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Interactions of Organic Fluorophores with Plasmonic Surface Lattice Resonances.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Interactions of Organic Fluorophores with Plasmonic Surface Lattice Resonances./
作者:	Collison, Robert.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	165 p.
附註:	Source: Dissertations Abstracts International, Volume: 82-06, Section: B.
Contained By:	Dissertations Abstracts International82-06B.
標題:	Nanoscience. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28155645
ISBN:	9798557008549

Interactions of Organic Fluorophores with Plasmonic Surface Lattice Resonances.
Collison, Robert.

Interactions of Organic Fluorophores with Plasmonic Surface Lattice Resonances. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 165 p.

Source: Dissertations Abstracts International, Volume: 82-06, Section: B.

Thesis (Ph.D.)--City University of New York, 2021.

This item must not be sold to any third party vendors.

It is common knowledge that metals, alloys and pure elements alike, are lustrous and reflective, the more so when a metal surface is flat, polished, and free from oxidation and surface fouling. However, some metals reflect visible light, in the 380 nm to 740 nm range of wavelengths, much more strongly than others. In particular, some metals reflect wavelengths in certain portions of the ultraviolet (UV), visible, and near-infrared (NIR) regime, let us say 200 nm to 2000 nm, while absorbing light strongly in other segments of this range. There are several factors that account for this difference between various metals. For a particular metal, its absorbance and reflectance (and, for thin films, transmittance) at various wavelengths are a function of the metal electronic band structure. Metals that have both an abundance of mobile ("free") valence electrons and an abundance of vacant states in the valence band are able to support propagating oscillations in the free-electron density, much like sound waves in air, which are referred to as plasma oscillations, which are essentially pressure waves in the "plasma" or gas of free electrons in the solid metal. When described as quasiparticles in a manner analogous to phonons (lattice vibrations, propagating oscillations in the positions of atomic nuclei), these electron-density oscillations are referred to as plasmons, specifically volume or bulk plasmons when they exist and propagate in a continuous three-dimensional metal space. In principle, all metals have free electrons and partially occupied valence bands, so all metals ought to support plasmons to some extent, but the strength of the oscillations is greater in some metals (metals with large valence band occupancy and a high density of states at the Fermi level) than in others, and the metals with the strongest plasma oscillations are known as "plasmonic" metals. In terms of pure elements, the most plasmonic metals are, canonically, copper, silver, and gold. But there are several others that are known to be plasmonic, namely aluminum, gallium, and indium, as well as the alkali metals, magnesium, and nickel. Depending on the definition of plasmonic that one chooses, other metals would also qualify, but these listed metals are broadly considered "plasmonic", and are accordingly known to strongly reflect visible light (barring surface oxidation, of course).The plasmonicity of these metals contributes to the high reflectivity of their bulk surfaces and films, which explains, in part, the fiery glint of gold-plated statues in sunlight, the faithful image reflection from silvered-glass mirrors, the use of a burnished speculum (roughly 70% copper, 30 % tin, by weight) alloy plate in the first reflecting telescope, and the use today of aluminum films in electric lamps, including car headlights, where reflecting the light out with minimal light loss due to absorption is key to their function. Of course, in all of these cases, the resistance to surface oxidation (especially for gold) or, for silver, the discovery that it could be deposited onto glass chemically, also contribute to their visible luster and to their historical use in mirrors and reflectors. But the plasmonicity of these metals can have very different effects when they are not shaped into smooth surfaces. In particular, when nanoparticles roughly 5 nm to 200 nm wide are made from plasmonic metals, they exhibit intense light scattering and absorption in the ultraviolet-visible-near-infrared regime. These intense optical effects are due, at least in large part, to the localized surface plasmon resonances (LSPRs) of the particles, and in particles in the 5 nm to 200 nm width range, the dipolar LSPRs, in which incident light excites an oscillating electric dipole within the particle, is often the fundamental mode that gives rise to their light scattering and absorbing properties, although higher order LSPRs (quadrupole, sextupole, octupole, etc.) may also play a significant role, especially for larger particles. Nanoparticles supporting LSPRs have many applications in colloidal suspension and in amorphous films and solids, in which they can act as a powerful pigment, as light-to-heat converters, as anti-reflection coatings, and as optical tags for biomolecules.This dissertation is not primarily concerned with the LSPRs of colloids and disordered films of plasmonic particles. Rather, this dissertation focusses on a different kind of plasmonic resonance that requires plasmonic particles to be arranged in an ordered one-dimensional or two-dimensional lattice, and embedded in a transparent dielectric (electrically insulating or semiconducting) medium. This new plasmonic mode, formed by the mutual radiative coupling of the dipolar LSPRs of the individual plasmonic nanoparticles constituting the lattice, is known as a surface lattice resonance (SLR), sometimes described as a plasmonic SLR to distinguish it from lattice resonances supported by lattices of Mie-scattering dielectric particles or excitonic. (Abstract shortened by ProQuest).

