Journal: Advanced Optical Materials

Abbreviation

Adv. Optical Mater.

Publisher

Wiley

Journal Volumes

ISSN

2195-1071

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2016 - 2019102020 - 20217
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Publications 1 - 10 of 17
  • Optical Metasurfaces: Evolving from Passive to Adaptive
    Item type: Review Article
    Hail, Claudio U.; Michel, Ann-Katrin Ursula; Poulikakos, Dimos; et al. (2019)
    Advanced Optical Materials
  • Polaron and Spin Dynamics in Organic-Inorganic Lead Halide Perovskite Nanocrystals
    Item type: Journal Article
    Shrivastava, Megha; Bodnarchuk, Maryna I.; Hazarika, Abhijit; et al. (2020)
    Advanced Optical Materials
    Long-lived carrier population and spin-based behavior in lead halide perovskite nanocrystals (NCs) are extremely interesting for implementing photovoltaic devices with efficiencies exceeding the Shockley-Queisser limit and quantum information processing, respectively. However, a comprehensive understanding of polaron-mediated charge carrier interactions and an accurate description of the spin-polarized states for spintronics are still lacking. Herein, the carrier and spin interactions are studied under controlled conditions in FAPbI(3)and Cs(0.01)FA(0.99)Pb(Br0.11I0.89)(3)NCs through ultrafast transient absorption (TA) spectroscopy. At early timescales, TA spectrum shows an asymmetric derivative feature originating from the hot carrier-induced spectral redshift in FAPbI(3)NCs (55 +/- 3 meV) and Cs(0.01)FA(0.99)Pb(Br0.11I0.89)(3)NCs (54 +/- 2 meV) at the bandedges that stabilizes to 9 +/- 1 and 11 +/- 2 meV, respectively, at 1 ps due to the polaron formation. The kinetic analysis indicates that the polaron populations in FAPbI(3)and Cs(0.01)FA(0.99)Pb(Br0.11I0.89)(3)NCs decay with an average lifetime of 657 +/- 34 and 532 +/- 28 ps, respectively. The circular polarization-resolved TA reveals that polaron formation can control spin relaxation in NCs, thus providing a powerful tool to explore the development of their prospective applications in spintronics.
  • Perovskite Quantum Dots for Super-Resolution Optical Microscopy: Where Strong Photoluminescence Blinking Matters
    Item type: Journal Article
    Feld, Leon; Shynkarenko, Yevhen; Krieg, Franziska; et al. (2021)
    Advanced Optical Materials
    Blinking nanoscale emitters, typically single molecules, are employed in single-molecule localization microscopy (SMLM), such as direct stochastic optical reconstruction microscopy (dSTORM), to overcome Abbe's diffraction limit, offering spatial resolution of few tens of nanometers. Colloidal quantum dots (QDs) feature high photostability, ultrahigh absorption cross-sections and brightness, as well as wide tunability of the emission properties, making them a compelling alternative to organic molecules. Here, CsPbBr3 nanocrystals, the latest addition to the QD family, are explored as probes in SMLM. Because of the strongly suppressed QD photoluminescence blinking (ON/OFF occurrence higher than 90%), it is difficult to resolve emitters with overlapping point-spread functions by standard dSTORM methods due to false localizations. A new workflow based on ellipticity filtering efficiently identifies false localizations and allows the precise localization of QDs with subwavelength spatial resolution. Aided by Monte-Carlo simulations, the optimal QD blinking dynamics for dSTORM applications is identified, harnessing the benefits of higher QD absorption cross-section and the enhanced QD photostability to further expand the field of QD super-resolution microscopy toward sub-nanometer spatial resolution.
  • Barium Titanate Nanostructures and Thin Films for Photonics
    Item type: Review Article
    Karvounis, Artemios; Timpu, Flavia; Vogler-Neuling, Viola V.; et al. (2020)
    Advanced Optical Materials
