Abstract
Second-harmonic generation (SHG) and sum-frequency mixing (SFM) are investigated in a two-dimensional photonic crystal (PhC) waveguide formed using a nonlinear optical (NLO) polymer with metallic cladding. The improved waveguide structure of the NLO polymer PhC enables the realization of ultraviolet and blue SHG and SFM radiation at wavelengths ranging from 368 to 400 nm. Large SHG enhancement at 368 nm was observed, originating from resonance between the external pump laser field and a photonic band mode. The SHG enhancement results agree well with the experimental photonic band structure obtained by angle-dependent optical reflectivity and the theoretical structure generated by three-dimensional finite-difference time-domain calculations.
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