Slow light nanocoatings for ultrashort pulse compression

Marcus Ossiander*, Yao-Wei Huang, Wei Ting Chen, Zhenhao Wang, Xinghui Yin, Yousef Ahmed Ibrahim, Martin Schultze, Federico Capasso*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Transparent materials do not absorb light but have profound influence on the phase evolution of transmitted radiation. One consequence is chromatic dispersion, i.e., light of different frequencies travels at different velocities, causing ultrashort laser pulses to elongate in time while propagating. Here we experimentally demonstrate ultrathin nanostructured coatings that resolve this challenge: we tailor 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 coatings 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 arrays’ performance in the spectral domain via white light interferometry and directly demonstrate the temporal compression of femtosecond laser pulses. Applying these coatings to conventional optics renders them ultrashort pulse compatible and suitable for a wide range of applications.
Original languageAmerican English
Article number6518
JournalNature Communications
StatePublished - 11 Nov 2021


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