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Schematic illustrations of (a) an asymmetric VIM nanoantenna and (b) a periodic VIM metagrating for the IMT assisted switching of directionally launched SPPs. The left navy arrow and the right orange arrow denote directionally launched SPPs when the VIM nanoantenna is in the insulator and the metal phases, respectively. Light with transverse-magnetic (TM) polarization illuminates normally on the proposed schemes.
