4,623 research outputs found
Method of Forming Composite Materials including Conjugated Materials attached to Carbon Nanotubes or Graphenes (CIP)
A method of forming composite materials includes dispersing a conjugated material, a solvent for the conjugated material, and a plurality of carbon nanotubes (CNTs) or graphene including structures having an outer surface to form a dispersion. The solvent is evaporated from the dispersion to yield a CNT or graphene composite including a plurality of crystalline supramolecular structures having the conjugated material non-covalently secured to the outer surface of the CNT or the graphene including structure. The supramolecular structures have an average length which extends outward in a length direction from the outer surface of the CNT or graphene including structure, where the average length is greater than an average width of the supramolecular structures
Supramolecular Structures Comprising At Least Partially Conjugated Polymers Attached to Carbon Nanotubes and Graphenes
A composition of matter includes at least one carbon nanotube (CNT) or grapheme type structure having an outer surface and a plurality of crystalline polymer supramolecular structures that includes a conjugated polymer that are non-covalently secured to the outer surface of the CNTs or the grapheme type structure. The conjugated polymer can be a conjugated homopolymer or a block copolymer including at least one conjugated block. The supramolecular structures extend outward from the outer surface of the CNTs or grapheme type structures
Efficient excitation and tuning of toroidal dipoles within individual homogenous nanoparticles
We revisit the fundamental topic of light scattering by single homogenous
nanoparticles from the new perspective of excitation and manipulation of
toroidal dipoles. It is revealed that besides within all-dielectric particles,
toroidal dipoles can also be efficiently excited within homogenous metallic
nanoparticles. Moreover, we show that those toroidal dipoles excited can be
spectrally tuned through adjusting the radial anisotropy parameters of the
materials, which paves the way for further more flexible manipulations of the
toroidal responses within photonic systems. The study into toroidal multipole
excitation and tuning within nanoparticles deepens our understanding of the
seminal problem of light scattering, and may incubate many scattering related
fundamental researches and applications.Comment: Four Figures,Ten Pages and Comments Welcome
Elusive pure anapole excitation in homogenous spherical nanoparticles with radial anisotropy
For homogenous isotropic dielectric nanospheres with incident plane waves,
Cartesian electric and toroidal dipoles can be tunned to cancel each other in
terms of far-field scattering, leading to the effective anopole excitation. At
the same time however, other multipoles such as magnetic dipoles with
comparable scattered power are simultanesouly excited, mixing with the anopole
and leading to a non-negligible total scattering cross section. Here we show
that for homogenous dielectric nanospheres, radial anisotropy can be employed
to significantly suppress the other multipole excitation, which at the same
time does not compromise the property of complete scattering cancallation
between Cartesian electric and toroidal dipoles. This enables an elusive pure
anopole excitation within radially anisotropic dielectric nanospheres, which
may shed new light to many scattering related fundamental researches and
applications.Comment: Invited submission with four figures and ten pages. Comments welcome
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