Sub-picosecond biphasic ultrafast all-optical switching in ultraviolet band.

ABSTRACT: Ultrafast all-optical control has been a subject of wide-spread attention as a method of manipulating optical fields using light excitation on extremely short time scales. As a fundamental form of ultrafast all-optical control, all-optical switching has achieved sub-picosecond switch speeds in the visible, infrared, and terahertz spectral regions. However, due to the lack of suitable materials, ultrafast all-optical control in the ultraviolet range remains in its early stages. We demonstrate sub-picosecond all-optical switching in the ultraviolet wavelength by designing a Si₃N₄-ITO Fabry-Pérot resonance aligns with the edge of the interband transition region of ITO. The response time of 500 fs achieved at a pump fluence as low as 0.17 mJ/cm². Notably, unlik

SUBMITTER: Dong X 

PROVIDER: S-EPMC11636473 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature