Impact of strong localization of the incident power density on the nano-amplifier characteristics of active coated nano-particles

Campbell, Sawyer D.; Ziolkowski, Richard W.

doi:10.1016/j.optcom.2011.11.006

Cited by 31 publications

(30 citation statements)

References 43 publications

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“…In view of this, it is clear that the extracted power can exceed several times the incident power over the physical area of the particle. As noted in [6], [19], this strong convergent effect is accompanied by the creation of whirlpools in the Poynting vector field near the particle. As expected, this effect again becomes weaker away from the resonance .…”

Section: The Coated Sphere: a Case Studymentioning

confidence: 65%

“…All quantities of interest were computed as detailed in Section III. The unknowns of the problem, which are the scattered field coefficients, have been determined by enforcing the boundary conditions at the surface of the scatterer, for instance, as reported in [19], [20]. The core-shell scatterer is characterized geometrically by the internal, , and the external, , radii.…”

Section: The Coated Sphere: a Case Studymentioning

confidence: 99%

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Analytical and Equivalent Circuit Models to Elucidate Power Balance in Scattering Problems

Liberal

Ziolkowski

2013

IEEE Trans. Antennas Propagat.

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Analytical and equivalent circuit models are presented to elucidate the balance of powers in scattering processes. Specifically, closed-form expressions of the associated maximal extracted, scattered, absorbed and reactive powers are formulated. The circuit model then helps to characterize in a straightforward manner these powers, to provide physical insights into the inter-relationships among this set, and thus guides the resolution of their fundamental limits. The analysis demonstrates that the absorbed power can not exceed 25% of the power extracted from the incident field (extracted power) for the lossless case and helps extricate the conditions for which the scattered and absorbed powers are equal or significantly different. A coated sphere illuminated by a plane wave under both resonant and cloaked states is selected as an illustrative example. Although the analysis and circuit models are rigorously derived for spheroidal particles, their extrapolation to arbitrary scatterers is also discussed.

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Section: The Coated Sphere: a Case Studymentioning

confidence: 65%

Section: The Coated Sphere: a Case Studymentioning

confidence: 99%

Analytical and Equivalent Circuit Models to Elucidate Power Balance in Scattering Problems

Liberal

Ziolkowski

2013

IEEE Trans. Antennas Propagat.

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“…Moreover, if the entire dispersion engineering problem were considered, the goal would be to have both the resonances occur at the peak value of any dispersive gain model that is employed. As speculated and seen experimentally [8,[37][38][39][40] and as demonstrated theoretically [41,42], the physical, bulk gain constants needed for the physical realization of gain-assisted nano-structures that exhibit extreme localization of the exciting fields in their gain regions and the corresponding resonance-enhanced scattering crosssections are related to the effective values predicted directly from simulation, but are considerably less in reality because of those effects. The revised theoretical values, taking into account the impact of this resonant localization on the actual gain constants, are well within known values achieved by dyes [37], nanolasers [43] and quantum dots [44].…”

Section: Background: Cnp Casesmentioning

confidence: 79%

INFLUENCE OF ACTIVE NANO PARTICLE SIZE AND MATERIAL COMPOSITION ON MULTIPLE QUANTUM EMITTER ENHANCEMENTS: THEIR ENHANCEMENT AND JAMMING EFFECTS (Invited Paper)

Arslanagić¹,

Ziolkowski²

2014

PIER

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Abstract-In the 150 years that scientists and engineers have used Maxwell's equations to describe electromagnetic phenomena, canonical scattering and radiating problems have played a very important role, providing explanations of and insights into their underlying physics. With the same intent, a variety of active coated nano-particles are examined here theoretically with regard to their ability to effectively enhance or jam the responses of quantum emitters, e.g., fluorescing molecules, and nanoantennas to an observer located in their far-field regions. The investigated spherical particles consist of a gain-impregnated silica nano-core covered with a nano-shell of a specific plasmonic material. Attention is devoted to the influence of the over-all size of these particles and their material composition on the obtained levels of active enhancement or jamming. Silver, gold and copper are employed as their nanoshells. The over-all diameters of the investigated coated nano-particles are taken to be 20 nm, 40 nm, and 60 nm, while maintaining the same ratio of the core radius and shell thickness. It is shown that the jamming levels, particularly when several emitters are present, are significantly larger for particles of larger sizes. These configurations are also shown to lead to the largest enhancement levels of the surrounding quantum emitters. Furthermore, for a fixed particle size and for a gain constant that produces the largest enhancement peak at optical wavelengths, it is demonstrated that these larger levels are most notable when the nano-shell is gold.

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“…[6][7][8][9][10] Yet, these problems may be solved by incorporating gain materials such as rare earth ions and laser dyes, which compensate optical loss, narrow LSPR peak width and are even theoretically demonstrated to enable lasing state. [11][12][13][14][15][16][17][18][19][20] In this work, through numerical simulation, we aim to achieve sharp scattering peaks at red, green and blue light, with absorption being maintained low over the visible light range (400 nm ~ 800 nm) based on metallic nanoparticle's LSPR effect and gain material's loss compensation. Optimizations based on metallic nanosphere and coreshell structures of metal@silica and silica@metal are conducted for gold (Au), silver (Ag) and aluminium (Al), with and without gain material, with the size effect of metallic nanoparticle on metal's dielectric function taken into account.…”

Section: Introductionmentioning

confidence: 99%

Sharp selective scattering of red, green, and blue light achieved via gain material’s loss compensation

Ye¹,

Liu²,

Song³

et al. 2019

Opt. Express

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For a transparent projection screen based on metallic nanoparticle's localized surface plasmon resonance (LSPR), in the ideal case the metallic nanoparticles dispersed in a transparent matrix only selectively scatter red, green and blue light and transmit the visible light of other colours. However, metal's optical loss and size effect at nanoscale degenerate the desired performance by broadening the resonance peak width and increasing the absorption ratio. In this work, it is shown that the problem can be solved by introducing gain material. Numerical simulations are performed on nanostructures based on silver (Ag), gold (Au) or aluminium (Al) with or without gain material, to examine the effect of gain material and to search for suitable structures for sharp selective scattering of red, green and blue light. And it is found that introducing gain material greatly improves performance of the structures based on Ag or Au except the structures based on Al. The most suitable structures for sharp selective scattering of red, green and blue light are respectively found to be the core-shell structures of silica@Au, silica@Ag and Ag@silica, all with gain material.

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Impact of strong localization of the incident power density on the nano-amplifier characteristics of active coated nano-particles

Cited by 31 publications

References 43 publications

Analytical and Equivalent Circuit Models to Elucidate Power Balance in Scattering Problems

Analytical and Equivalent Circuit Models to Elucidate Power Balance in Scattering Problems

INFLUENCE OF ACTIVE NANO PARTICLE SIZE AND MATERIAL COMPOSITION ON MULTIPLE QUANTUM EMITTER ENHANCEMENTS: THEIR ENHANCEMENT AND JAMMING EFFECTS (Invited Paper)

Sharp selective scattering of red, green, and blue light achieved via gain material’s loss compensation

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