ISBN: 9798557008549Subjects--Topical Terms:

587832
Nanoscience.
Subjects--Index Terms:

Energy transfer

Interactions of Organic Fluorophores with Plasmonic Surface Lattice Resonances.
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500 $a Source: Dissertations Abstracts International, Volume: 82-06, Section: B.
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520 $a It is common knowledge that metals, alloys and pure elements alike, are lustrous and reflective, the more so when a metal surface is flat, polished, and free from oxidation and surface fouling. However, some metals reflect visible light, in the 380 nm to 740 nm range of wavelengths, much more strongly than others. In particular, some metals reflect wavelengths in certain portions of the ultraviolet (UV), visible, and near-infrared (NIR) regime, let us say 200 nm to 2000 nm, while absorbing light strongly in other segments of this range. There are several factors that account for this difference between various metals. For a particular metal, its absorbance and reflectance (and, for thin films, transmittance) at various wavelengths are a function of the metal electronic band structure. Metals that have both an abundance of mobile ("free") valence electrons and an abundance of vacant states in the valence band are able to support propagating oscillations in the free-electron density, much like sound waves in air, which are referred to as plasma oscillations, which are essentially pressure waves in the "plasma" or gas of free electrons in the solid metal. When described as quasiparticles in a manner analogous to phonons (lattice vibrations, propagating oscillations in the positions of atomic nuclei), these electron-density oscillations are referred to as plasmons, specifically volume or bulk plasmons when they exist and propagate in a continuous three-dimensional metal space. In principle, all metals have free electrons and partially occupied valence bands, so all metals ought to support plasmons to some extent, but the strength of the oscillations is greater in some metals (metals with large valence band occupancy and a high density of states at the Fermi level) than in others, and the metals with the strongest plasma oscillations are known as "plasmonic" metals. In terms of pure elements, the most plasmonic metals are, canonically, copper, silver, and gold. But there are several others that are known to be plasmonic, namely aluminum, gallium, and indium, as well as the alkali metals, magnesium, and nickel. Depending on the definition of plasmonic that one chooses, other metals would also qualify, but these listed metals are broadly considered "plasmonic", and are accordingly known to strongly reflect visible light (barring surface oxidation, of course).The plasmonicity of these metals contributes to the high reflectivity of their bulk surfaces and films, which explains, in part, the fiery glint of gold-plated statues in sunlight, the faithful image reflection from silvered-glass mirrors, the use of a burnished speculum (roughly 70% copper, 30 % tin, by weight) alloy plate in the first reflecting telescope, and the use today of aluminum films in electric lamps, including car headlights, where reflecting the light out with minimal light loss due to absorption is key to their function. Of course, in all of these cases, the resistance to surface oxidation (especially for gold) or, for silver, the discovery that it could be deposited onto glass chemically, also contribute to their visible luster and to their historical use in mirrors and reflectors. But the plasmonicity of these metals can have very different effects when they are not shaped into smooth surfaces. In particular, when nanoparticles roughly 5 nm to 200 nm wide are made from plasmonic metals, they exhibit intense light scattering and absorption in the ultraviolet-visible-near-infrared regime. These intense optical effects are due, at least in large part, to the localized surface plasmon resonances (LSPRs) of the particles, and in particles in the 5 nm to 200 nm width range, the dipolar LSPRs, in which incident light excites an oscillating electric dipole within the particle, is often the fundamental mode that gives rise to their light scattering and absorbing properties, although higher order LSPRs (quadrupole, sextupole, octupole, etc.) may also play a significant role, especially for larger particles. Nanoparticles supporting LSPRs have many applications in colloidal suspension and in amorphous films and solids, in which they can act as a powerful pigment, as light-to-heat converters, as anti-reflection coatings, and as optical tags for biomolecules.This dissertation is not primarily concerned with the LSPRs of colloids and disordered films of plasmonic particles. Rather, this dissertation focusses on a different kind of plasmonic resonance that requires plasmonic particles to be arranged in an ordered one-dimensional or two-dimensional lattice, and embedded in a transparent dielectric (electrically insulating or semiconducting) medium. This new plasmonic mode, formed by the mutual radiative coupling of the dipolar LSPRs of the individual plasmonic nanoparticles constituting the lattice, is known as a surface lattice resonance (SLR), sometimes described as a plasmonic SLR to distinguish it from lattice resonances supported by lattices of Mie-scattering dielectric particles or excitonic. (Abstract shortened by ProQuest).
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