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    Optical properties of nanoporous gold and their change upon electrochemical oxidation
    (META Conference, 2025-07)
    Pfeiffer, Maurice
    ;
    Wu, Xinyan
    ;
    Eich, Manfred
    ;
    Petrov, Alexander
    Nanoporous gold shows a strong change of color upon electrochemical oxidation. This can result from a reduced volume of plasmonic gold, dielectric coating on the gold surface or an increase of electron collision frequency. Using brute-force simulations we identify the contribution of these effects.
    Publicationtype: Conference Paper
      56
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    Permittivity-driven ultrafast photonic bound states in the continuum
    (2025-07)
    Tittl, Andreas
    Permittivity-driven bound states in the continuum enable all-dielectric metasurfaces that overcome geometrical symmetry-breaking limits. Recent demonstrations reveal high-Q resonances with exceptional spectral control, dynamic tunability with electro-optical polymers, and all-optical generation via ultrafast pulses, enabling promising applications in adaptive photonics and high-speed modulators.
    Publicationtype: Conference Paper
      9
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    Chiral polaritons in bulk van der Waals metasurfaces
    (2025-07)
    Antonov, A. A.
    ;
    Heimig, C.
    ;
    Gorkunov, M. V.
    ;
    Kivshar, Y. S.
    ;
    Tittl, Andreas
    We analyze a maximally chiral metasurface composed of van der Waals (vdW) material within the strong light-matter coupling regime. We demonstrate that, due to specific photonic eigenstates – chiral quasi-bound state in the continuum (quasi-BIC) uncoupled from light of specific circular polarization, chiral self-hybridized exciton-polaritons of certain handedness are formed.
    Publicationtype: Conference Paper
      18
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    Environmental permittivity-asymmetric BIC metasurfaces with electrical reconfigurability
    (META Conference, 2025-07)
    Hu, Haiyang
    ;
    Lu, Wenzheng
    ;
    Antonov, Alexander
    ;
    Berté, Rodrigo
    ;
    Maier, Stefan A.
    In nanophotonics, we introduce permittivity-driven quasi-BICs (ε-qBICs), achieved by embedding identical resonators in a refractive index-contrasting medium. Integrating electro-optic polyaniline enables electrically reconfigurable ε-qBICs with rapid switching and durability, advancing tunable metasurfaces for on-chip optics, sensing, and adaptive photonic applications without modifying resonator geometry.
    Publicationtype: Conference Paper not in Proceedings
      11
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    Water-based cylindrical metamaterials with radial anisotropy for electric field enhancement and suppression
    (META Conference, 2025-07)
    Brandt, Julia
    ;
    Renner, Hagen
    ;
    Langer, Dominik
    ;
    Eich, Manfred
    ;
    Kölpin, Alexander
    In this paper, we study how a cylindrical shell made from a radially anisotropic material can modify the electric field inside an isotropic core, either by enhancing or suppressing it. We present a water-air metamaterial that enhances electric fields by 10 dB across a broad frequency range.
    Publicationtype: Conference Paper
      100
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    Geometric approach based on optimal toric packings for photonic crystals and metamaterials design
    (META Conference, 2025)
    Itin, Alexander
    We introduce new classes of nanostructures—optimal toric packings of particles and their Voronoi tessellations—that exhibit remarkable properties for photonic and potentially for plasmonic/phononic crystals design. These structures connect the classical problem of optimal packings on tori with the development of optimized photonic architectures.
    Publicationtype: Conference Paper
      33  15
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    BICs and quasi-BICs in unpatterned media
    (2025-07)
    Berté, R.
    ;
    Possmayer, T.
    ;
    Tittl, Andreas
    ;
    Menezes, L. S.
    ;
    Maier, S. A.
    All-optical permittivity symmetry breaking leads to tailored ultrafast resonances in a Si thin film.
    Publicationtype: Conference Paper
      13
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    N-heterocyclic carbene as robust and conductive linkages to couple gold nanoparticles and conductive polymers
    (META Conference, 2025-07)
    Sun, Ningwei
    ;
    Lissel, Franziska
    N-heterocyclic carbene (NHC) anchors enable electron delocalization over the gold/conductive polymer (CP) interface, resulting in an improved conductivity. Here we developed a new class of real hybrid nanocomposites using NHC to coupling AuNPs and CPs, including small Au NP@NHC-CP by bottom-up methods and large Au NP@NHC-CP by top-down methods.
    Publicationtype: Conference Paper
      87