Ultrawide‐Band Unidirectional Surface Plasmon Polariton Launchers

An ultrawide-band unidirectional surface plasmon polariton launcher is realized by combining plasmonic bandgap engineering and linear interference effects. This device performs excellently over a wavelength range from 690 to 900 nm, which is enlarged 210-fold compared with previous reports, together with a large average extinction ratio of 30 dB and an average launching efficiency ratio of 1.0. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.