Tunable interference of light behind subwavelength apertures

Feng Gao; De Li; Ru-Wen Peng; Qing Hu; Kuang Wei; Wang, Q. J.; Zhu, Y. Y.; Mu Wang
July 2009
Applied Physics Letters;7/6/2009, Vol. 95 Issue 1, p011104
Academic Journal
We demonstrate in this letter that electromagnetic waves passing through the subwavelength apertures on a silver film interfere with each other in the airgap behind the apertures. Depending on the width of the airgap, either constructive or destructive interference occurs. It is shown that constructive interference enhances the extraordinary optical transmission and evidently improves the quality factor, whereas destructive interference weakens the extraordinary optical transmission. We suggest that our results provide a unique approach to construct plasmonic structures and devices.


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