@article{23616,
  author       = {{Galluzzo, Michael D. and Grundy, Lorena S. and Takacs, Christopher J. and Cao, Chuntian and Steinrück, Hans-Georg and Fu, Sean and Rivas Valadez, Michael A. and Toney, Michael F. and Balsara, Nitash P.}},
  issn         = {{0024-9297}},
  journal      = {{Macromolecules}},
  pages        = {{7808--7824}},
  title        = {{{Orientation-Dependent Distortion of Lamellae in a Block Copolymer Electrolyte under DC Polarization}}},
  doi          = {{10.1021/acs.macromol.1c01295}},
  volume       = {{54}},
  year         = {{2021}},
}

@article{23815,
  abstract     = {{In this paper, silicon oxynitride films (SiON) grown by plasma-enhanced chemical vapor deposition are investigated. As precursor gases silane (SiH4), nitrous oxide (N2O), nitrogen (N2) and ammonia (NH3) are used with different compositions. We find that for achieving high nitrogen content adding ammonia to the precursor mix is most efficient. Moreover, we investigate the balance between adsorption and desorption processes during film growth by investigating the film growth rate as a function of the substrate temperature. From these data we are able to determine an effective activation energy for the film growth, corresponding to the difference between adsorption and desorption energy. Finally, we have thoroughly investigated the optical properties of the films using spectroscopic ellipsometry. From these measurements, we suggest a parametrized model for the refractive index and extinction coefficient in a wide range of compositions based on a Cauchy- and a Lorentz-fit.}},
  author       = {{Aschwanden, R. and Köthemann, R. and Albert, M. and Golla, C. and Meier, Cedrik}},
  issn         = {{0040-6090}},
  journal      = {{Thin Solid Films}},
  title        = {{{Optical properties of silicon oxynitride films grown by plasma-enhanced chemical vapor deposition}}},
  doi          = {{10.1016/j.tsf.2021.138887}},
  volume       = {{736}},
  year         = {{2021}},
}

@article{20900,
  author       = {{Albert, M. and Golla, C. and Meier, Cedrik}},
  issn         = {{0022-0248}},
  journal      = {{Journal of Crystal Growth}},
  title        = {{{Optical in-situ temperature management for high-quality ZnO molecular beam epitaxy}}},
  doi          = {{10.1016/j.jcrysgro.2020.126009}},
  volume       = {{557}},
  year         = {{2021}},
}

@article{22214,
  author       = {{Mund, Johannes and Yakovlev, Dmitri R. and Sadofev, Sergey and Meier, Cedrik and Bayer, Manfred}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  title        = {{{Second harmonic generation on excitons in ZnO/(Zn,Mg)O quantum wells with built-in electric fields}}},
  doi          = {{10.1103/physrevb.103.195311}},
  volume       = {{103}},
  year         = {{2021}},
}

@article{22215,
  abstract     = {{Topological states of light represent counterintuitive optical modes localized at boundaries of finite-size optical structures that originate from the properties of the bulk. Being defined by bulk properties, such boundary states are insensitive to certain types of perturbations, thus naturally enhancing robustness of photonic circuitries. Conventionally, the N-dimensional bulk modes correspond to (N – 1)-dimensional boundary states. The higher-order bulk-boundary correspondence relates N-dimensional bulk to boundary states with dimensionality reduced by more than 1. A special interest lies in miniaturization of such higher-order topological states to the nanoscale. Here, we realize nanoscale topological corner states in metasurfaces with C6-symmetric honeycomb lattices. We directly observe nanoscale topology-empowered edge and corner localizations of light and enhancement of light–matter interactions via a nonlinear imaging technique. Control of light at the nanoscale empowered by topology may facilitate miniaturization and on-chip integration of classical and quantum photonic devices.}},
  author       = {{Kruk, Sergey S. and Gao, Wenlong and Choi, Duk-Yong and Zentgraf, Thomas and Zhang, Shuang and Kivshar, Yuri}},
  issn         = {{1530-6984}},
  journal      = {{Nano Letters}},
  number       = {{11}},
  pages        = {{4592–4597}},
  publisher    = {{ACS}},
  title        = {{{Nonlinear Imaging of Nanoscale Topological Corner States}}},
  doi          = {{10.1021/acs.nanolett.1c00449}},
  volume       = {{21}},
  year         = {{2021}},
}

