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Optical nanoantennasa ITMO University, Kronverksky Pr. 49, bldg. A, St. Petersburg, 197101, Russian Federation b Nonlinear Physics Centre, Research School of Physical Sciences and Engineering, Australian National University, Mlls Road, Bldng 59, Canberra, 0200, Australia c Aalto University, School of Electrical Engineering, P.O. Box 11000, Aalto, FI-00076, Finland The review is devoted to one of the most rapidly developing area of modern optics — optical nanoantennas. Been formulated a general concept of optical nanoantennas and main characteristics that are relevant to this science direction. Accordingly to our classification two main groups of nanoantennas — metal and dielectric (including semiconductors) — are defined. For both groups a literature review is performed. An overview of non-linear optical nanoantennas is provides. Main practical application of nanoantennas and their perspectives are discussed.
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