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    Item type:Publication, Access status: without files ,
    Radial bound states in the continuum
    (2021-05-01)
    Kuhner, Lucca
    ;
    Ren, Haoran
    ;
    Berte, Rodrigo
    ;
    Maier, Stefan A.
    ;
    Kivshar, Yuri S.
    We experimentally demonstrate a new platform for enhanced light-matter interaction and sensing based on radial bound states in the continuum, which are supported in rings of symmetry-broken dielectric resonators with an ultracompact footprint.
    Publicationtype: Conference Paper
      4
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    Light stopping by reflection from a moving index front
    (2021-05)
    Gaafar, Mahmoud Abdelaziz
    ;
    Holtorf, Jannik
    ;
    Eich, Manfred
    ;
    Petrov, Alexander
    Nonlinearly generated refractive index fronts in waveguides can change the signal frequency and wavenumber leading to the indirect transitions. Here, we discuss how dynamic light stopping and pulse time reversal can be implemented in dispersive waveguides via these transitions. Our scheme, in contrast to previous concepts of light stopping and time reversal, is not limited by a strict phase matching condition and does not require local index variations, thus, can manipulate broadband signals in a single step process. The presented results are experimentally feasible using existing photonic waveguides technologies.
    Publicationtype: Conference Paper
      50
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    Time lens induced by optical pushbroom effect
    (2021-05)
    Gaafar, Mahmoud Abdelaziz
    ;
    Renner, Hagen
    ;
    Eich, Manfred
    ;
    Petrov, Alexander
    We show analytically and by numerical simulation an on-chip time lens based on the optical pushbroom effect. Furthermore, we demonstrate this effect inside a silicon Bragg grating waveguide. A fast free carriers front generated inside the waveguide collects and traps the energy of a signal wave with smaller group velocity tuned near to the band gap of the waveguide with hyperbolic dispersion. The energy of the signal wave is accumulated inside the front and distributed in frequency. The presented effect can be utilized to compress signals in time and space.
    Publicationtype: Conference Paper
      49
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    Optical Properties of the Refractory Metals at High Temperatures
    (2021-05)
    Chirumamilla, Manohar
    ;
    Arya, Mahima
    ;
    Ganguly, Ankita
    ;
    Rout, Surya Snata
    ;
    Krishnamurthy, Gnanavel Vaidhyanathan
    We measure and compare the optical properties of thin refractory metal films (TiN, W, Mo and Ir) at temperatures up to 1000 °C. In-situ ellipsometry is used to measure the optical constants. Refractory metals show long-term structural stability at 1000 °C for 120 h.
    Publicationtype: Conference Paper
      48
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    Item type:Publication, Access status: without files ,
    Radial bound states in the continuum
    (Optica Publishing Group, 2021)
    Kühner, Lucca
    ;
    Ren, Haoran
    ;
    Berté, Rodrigo
    ;
    Maier, Stefan A.
    ;
    Kivshar, Yuri S.
    We experimentally demonstrate a new platform for enhanced light-matter interaction and sensing based on radial bound states in the continuum, which are supported in rings of symmetry-broken dielectric resonators with an ultracompact footprint.
    Publicationtype: Conference Paper
      6