Huang S.-Y.Hsiao H.-H.Chang Y.-T.Chen H.-H.Jiang Y.-W.Huang H.-F.Chang P.-E.Chang H.-C.HUNG-CHUN CHANGSI-CHEN LEEHUI-HSIN HSIAO2022-09-192022-09-192011https://www.scopus.com/inward/record.uri?eid=2-s2.0-79959610757&doi=10.1063%2f1.3599851&partnerID=40&md5=4de4492d7f5689a7881e39e2ec1fd837https://scholars.lib.ntu.edu.tw/handle/123456789/621139The transmission spectra of bowtie aperture consisting of opposing triangular holes arranged in rectangular array on silver/silicon structure were investigated. It is found that the second order surface plasmon polaritons mode is much stronger than the fundamental one. In addition, by increasing the separation and angles of the tips or silver film thickness, the second order modes decrease gradually. These phenomena suggest magnetic field coupling between metal tips which results in higher order mode enhancement. © 2011 American Institute of Physics.Aperture arrays; Bowtie aperture; Extraordinary transmission; Higher-order modes; Magnetic field coupling; Metal tip; Mid-infrared regions; Rectangular arrays; Second order modes; Second orders; Silver film; Surface plasmon polaritons; Transmission spectrums; Triangular holes; Electromagnetic wave polarization; Magnetic fields; Metallic films; Silverjournal article10.1063/1.35998512-s2.0-79959610757