Excitations of surface plasmon polaritons in double layer metal grating structures

N. Anttu*, Z. Q. Guan, U. Håkanson, H. X. Xu, H. Q. Xu

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)


We study the light scattering properties of double layer gratings (DLGs) made from Au on SiO 2 substrates. It is found that surface plasmon polaritons (SPPs) can be excited in the DLGs for a separation of up to 150 nm between the two Au grating layers and the collective reflectance spectra exhibit a strong resonant peak and a closely lying dip as a result of the surface plasmon polariton excitations. It is also found that the angle-resolved specular reflectance spectra show a dip-peak pair structure, while the angle-resolved reflectance spectra of higher diffracted orders show a complementary peak-dip pair structure. Finally, operation of the DLGs for efficient wavelength demultiplexing is proposed and discussed in light of these results.

Original languageEnglish
Article number091111
JournalApplied Physics Letters
Issue number9
Publication statusPublished - 2012
Externally publishedYes
MoE publication typeA1 Journal article-refereed


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