Plasmon-enhanced optical nonlinearity for femtosecond all-optical switching

Kuidong Wang, Long Chen, Haijuan Zhang, Hui Hsin Hsiao, Din Ping Tsai, Jie Chen

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Ultrafast all-optical switching in metals can be an efficient way for high-speed active photonic devices. However, with the improvement in modulation speed, typically by reducing the optical switching pulse width from picoseconds to femtoseconds, the nonlinear optical response of the metal will decrease significantly, which hinders the realization of the sufficient modulation depth at femtosecond optical control. Here, by combining two optical nonlinear enhancement effects of surface plasmon polaritons, including their extreme sensitivity to refractive index change and their capability to induce strong localized optical fields, we have achieved an ∼50-times enhancement in the modulation depth simultaneously with a switching time of ∼75-fs. Such enhancement was found to be independent of the control intensity, which sets a basis for the future application of femtosecond switching at a minimum power.

Original languageEnglish
Article number181102
JournalApplied Physics Letters
Issue number18
Publication statusPublished - Oct 30 2017

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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