunable platform for highly-integrated plasmon interconnects. The propagation distance and degree of confinement of the plasmon guided modes depend strongly on the separation between wires. Individual wire modes are recovered at large separations, while mode hybridization is observed when the spacing is reduced. Gap modes are observed at small separations, highly localized in the regions between two adjacent wires. We use both the boundary element method (BEM) [13] and a two-dimensional multipleelastic-scattering multipolar expansion of the fields for straight cylinders (2D-MESME) [14], with the two approaches resulting in complete agreement on the scale of the plots. These methods provide rigorous solutions of Maxwell's equations in frequency space for materials described by local dielectric functions and separated by abrupt interfaces. We focus on silver nanowires of circular and square cross sections embedded in silica. The dielectric functions of silver [15] and silica [16] have been...

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“…So SPPs can be used to control the radiation rate of the excitation and improve the quantum yield. In this respect, several theoretical and experimental realizations have been studied, such as emitters close to interface [11,12], nanospheres [13], nano-rings [14], inside cavities [15,16], and photonic crystals [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Optimizing Nano-Optical Antenna for the Enhancement of Spontaneous Emission

Gao¹,

Li²,

Kong

et al. 2010

PIER

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Abstract-We study the characteristics of nano-optical antenna made of two gold nano-particles by three dimensional numerical calculations in visible and near infrared bands. To carry the computational burden and guarantee the precision and speed of a three dimensional FDTD calculation, adaptive mesh refinement technology is used. In this paper, we first highlight the concrete way of controlling the emitter position and orientation to fulfill the requirements of larger spontaneous emission enhancement. Then, we analyze the far field distribution and find that the far field directivity is strongly influenced by surface plasmon polaritons (SPPs). Choosing the incident wavelength of 600 nm, we compute the decay rates and radiant efficiency as a function of antenna geometry limitations. Next, the particle aspect ratio is optimized, and we obtain that L/R = 4 is the best for our optical-antenna. Furthermore, we present a spectrum analysis. Around 5000 fold spontaneous emission enhancement is successfully achieved. Finally, we find a piecewise linearity relationship between the particle length and resonant wavelength.

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Spontaneous light emission in complex nanostructures

Cited by 133 publications

References 75 publications

Plasmonic beaming and active control over fluorescent emission

Plasmonic beaming and active control over fluorescent emission

Robust Plasmon Waveguides in Strongly Interacting Nanowire Arrays

Optimizing Nano-Optical Antenna for the Enhancement of Spontaneous Emission

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