Photonics / Fotonik
Permanent URI for this collectionhttps://hdl.handle.net/11147/2590
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Article Citation - WoS: 5Citation - Scopus: 5Large 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, AtillaWe 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 AmericaArticle Citation - WoS: 9Citation - Scopus: 9Fourier Transform Plasmon Resonance Spectrometer Using Nanoslit-Nanowire Pair(American Institute of Physics, 2019) Uulu, Doolos Aibek; Ashirov, Timur; Polat, Nahit; Yakar, Ozan; Balcı, Sinan; Kocabaş, CoşkunIn this paper, we present a nanoscale Fourier transform spectrometer using a plasmonic interferometer consisting of a tilt subwavelength slit-nanowire pair on a metallic surface fabricated by the focused ion beam microfabrication technique. The incident broadband light strongly couples with the surface plasmons on the gold surface, and thus, surface plasmon polaritons (SPPs) are generated. The launched SPPs interfere with the incident light and generate high contrast interference fringes in the nanoslit. The transmitted SPPs through the metal nanoslit can decouple into free space and are collected by an objective in the far field. The spectroscopic information of the incidence light is obtained by fast Fourier transform of the fringe pattern of the SPPs. In our design, there is no need for a bulky dispersive spectrometer or dispersive optical elements. The dimension of the spectrometer is around 200 mu m length. Our design is based on inherent coherence of the SPP waves propagating through the subwavelength metal nanoslit structures etched into an opaque gold film.Conference Object Reversible Energy Transfer Between a Single Defect in Hbn and Graphene(OSA - The Optical Society, 2019) Özçeri, Elif; Arı, Ozan; Balcı, Sinan; Kocabaş, Coşkun; Ateş, SerkanWe present a reversible energy transfer between a single defect in hBN and graphene. Dynamic control of Fermi level of graphene results in switching on and off single photon emission from a single quantum emitter. © OSA 2019 © 2019 The Author(s)Article Citation - WoS: 370Citation - Scopus: 398Graphene-Based Adaptive Thermal Camouflage(American Chemical Society, 2018) Salihoğlu, Ömer; Uzlu, Hasan Burkay; Yakar, Ozan; Aas, Shahnaz; Balcı, Osman; Kakenov, Nurbek; Balcı, Sinan; Olçum, Selim; Süzer, Şefik; Kocabaş, CoşkunIn nature, adaptive coloration has been effectively utilized for concealment and signaling. Various biological mechanisms have evolved to tune the reflectivity for visible and ultraviolet light. These examples inspire many artificial systems for mimicking adaptive coloration to match the visual appearance to their surroundings. Thermal camouflage, however, has been an outstanding challenge which requires an ability to control the emitted thermal radiation from the surface. Here we report a new class of active thermal surfaces capable of efficient real-time electrical-control of thermal emission over the full infrared (IR) spectrum without changing the temperature of the surface. Our approach relies on electro-modulation of IR absorptivity and emissivity of multilayer graphene via reversible intercalation of nonvolatile ionic liquids. The demonstrated devices are light (30 g/m2), thin (<50 μm), and ultraflexible, which can conformably coat their environment. In addition, by combining active thermal surfaces with a feedback mechanism, we demonstrate realization of an adaptive thermal camouflage system which can reconfigure its thermal appearance and blend itself with the varying thermal background in a few seconds. Furthermore, we show that these devices can disguise hot objects as cold and cold ones as hot in a thermal imaging system. We anticipate that, the electrical control of thermal radiation would impact on a variety of new technologies ranging from adaptive IR optics to heat management for outer space applications.