    Barium titanate (BaTiO3) is a synthetic crystal used in electromechanical transducers and multilayer ceramic capacitors. Since it is not available in nature, a variety of growth methods has been employed to produce in large scale, with high quality and low‐cost. BaTiO3, as a metal oxide meets practical requirements such as physical hardness, stability and tunable optoelectronic properties. The plethora of characteristics renders it functional in diverse fields of applications from energy harvesting to biophotonics. Related to optical properties, it is a dielectric material from the near ultraviolet to the near‐infrared part of the spectrum with low optical losses and relatively high refractive index. The strong second‐order nonlinear response has resulted in several breakthroughs in bioimaging, while its intrinsic electrooptic response is among the highest within the existing materials. The properties of the BaTiO3 may also be modified by doping or hybridization with other materials. This review presents the basic optoelectronic properties of BaTiO3, reports on the recent advances in BaTiO3 nanostructures and thin films related to photonic applications, and oversees photonic technologies that may benefit from this material platform in the near future.
  • Structural Color Sensors with Thermal Memory: Measuring Functional Properties of Ti-Based Nitrides by Eye
    Item type: Journal Article
    Schnabel, Volker; Spolenak, Ralph; Doebeli, Max; et al. (2018)
    Advanced Optical Materials
  • High‐Efficiency, Extreme‐Numerical‐Aperture Metasurfaces Based on Partial Control of the Phase of Light
    Item type: Journal Article
    Hail, Claudio U.; Poulikakos, Dimos; Eghlidi, Hadi (2018)
    Advanced Optical Materials
  • Magnetic Manipulation of Spontaneous Emission from Inorganic CsPbBr3 Perovskites Nanocrystals.
    Item type: Journal Article
    Pavliuk, Mariia V.; Fernandes, Daniel L.A.; El-Zohry, Ahmed M.; et al. (2016)
    Advanced Optical Materials
  • Design Parameters for Phase-Change Materials for Nanostructure Resonance Tuning
    Item type: Journal Article
    Michel, Ann-Katrin U.; Wuttig, Matthias; Taubner, Thomas (2017)
    Advanced Optical Materials
  • Electro‐Optic Metasurfaces Based on Barium Titanate Nanoparticle Films
    Item type: Journal Article
    Karvounis, Artemios; Vogler-Neuling, Viola V.; Richter, Felix U.; et al. (2020)
    Advanced Optical Materials
    Metal‐oxides are promising candidates to substitute silicon in intra‐chip optical interconnects, as they exhibit great electric field tuning capabilities. The development of crystal ion slicing of thin films from bulk crystals and the advances over epitaxial growth have allowed the integration of metal‐oxides on a single chip. In terms of performance, they possess strong electro‐optic response over broad bandwidths across near‐infrared. However, lattice and thermal expansion coefficient mismatch limits the compatibility with available substrates and other materials, while physical hardness makes high quality nanostructures difficult to implement. Here, a novel concept of electro‐optic (EO) switching is introduced: an adjacent BaTiO3 nanoparticle film to a plasmonic metasurface provides reflection changes up to 0.15% under 4 V of control signal for modulation frequencies up to 20 MHz, in the near‐infrared. The nanoparticle films show EO coefficients (37.04 ± 25.6 pm V−1) comparable to lithium niobate crystals, are deposited uniformly over large scale and on any type of substrate, while retain optical nonlinear properties (e.g. second‐harmonic generation). Photonic nanostructures such as metasurfaces incorporated with nanoparticle films can harness the multifunctional properties of metal‐oxides such as BaTiO3 to form a new family of switchable nano‐devices across the entire visible to near‐infrared part of the spectrum.
  • Superradiantly Limited Linewidth in Complementary THz Metamaterials on Si-Membranes
    Item type: Journal Article
    Keller, Janine; Haase, Johannes; Appugliese, Felice; et al. (2018)
    Advanced Optical Materials
Publications 1 - 10 of 17