Formation and evolution mechanisms of transmission dips in a compound metallic grating with perpendicular cut |
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| Authors: | Guangtao Cao Zhimin Liu Haiqing Xu Shiping Zhan Caini Wu |
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| Affiliation: | 1. College of Physics Science and Technology , Central South University , Changsha 410083 , P.R. China;2. College of Materials Science and Engineering , Central South University , Changsha 410083 , P.R. China;3. College of Physics Science and Technology , Central South University , Changsha 410083 , P.R. China |
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| Abstract: | The transmission properties are investigated of a compound metallic grating in which each period is comprised of two slits but only one is engraved with a perpendicular cut are investigated. Based on Fabry–Parot (FP) resonances and phase resonances, the formation and evolution mechanisms of transmission dips are analyzed. We show that there is a corresponding relationship between the depth of transmission dips and the phase difference of magnetic fields in adjacent slits. In particular, the absorption intensity is powerfully enhanced as phase resonances take place and absorption peaks corresponding to transmission dips exhibit blue-shift or red-shift with an increase in depth of the perpendicular cut. We also show that the variation of transmission peaks and bandwidth of transmission dips can be interpreted by a compound of the transmission spectra of two corresponding simple gratings. |
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| Keywords: | compound metallic grating transmission dip resonance |
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