Abstract
This letter proposes a long-period grating based on coupling between the long-range surface plasmon mode and a cladding mode of a thin Au film stripe fully buried in polymer SU-8. Periodical surface corrugation and accompanied refractive index variation on the SU-8 upper-cladding were induced by ultraviolet-written technique. This configuration along the Au stripe gives rise to the observation of strong resonance in a 3-mm long periodic grating. A rejection band with a contrast of −23.5 dB at the wavelength 1561 nm was achieved, which can be tuned by $\sim 30$ nm with a temperature change of 6 °C. The grating offers potential applications in surface plasmon waveguide circuits and biosensors.
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