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A polymeric platform for high-performance coupling to whispering gallery modes of silica microresonators is proposed and validated. The system is based on a low-refractive-index ridge waveguide fabricated with widely used SU8 and PDMS optical polymers. The waveguide is integrated with grating couplers for a simple fiber-to-chip connection. The coupling capabilities of the proposed platform were characterized using microsphere and microbubble resonators of different sizes. The experimental results demonstrate coupling efficiency in excess of 99% with microsphere and microbubble resonators having intrinsic quality factors in excess of 107 and 106, respectively. This performance is comparable with conventional fiber taper couplers and enables simple on-chip packaging of silica microresonators.
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Persichetti et al. (2026) studied this question.
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