Surface Plasmon Enhanced Fluorescence Emission inside Metal Nanoshells
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Abstract:
We study the surface plasmon enhanced fluorescence where an emitter is embedded in a metal nanoshell. Both simulation and experimental results are presented.Keywords:
Nanoshell
Localized surface plasmon
Surface plasmon resonance of periodic narrow-grooved metallic thin films were studied with finite-difference time-domain simulations. Two distinguishable modes, surface plasmon polaritons and localized surface plasmons, are associated with different periods. The surface plasmon polaritons have widely extended near-field distributions and sharp resonance; however, the localized surface plasmon modes are highly concentrated in the grooves, and have broad resonance. Our results demonstrate that the surface plasmon polaritons and localized surface plasmons were coupled with electromagnetic waves to resonantly tunnel through the array of subwavelength holes. This optical tunneling effect exhibited large phase lag and time delay for the surface plasmon polariton. The broadness of localized surface plasmon resonance indicated that it could exist in randomly distributed, narrow-grooved structures as well.
Localized surface plasmon
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We study a surface plasmon polariton mode that is strongly confined in the transverse direction and propagates along a periodically nanostructured metal-dielectric interface. We show that the wavelength of this mode is determined by the period of the structure, and may therefore, be orders of magnitude smaller than the wavelength of a plasmon-polariton propagating along a flat surface. This plasmon polariton exists in the frequency region in which the sum of the real parts of the permittivities of the metal and dielectric is positive, a frequency region in which surface plasmon polaritons do not exist on a flat surface. The propagation length of the new mode can reach a several dozen wavelengths. This mode can be observed in materials that are uncommon in plasmonics, such as aluminum or sodium.
Localized surface plasmon
Nanophotonics
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We report surface-plasmon-polariton-induced suppressed transmission through two-dimensional arrays of isolated metal disks with a thickness comparable to optical skin depth of the metal. A transmittance dip of -17.5 dB is achieved at the resonant wavelength of 1524 nm, compared to -12 dB for closed film. Coupling the light into the surface-plasmon polariton results in enhanced absorption, which is potentially interesting in solar cell applications.
Localized surface plasmon
Extraordinary optical transmission
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We study a structure consisting of a gold disk array, an SiO2 spacer, and a gold film. We study the effect of spacer thickness on the anti-crossing between localized plasmons and surface plasmon polaritons.
Localized surface plasmon
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The characteristics of surface plasmon polaritons at a chiral-metal interface are analyzed in detail. Compared to conventional surface plasmon waves at a dielectric-metal interface, it is shown that chiral surface plasmon waves have distinguishing features such as the presence of an s-wave at the metal surface, the existence of a cutoff frequency and chirality value, and the dependence of the propagation length on the chiral parameter. These properties of chiral surface plasmon waves can be exploited for on-chip chiral sensing and enantiometric detection applications.
Localized surface plasmon
Interface (matter)
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The resonant coupling of surface and bulk plasmons that occurs inside the transition layer between a metal and a dielectric significantly modifies waveguiding properties of metallic nanostructures. In particular, it heavily affects the propagation of the surface plasmon polaritons maintained by a metal/dielectric interface. It is demonstrated that a great part of the energy guided by the surface plasmon polaritons is transmitted through this resonance to the bulk plasmons of the transition layer. The related damping of the surface polaritons is shown to be comparable to, or even higher than, the collisional attenuation. Thus, the plasmon coupling is predicted to play a key role for a range of plasmonic applications based on surface polaritons and their propagation in metallic nanostructures.
Localized surface plasmon
Nanophotonics
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Localized surface plasmon
Particle (ecology)
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In this study, guiding of surface plasmon polaritons excited at a gold film surface along corrugation-free channels in regions that are covered with randomly located surface scatterers, is considered using near-field microscopy for imaging of surface plasmon polariton intensity distributions at the surface. In the wavelength range 713-815 nm, we observed complete inhibition of the surface plasmon polariton propagation inside the random structures composed of individual ( approximately 70 nm high) gold bumps (and their clusters) placed on a 55 nm thick gold film with a bump density of 75 micro m-2. We demonstrate well-defined surface plasmon polariton guiding along corrugation-free 2 micro m wide channels in random structures and, in the wavelength range 738-774 nm, low-loss guiding around 20 degrees bends having a bend radius of approximately 15 micro m.
Localized surface plasmon
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We study the propagation properties of surface plasmon polaritons on a Cu surface by means of photoemission electron microscopy. Use of a CMOS process to fabricate the Cu thin film is shown to enable very high propagation distances (up to 65 μm at 750 nm wavelength), provided that the copper native oxide is removed. A critical review of the optical loss mechanisms is undertaken and shed light on the effect of single grain boundaries in increasing the propagation losses of the plasmon. A microscopic interpretation is provided, relying on groove induced electromagnetic hot spots.
Localized surface plasmon
Photoemission electron microscopy
Nanophotonics
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Localized surface plasmon
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