Dual resonance in a long-period waveguide grating

摘要

We fabricated a specially designed polymer long-period waveguide grating to demonstrate the phenomenon of dual resonance arising from light coupling between the core mode and a low-order cladding mode of the waveguide. By varying the temperature of the grating, we observed the onset and the evolution of the dual-resonance wavelengths. The separation between the dual-resonance wavelengths was varied by ～ 110 nm with a temperature variation of ～ 10 ℃. The experimental results are explained well by the simulation results.