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@PHDTHESIS{Linn:566341,
      author       = {Linn, Malte Jonathan},
      othercontributors = {von Plessen, Gero and Simon, Ulrich},
      title        = {{G}rößen- und {S}trukturabhängigkeit der optischen
                      {E}igenschaften von {DNA}-{G}oldnanopartikel-{N}etzwerken},
      school       = {RWTH Aachen},
      type         = {Dissertation},
      address      = {Aachen},
      reportid     = {RWTH-2016-00434},
      pages        = {1 Online-Ressource (x, 242 Seiten) : Illustrationen,
                      Diagramme},
      year         = {2015},
      note         = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
                      University 2016; Dissertation, RWTH Aachen, 2015},
      abstract     = {Noble-metal nanoparticles are widely used in the field of
                      nanoscience and nanotechnological applictions. When
                      irradiated with visible or infrared light, these particles
                      exhibit unique optical properties. The most important
                      features are a strong local field enhancement and resonantly
                      enhanced light-scattering and light-absorption. Especially,
                      gold nanoparticles are widely used for therapeutic and
                      diagnostic applications in nanomedicine and bionanoscience,
                      since they are biocompatible and enable a diverse surface
                      chemistry. Therefore, gold nanoparticles are the basic
                      elements for bio-nano-hybrid systems. The strong light
                      absorption of gold nanoparticles allows an efficient and
                      localized deposition of light energy in terms of heat into
                      such a system. This enables the remote control of
                      temperature sensitive biomolecular reactions. Since the
                      optical properties of gold nanoparticles or rather
                      nanoparticle systems is governed by their size, internal
                      structure and their direct environment, photothermally
                      induced changes in bio-nano-hybrid systems can be monitored
                      optically. A prominent example of such sample systems are
                      DNA-gold-nanoparticle networks, where the gold nanoparticles
                      are linked by double-stranded DNA. These networks can be
                      switched between different states, by heating and thus
                      dehybridizing the DNA double-strands into single strands.
                      The subsequent network dissociation is reversible upon
                      cooling.This thesis is devoted to the question how the size
                      and internal structure of different DNA-gold-nanoparticles
                      influences their optical and photothermal properties.
                      Spectroscopic methods are used to determine the
                      characteristic light scattering and extinction properties of
                      networks with different sizes and morphologies. The
                      networks' ability to scatter light increases with increasing
                      network size. Additionally, the measured resonance curves
                      are spectraclly shifted and broadened with increasing
                      network size. These phenomena are used to detect the network
                      dissociation of networks with one and two transitions
                      spectroscopically. Doing so, the photothermally induced
                      temperature rise inside the networks, when irradiated with
                      continuous wave laser light, is found to rise with both
                      laser intensity and network size. By using exact
                      electrodynamic caluclations together with numerical heat
                      transport calculations, the experimental findings can be
                      confirmed qualitatively. The DNA-gold-nanoparticle networks,
                      consisting of up to thousands of particles, show new,
                      wavelength-dependent optical phenomena: The calculated
                      electric field-distribution inside the networks shows the
                      development of standing light waves. The spacial positions
                      of the nodes and antinodes of these standing waves relates
                      directly to the positions of low and high absorption inside
                      the network. Further, narrow, high-intensity light beams,
                      so-called photonic nanojets, can arise behind the networks.
                      Another main emphasis of this work is the detailed analysis
                      of heat transport phenomena. By using interferometric
                      methods, the photothermally induced temperature profile
                      inside a nanoparticle suspension is obtained. Also, the
                      onset of convective effects in such solutions is studied and
                      quantified. Besides, the influence of convective flows has a
                      strong influence on time-resolved measurements of the
                      network dissociation process under continuous wave laser
                      irradiation.},
      cin          = {131820 / 130000},
      ddc          = {530},
      cid          = {$I:(DE-82)131820_20140620$ / $I:(DE-82)130000_20140620$},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:hbz:82-rwth-2016-004343},
      url          = {https://publications.rwth-aachen.de/record/566341},
}