Plasmonic Notch Filter Design Based on Long-range Surface Plasmon Excitation Along Metal Grating
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- Wu, Z., Haus, J.W., Zhan, Q. et al. Plasmonics (2008) 3: 103. doi:10.1007/s11468-008-9062-2
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A single notch plasmonic spectral filter design using evanescently coupled resonant ultrathin metal grating is numerically studied in this article. Due to excitation and coupling of long range surface plasmon between the metal grating nanowires, a deep and narrow reflection spectrum dip can be obtained. Narrower spectral bandwidth is achieved through decreased damping from the existence of large dielectric gaps between the grating nanowires. This physical explanation is confirmed by the field distribution calculation. As an example, a single notch filter design with full width half maximum band width less than 3 nm centered at 808 nm is presented.