Strong electromagnetic field localization near the surface of hemicylindrical particles |
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| Authors: | Ibrahim Mahariq Ibrahim H Giden Hamza Kurt Oleg V Minin Igor V Minin |
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| Institution: | 1.Department of Electrical and Electronics Engineering,University of Turkish Aeronautical Association,Ankara,Turkey;2.Department of Electrical and Electronics Engineering,TOBB University of Economics and Technology,Ankara,Turkey;3.National Research Tomsk State University,Tomsk,Russia |
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| Abstract: | We theoretically study the forward and backward plane wave illuminations of hemicylindrical dielectric particles with different radii and refractive indices. Near field effects providing strong field enhancement and narrow beam width are obtained from hemicylindrical particles, which can be associated with whispering gallery modes (WGMs) and photonic nano-jets (PNJs). It should be noted that existence of PNJ and WGM effects depending on forward/backward light illuminations is studied for the first time in all-dielectric hemicylindrical particles. Compared to dielectric cylinders, hemicylindrical aided PNJs show relatively small influences of WGM regime, when exists, to PNJ behavior. Under the backward excitation, on the other hand, typical nano-jet is produced. The designed hemicylindrical structure could be implemented in high-resolution optical imaging and sensing applications. |
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