Metasurface for ultrashort pulse compression

Yao-Wei Huang^1*

¹Department of Photonics, National Yang Ming Chiao Tung University, Hsinchu, Taiwan

* Presenter:Yao-Wei Huang, email:ywh@nycu.edu.tw

We experimentally demonstrate the dispersion of silicon nanopillar arrays such that they temporally reshape pulses upon transmission using slow light effects and act as ultrashort laser pulse compressors. The metasurface induce anomalous group delay dispersion in the visible to near-infrared spectral region around 800 nm wavelength over an 80 nm bandwidth. We characterize the performance of metasurface in the spectral domain via white light interferometry and directly demonstrate the temporal compression of femtosecond laser pulses. Applying these dispersion-engineered metasurfaces to conventional optics renders them ultrashort pulse compatible and suitable for a wide range of applications.

Keywords: Metasurfaces, Slow light, Dispersion