@article{22450,
  abstract     = {{We realize and investigate a nonlinear metasurface taking advantage of intersubband transitions in ultranarrow GaN/AlN multi-quantum well heterostructures. Owing to huge band offsets, the structures offer resonant transitions in the telecom window around 1.55 µm. These heterostructures are functionalized with an array of plasmonic antennas featuring cross-polarized resonances at these near-infrared wavelengths and their second harmonic. This kind of nonlinear metasurface allows for substantial second-harmonic generation at normal incidence which is completely absent for an antenna array without the multi-quantum well structure underneath. While the second harmonic is originally radiated only into the plane of the quantum wells, a proper geometrical arrangement of the plasmonic elements permits the redirection of the second-harmonic light to free-space radiation, which is emitted perpendicular to the surface.}},
  author       = {{Mundry, Jan and Spreyer, Florian and Jmerik, Valentin and Ivanov, Sergey and Zentgraf, Thomas and Betz, Markus}},
  issn         = {{2159-3930}},
  journal      = {{Optical Materials Express}},
  number       = {{7}},
  publisher    = {{OSA}},
  title        = {{{Nonlinear metasurface combining telecom-range intersubband transitions in GaN/AlN quantum wells with resonant plasmonic antenna arrays}}},
  doi          = {{10.1364/ome.426236}},
  volume       = {{11}},
  year         = {{2021}},
}

@article{22533,
  author       = {{Meier, F. and Protte, M. and Baron, E. and Feneberg, M. and Goldhahn, R. and Reuter, Dirk and As, D. J.}},
  issn         = {{2158-3226}},
  journal      = {{AIP Advances}},
  title        = {{{Selective area growth of cubic gallium nitride on silicon (001) and 3C-silicon carbide (001)}}},
  doi          = {{10.1063/5.0053865}},
  year         = {{2021}},
}

@article{22636,
  abstract     = {{<jats:p>The effects that solid–liquid interfaces exert on the aggregation of proteins and peptides are of high relevance for various fields of basic and applied research, ranging from molecular biology and biomedicine to nanotechnology. While the influence of surface chemistry has received a lot of attention in this context, the role of surface topography has mostly been neglected so far. In this work, therefore, we investigate the aggregation of the type 2 diabetes-associated peptide hormone hIAPP in contact with flat and nanopatterned silicon oxide surfaces. The nanopatterned surfaces are produced by ion beam irradiation, resulting in well-defined anisotropic ripple patterns with heights and periodicities of about 1.5 and 30 nm, respectively. Using time-lapse atomic force microscopy, the morphology of the hIAPP aggregates is characterized quantitatively. Aggregation results in both amorphous aggregates and amyloid fibrils, with the presence of the nanopatterns leading to retarded fibrillization and stronger amorphous aggregation. This is attributed to structural differences in the amorphous aggregates formed at the nanopatterned surface, which result in a lower propensity for nucleating amyloid fibrillization. Our results demonstrate that nanoscale surface topography may modulate peptide and protein aggregation pathways in complex and intricate ways.</jats:p>}},
  author       = {{Hanke, Marcel and Yang, Yu and Ji, Yuxin and Grundmeier, Guido and Keller, Adrian}},
  issn         = {{1422-0067}},
  journal      = {{International Journal of Molecular Sciences}},
  pages        = {{5142}},
  title        = {{{Nanoscale Surface Topography Modulates hIAPP Aggregation Pathways at Solid–Liquid Interfaces}}},
  doi          = {{10.3390/ijms22105142}},
  volume       = {{22}},
  year         = {{2021}},
}

