Experiments show >1000 W -1 m -1 gain and <100 kHz linewidths in silicon nitride waveguides, indicating effective forward intermodal interactions with acoustic waves.
Suspended triple-core waveguides enable strong forward inter-modal interactions with the fundamental acoustic waves on chip. By optimizing the acousto-optic interaction, >1000 W -1 m -1 gain and <100 kHz linewidths are observed in suspended silicon nitride.
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Xu et al. (2025) studied this question.
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