All-optical switch exploiting Fano resonance and subwavelength light confinement

Quentin Saudan, Dagmawi A. Bekele, Meng Xiong, Kresten Yvind, Michael Galili, Jesper Mørk*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

We propose and experimentally demonstrate a small-mode volume bowtie cavity design for all-optical switching applications using a waveguide-cavity structure that exploits asymmetric Fano resonance lineshapes. The bowtie cavity has a mode volume that is five times smaller than conventional (H0-type) photonic crystal point-defect cavities enabling higher nonlinearity and faster switching. Blue and red-detuned Fano resonant devices based on bowtie cavity designs have been fabricated and characterized. Measured linear transmission spectra have been compared to coupled-mode theory models to extract key parameters such as Q-factors. Furthermore, all-optical switching at 2.5 Gbps have been demonstrated in a wavelength-conversion experiment.

Original languageEnglish
JournalNanophotonics
ISSN2192-8606
DOIs
Publication statusAccepted/In press - 2025

Keywords

  • Extreme light confinement
  • Fano resonance
  • Nanocavity
  • Nanophotonics
  • Optical switching

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