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Khromova, Irina

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https://academica-e.unavarra.es/handle/2454/49337

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Khromova

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Irina

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Ingeniería Eléctrica y Electrónica

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0000-0002-9977-3411

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9208

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2012 - 20163
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Now showing 1 - 3 of 3
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    PublicationOpen Access
    Tunable beam steering enabled by graphene metamaterials
    (Optical Society of America, 2016) Orazbayev, Bakhtiyar; Beruete Díaz, Miguel; Khromova, Irina; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
    We demonstrate tunable mid-infrared (MIR) beam steering devices based on multilayer graphene-dielectric metamaterials. The effective refractive index of such metamaterials can be manipulated by changing the chemical potential of each graphene layer. This can arbitrarily tailor the spatial distribution of the phase of the transmitted beam, providing mechanisms for active beam steering. Three different beam steerer (BS) designs are discussed: a graded-index (GRIN) graphene-based metamaterial block, an array of metallic waveguides filled with graphene-dielectric metamaterial and an array of planar waveguides created in a graphene-dielectric metamaterial block with a specific spatial profile of graphene sheets doping. The performances of the BSs are numerically analyzed, showing the tunability of the proposed designs for a wide range of output angles (up to approximately 70°). The proposed graphene-based tunable beam steering can be used in tunable transmitter/receiver modules for infrared imaging and sensing.
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    PublicationOpen Access
    Dipolar resonances in conductive carbon micro-fibers probed by near-field terahertz spectroscopy
    (AIP Publishing, 2015) Khromova, Irina; Navarro Cía, Miguel; Brener, I.; Reno, J. L.; Ponomarev, A.; Mitrofanov, Oleg; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
    We observe dipole resonances in thin conductive carbon micro-fibers by detecting an enhanced electric field in the near-field of a single fiber at terahertz (THz) frequencies. Time-domain analysis of the electric field shows that each fiber sustains resonant current oscillations at the frequency defined by the fiber’s length. Strong dependence of the observed resonance frequency and degree of field enhancement on the fibers’ conductive properties enable direct non-contact probing of the THz conductivity in single carbon micro-fibers. We find the conductivity of the fibers to be within the range of 1–5 10 4 S/m. This approach is suitable for experimental characterization of individual doped semiconductor resonators for THz metamaterials and devices.
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    PublicationOpen Access
    Evanescently fed electromagnetic band-gap horn antennas and arrays
    (IEEE, 2012) Khromova, Irina; Ederra Urzainqui, Íñigo; Teniente Vallinas, Jorge; Gonzalo García, Ramón; Esselle, Karu P.; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
    The design of a horn antenna based on electromagnetic band-gap structures (EBGs) and fed by evanescent fields in the containing periodic structure is presented. Such all-dielectric antennas can form compact arrays and provide a promising solution for millimeter, submillimeter, and terahertz (THz) devices. An evanescently fed EBG horn antenna design based on a woodpile structure and operating at frequencies around 110 GHz is presented, together with experimental and simulation results for an analogous scaled-up prototype antenna operating in the Ku-band. It exhibits a 9%bandwidth and an average level of maximum gain approximately equal to 14.6 dBi.