Browsing by Author "Ogut, Erdem"

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Citation Count: 0
COMPUTER AIDED DESIGN AND PARAMETRIC ANALYSIS OF RECTANGULAR MICROSTRIP PATCH ANTENNA
(Ieee, 2014) Kucuk, Funda; Ozer, Ali Ziya; Ogut, Erdem; Bolukbas, Deniz
Nowadays, microstrip antennas, with the advantages of low cost, easy to use and easy production have quite wide application area. At this paper, the design criteria of a rectangular microstrip antenna is investigated and computer aided analyses are performed. Two antenna designs have been realised which the operating frequencies are 900 MHz and 1800 MHz respectively and the effects of geometrical properties to the resonance frequencies are analysed. At this work, the effects of coaxial cable feed and microstrip feed, to the input impedance is analysed. The analyses are performed with ANSYS HFSS (R) software and the results are presented
Citation Count: 3
Focusing short-wavelength surface plasmons by a plasmonic mirror
(Optical Soc Amer, 2018) Ogut, Erdem; Yanik, Cenk; Kaya, Ismet Inonu; Ow-Yang, Cleva; Sendur, Kursat
Emerging applications in nanotechnology, such as super-resolution imaging, ultra-sensitive biomedical detection, and heat-assisted magnetic recording, require plasmonic devices that can generate intense optical spots beyond the diffraction limit. One of the important drawbacks of surface plasmon focusing structures is their complex design, which is significant for ease of integration with other nanostructures and fabrication at low cost. In this study, a planar plasmonic mirror without any nanoscale features is investigated that can focus surface plasmons to produce intense optical spots having lateral and vertical dimensions of lambda/9.7 and lambda/80, respectively. Intense optical spots beyond the diffraction limit were produced from the plasmonic parabolic mirror by exciting short-wavelength surface plasmons. The refractive index and numerical aperture of the plasmonic parabolic mirror were varied to excite short-wavelength surface plasmons. Finite-element method simulations of the plasmonic mirror and scanning near-field optical microscopy experiments have shown very good agreement. (C) 2018 Optical Society of America