Nanoimprinted reflecting gratings for long-range surface plasmon polaritons
We present a novel design, fabrication, and characterization of reflecting gratings for long-range surface plasmon polaritons (LR-SPPs) at telecom wavelengths. LR-SPP waveguides consisting of a thin (12nm) gold film embedded in a thick (45?m) layer of dielectric polymer cladding are structured by nanoimprint lithography to form a reflecting Bragg grating. By performing spectrally resolved transmission measurements pronounced Bragg grating behaviour is observed, with the transmission dip increasing (up to ?12dB) with the increasing grating length.
reflecting grating long-range surface plasmon polaritons nanoimprint lithography