@article{22637,
  abstract     = {{<jats:title>Abstract</jats:title>
               <jats:p>Doxorubicin (DOX) is a common drug in cancer chemotherapy, and its high DNA-binding affinity can be harnessed in preparing DOX-loaded DNA nanostructures for targeted delivery and therapeutics. Although DOX has been widely studied, the existing literature of DOX-loaded DNA-carriers remains limited and incoherent. Here, based on an in-depth spectroscopic analysis, we characterize and optimize the DOX loading into different 2D and 3D scaffolded DNA origami nanostructures (DONs). In our experimental conditions, all DONs show similar DOX binding capacities (one DOX molecule per two to three base pairs), and the binding equilibrium is reached within seconds, remarkably faster than previously acknowledged. To characterize drug release profiles, DON degradation and DOX release from the complexes upon DNase I digestion was studied. For the employed DONs, the relative doses (DOX molecules released per unit time) may vary by two orders of magnitude depending on the DON superstructure. In addition, we identify DOX aggregation mechanisms and spectral changes linked to pH, magnesium, and DOX concentration. These features have been largely ignored in experimenting with DNA nanostructures, but are probably the major sources of the incoherence of the experimental results so far. Therefore, we believe this work can act as a guide to tailoring the release profiles and developing better drug delivery systems based on DNA-carriers.</jats:p>}},
  author       = {{Ijäs, Heini and Shen, Boxuan and Heuer-Jungemann, Amelie and Keller, Adrian and Kostiainen, Mauri A and Liedl, Tim and Ihalainen, Janne A and Linko, Veikko}},
  issn         = {{0305-1048}},
  journal      = {{Nucleic Acids Research}},
  pages        = {{3048--3062}},
  title        = {{{Unraveling the interaction between doxorubicin and DNA origami nanostructures for customizable chemotherapeutic drug release}}},
  doi          = {{10.1093/nar/gkab097}},
  volume       = {{49}},
  year         = {{2021}},
}

@article{22638,
  author       = {{Xin, Y and Shen, B and Kostiainen, MA and Grundmeier, Guido and Castro, M and Linko, V and Keller, Adrian}},
  issn         = {{0947-6539}},
  journal      = {{Chemistry – A European Journal}},
  number       = {{33}},
  pages        = {{8564--8571}},
  title        = {{{Scaling Up DNA Origami Lattice Assembly.}}},
  doi          = {{10.1002/chem.202100784}},
  volume       = {{27}},
  year         = {{2021}},
}

@article{22639,
  author       = {{Yang, Y and Knust, S and Schwiderek, S and Qin, Q and Yun, Q and Grundmeier, Guido and Keller, Adrian}},
  issn         = {{2079-4991}},
  journal      = {{Nanomaterials}},
  number       = {{2}},
  pages        = {{ 357 }},
  title        = {{{Protein Adsorption at Nanorough Titanium Oxide Surfaces: The Importance of Surface Statistical Parameters beyond Surface Roughness.}}},
  doi          = {{10.3390/nano11020357}},
  volume       = {{11}},
  year         = {{2021}},
}

@article{22640,
  author       = {{Piskunen, Petteri and Shen, Boxuan and Keller, Adrian and Toppari, J. Jussi and Kostiainen, Mauri A. and Linko, Veikko}},
  issn         = {{2574-0970}},
  journal      = {{ACS Applied Nano Materials}},
  pages        = {{529--538}},
  title        = {{{Biotemplated Lithography of Inorganic Nanostructures (BLIN) for Versatile Patterning of Functional Materials}}},
  doi          = {{10.1021/acsanm.0c02849}},
  volume       = {{4}},
  year         = {{2021}},
}

@article{22641,
  author       = {{Smith, DM and Keller, Adrian}},
  issn         = {{2699-9307}},
  journal      = {{Advanced NanoBiomed Research}},
  pages        = {{2000049}},
  title        = {{{DNA Nanostructures in the Fight Against Infectious Diseases.}}},
  doi          = {{10.1002/anbr.202000049}},
  volume       = {{1}},
  year         = {{2021}},
}

@article{22642,
  author       = {{Xin, Y and Grundmeier, Guido and Keller, Adrian}},
  issn         = {{2699-9307}},
  journal      = {{Advanced NanoBiomed Research}},
  number       = {{2}},
  pages        = {{2170023}},
  title        = {{{Adsorption of SARS-CoV-2 Spike Protein S1 at Oxide Surfaces Studied by High-Speed Atomic Force Microscopy.}}},
  doi          = {{10.1002/anbr.202170023}},
  volume       = {{1}},
  year         = {{2021}},
}

@article{22643,
  author       = {{Yang, Yu and Yu, Mingrui and Böke, Frederik and Qin, Qin and Hübner, René and Knust, Steffen and Schwiderek, Sabrina and Grundmeier, Guido and Fischer, Horst and Keller, Adrian}},
  issn         = {{0169-4332}},
  journal      = {{Applied Surface Science}},
  pages        = {{147671}},
  title        = {{{Effect of nanoscale surface topography on the adsorption of globular proteins}}},
  doi          = {{10.1016/j.apsusc.2020.147671}},
  volume       = {{535}},
  year         = {{2021}},
}

