Personal web page : http://iramis.cea.fr/LIDYL/en/Phocea/Pisp/index.php?nom=willem.boutu
Laboratory link : http://iramis.cea.fr/LIDYL/Phocea/Vie_des_labos/Ast/ast_groupe.php?id_groupe=1149
Ultrafast nano-photonics science is emerging thanks to the extraordinary progresses in nano-fabrication and ultrafast laser science. Boosting extremely intense electric fields in nano-structured photonic devices has the potential of creating nano-localized sources of energetic photons or particles opening vast applications in science and in the industry. Optoelectronic is extending to the highly non-linear regime. A recent impact of this capability of controlling the response of above band gap electrons under strong fields is the emergence of high harmonic generation (HHG) in crystal [1-6]. 2D and 3D semiconductors exhibits properties of high electron mobility that allows to drive intense electrons currents coherently in the conduction band. HHG are emitted when those electrons recombine to the valence band. This is a pure above band gap non-perturbative phenomena which occurs efficiently in a few 10s to 100s nanometer exit layer of a crystal and down to an atomically thin layer [5,6]. The strong electron current from which HHG originate can be manipulated in space and time. The project will focus in the strong localization in space, and time, at the single optical cycle scale [7,8], of the harmonic generation process. This control can not only revolutionize attosecond science but also prepare a new generation of ultrafast visible to X-ray opto-electronic devices. Based on the CEA group expertise, experimental and theoretical resources [9-12], the fellow will seek for efficient ways to boost the interaction regime through plasmonic amplification and field confinement for the generation of nanoscale, attosecond high harmonic sources in semiconductors. A specific focus will be on 2D materials like graphene, MoS2 and h-BN. Attosecond pulse generation will also be investigated by using harmonic phase measurements available at CEA (RABBITT, FROG techniques). We will also develop an original nanostructured sample that will allow to generate an attosecond light house inside the semiconductor to isolate single attosecond burst of light.
The research will take place in NanoLight facility, a brand new lab equipped with two laser sources: a 100kHz few optical cycles mid-infrared intense OPCPA (tunable from 1,5 to 3.4 µm wavelength) and a 2µm intense MHz rep/rate few optical cycles fiber laser and and ATTOLAB facility equipped with CEP stable Ti:Sa lasers and attosecond metrology.
1. Ghimire, S. et al. Observation of high-order harmonic generation in a bulk crystal. Nat. Phys. 7, 138–141 (2011).
2. Luu, T. T. et al. Extreme ultraviolet high-harmonic spectroscopy of solids. Nature 521, 498–502 (2015).
3. Ndabashimiye, G. et al. Solid-state harmonics beyond the atomic limit. Nature 534, 520–523 (2016).
4. You, Y. S., et al. Anisotropic high-harmonic generation in bulk crystals. Nat. Phys. 13, 345–349 (2017).
5. Liu H. et al. High-harmonic generation from an atomically thin semiconductor. Nature Physics 13, 262–265 (2017).
6. Yoshikawa, N., et al. High-harmonic generation in graphene enhanced by elliptically polarized light excitation. Science, 356, 736-738 (2017).
7. Hohenleuter, M. et al. Real-time observation of interfering crystal electrons in high-harmonic generation. Nature 523, 572-575 (2015).
8. Langer, F. et al., Lightwave-driven quasiparticle collisions on a subcycle timescale. Nature 533, 225–229 (12 May 2016).
9. Franz et al. submitted to Science Advances arXiv:1709.09153
10. Shaaran, T et al. Nano-Plasmonic near Field Phase Matching of Attosecond Pulses. Scientific Reports 2017, 7, 6356.
11. Shi, L. et al. Self-Optimization of Plasmonic Nanoantennas in Strong Femtosecond Fields. Optica 2017, 4, 1038–1043.
12. Nicolas R. et al. Plasmon-Amplified Third Harmonic Generation in metal/dielectric resonators, submitted to ACS Nano (2017).