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2013). Unidirectional coupling of surface plasmons with ultrabroadband and wide-angle efficiency: Abstract. A cascaded-grating coupling scheme for unidirectionally coupling and launching surface plasmons from free-space light with ultra-broadband and wide-angle efficiency is proposed and theoretically investigated, and the potential applications in sensing are discussed. The cascaded sub-gratings of different periods couple the incident light over a relatively wide wavelength and angular rangedoi:10.1088/1367-2630/15/11/113040 fatcat:odf4wcyipbdazd22ftpg2itmli