@article{22688,
  author       = {{Meinderink, Dennis and Kielar, C. and Sobol, O. and Ruhm, L. and Rieker, F. and Nolkemper, K. and Orive, A.G. and Ozcan, O. and Grundmeier, Guido}},
  issn         = {{0143-7496}},
  journal      = {{International Journal of Adhesion and Adhesives}},
  title        = {{{Effect of PAA-induced surface etching on the adhesion properties of ZnO nanostructured films}}},
  doi          = {{10.1016/j.ijadhadh.2021.102812}},
  year         = {{2021}},
}

@article{22697,
  author       = {{Knust, Steffen and Ruhm, Lukas and Kuhlmann, Andreas and Meinderink, Dennis and Bürger, Julius and Lindner, Jörg K. N. and Arcos de Pedro, Maria Teresa and Grundmeier, Guido}},
  issn         = {{0377-0486}},
  journal      = {{Journal of Raman Spectroscopy}},
  pages        = {{1237--1245}},
  title        = {{{In situ backside Raman spectroscopy of zinc oxide nanorods in an atmospheric‐pressure dielectric barrier discharge plasma}}},
  doi          = {{10.1002/jrs.6123}},
  year         = {{2021}},
}

@article{22723,
  author       = {{Yoon, Gwanho and Tanaka, Takuo and Zentgraf, Thomas and Rho, Junsuk}},
  issn         = {{0022-3727}},
  journal      = {{Journal of Physics D: Applied Physics}},
  title        = {{{Recent progress on metasurfaces: applications and fabrication}}},
  doi          = {{10.1088/1361-6463/ac0faa}},
  volume       = {{54}},
  year         = {{2021}},
}

@article{22773,
  abstract     = {{<jats:p>Ion beam irradiation of solid surfaces may result in the self-organized formation of well-defined topographic nanopatterns. Depending on the irradiation conditions and the material properties, isotropic or anisotropic patterns of differently shaped features may be obtained. Most intriguingly, the periodicities of these patterns can be adjusted in the range between less than twenty and several hundred nanometers, which covers the dimensions of many cellular and extracellular features. However, even though ion beam nanopatterning has been studied for several decades and is nowadays widely employed in the fabrication of functional surfaces, it has found its way into the biomaterials field only recently. This review provides a brief overview of the basics of ion beam nanopatterning, emphasizes aspects of particular relevance for biomaterials applications, and summarizes a number of recent studies that investigated the effects of such nanopatterned surfaces on the adsorption of biomolecules and the response of adhering cells. Finally, promising future directions and potential translational challenges are identified.</jats:p>}},
  author       = {{Yang, Yu and Keller, Adrian}},
  issn         = {{2076-3417}},
  journal      = {{Applied Sciences}},
  pages        = {{6575}},
  title        = {{{Ion Beam Nanopatterning of Biomaterial Surfaces}}},
  doi          = {{10.3390/app11146575}},
  volume       = {{11}},
  year         = {{2021}},
}

@unpublished{22807,
  abstract     = {{Photonic quantum technologies [1] with applications in quantum
communication, sensing as well as quantum simulation and computing, are on the
verge of becoming commercially available. One crucial building block are
tailored nanoscale integratable quantum light sources, matching the specific
needs of use-cases. Several different approaches to realize solid-state quantum
emitters [2] with high performance [3] have been pursued. However, the
properties of the emitted single photons are always defined by the individual
quantum light source and despite numerous quantum emitter tuning
techniques [4-7], scalability is still a major challenge. Here we show an
emitter-independent method to tailor and control the properties of the single
photon emission. We demonstrate a laser-controlled down-conversion process from
an excited state of a quantum three-level system [8]. Starting from a biexciton
state, a tunable control laser field defines a virtual state in a stimulated
process. From there, spontaneous emission to the ground state leads to
optically controlled single photon emission. Based on this concept, we
demonstrate energy tuning of the single photon emission with a control laser
field. The nature of the involved quantum states furthermore provides a unique
basis for the future control of polarization and bandwidth, as predicted by
theory [9,10]. Our demonstration marks an important step towards tailored
single photon emission from a photonic quantum system based on quantum optical
principles.}},
  author       = {{Jonas, B. and Heinze, D. and Schöll, E. and Kallert, P. and Langer, T. and Krehs, S. and Widhalm, A. and Jöns, K. D. and Reuter, D. and Schumacher, S. and Zrenner, Artur}},
  booktitle    = {{arXiv:2105.12393}},
  title        = {{{Nonlinear down-conversion in a single quantum dot}}},
  year         = {{2021}},
}