Photonics / Fotonik

Permanent URI for this collectionhttps://hdl.handle.net/11147/2590

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Author: search.filters.author.Karademir, Ertuğrul

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  • Article
    Citation - WoS: 5
    Citation - Scopus: 5
    Large Rabi Splitting of Mixed Plasmon-Exciton States in Small Plasmonic Moire Cavities
    (The Optical Society, 2020) Ateş, Simge; Karademir, Ertuğrul; Balcı, Sinan; Kocabaş, Coşkun; Aydınlı, Atilla; Ateş, Simge; Ateş, Simge; Karademir, Ertuğrul; Karademir, Ertuğrul; Balcı, Sinan; Balcı, Sinan; Kocabaş, Coşkun; Kocabaş, Coşkun; Aydınlı, Atilla; Aydınlı, Atilla
    We report on exciton-plasmon coupling in metallic moire cavities, both numerically and experimentally. Moire cavities fabricated using double exposure laser interference lithography were filled with a molecular dye, J-aggregate. Polarization-dependent spectroscopic reflection measurements supported by simulations reveal strong coupling of organic dye excitons with cavity modes of the plasmonic moire cavities. An anti-crossing at zero detuning, a clear indication of strong coupling, has been observed when the excitonic absorption band resonates with the cavity mode. LargeRabi splitting energies owing to the strong coupling of plasmons and excitons are clearly observed. (C) 2020 Optical Society of America
  • Article
    Citation - WoS: 134
    Citation - Scopus: 136
    Electrically Switchable Metadevices Via Graphene
    (American Association for the Advancement of Science, 2018) Balcı, Osman; Kakenov, Nurbek; Karademir, Ertuğrul; Balcı, Sinan; Çakmakyapan, Semih; Polat, Emre O.; Çağlayan, Hümeyra; Özbay, Ekmel; Kocabaş, Çoşkun
    Metamaterials bring subwavelength resonating structures together to overcome the limitations of conventional materials. The realization of active metadevices has been an outstanding challenge that requires electrically reconfigurable components operating over a broad spectrum with a wide dynamic range. However, the existing capability of metamaterials is not sufficient to realize this goal. By integrating passive metamaterials with active graphene devices, we demonstrate a new class of electrically controlled active metadevices working in microwave frequencies. The fabricated active metadevices enable efficient control of both amplitude (>50 dB) and phase (>90°) of electromagnetic waves. In this hybrid system, graphene operates as a tunable Drude metal that controls the radiation of the passive metamaterials. Furthermore, by integrating individually addressable arrays of metadevices, we demonstrate a new class of spatially varying digital metasurfaces where the local dielectric constant can be reconfigured with applied bias voltages. In addition, we reconfigure resonance frequency of split-ring resonators without changing its amplitude by damping one of the two coupled metasurfaces via graphene. Our approach is general enough to implement various metamaterial systems that could yield new applications ranging from electrically switchable cloaking devices to adaptive camouflage systems.