Ultrasmall light-spot transmission in a silicon-core fiber with a bowtie slot structure

Aiguo Sheng*, Makoto Tsubokawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


In this study, we propose a novel silicon-core optical fiber with a bowtie-shaped slot core structure for ultrasmall light-spot transmission. Our simulations show that this dielectric structure creates a nanosized optical spot with the high intensity and transmits it with the low loss. As an example, we obtained an optical spot with the full width at half maximum of 5 nm × 5 nm and a peak power density 167 times higher than that of the surrounding areas. The optical loss because of the scattering in the waveguides and the material absorption was estimated to be 0.58 dB/cm, which is a thousand times less than the optical losses in typical plasmonic waveguides. We believe our proposed structure will contribute to research studies in the field of near-field sensing systems. It also has application potential in nanolithography with high-power lasers.

Original languageEnglish
Pages (from-to)21797-21802
Number of pages6
JournalOptics Express
Issue number17
Publication statusPublished - 2018 Aug 20

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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