High harmonic generation enhanced by magnetic dipole resonance in an amorphous silicon metasurface

0570683 - FZÚ 2024 RIV US eng J - Journal Article
Peterka, P. - Šobáň, Zbyněk - Trojánek, F. - Malý, P. - Kozák, M.
High harmonic generation enhanced by magnetic dipole resonance in an amorphous silicon metasurface.
Optics Express. Roč. 31, č. 4 (2023), s. 6401-6410. ISSN 1094-4087
R&D Projects: GA MŠMT LM2018110; GA MŠMT EF16_013/0001405
Grant - others:OP VVV - LNSM(XE) CZ.02.1.01/0.0/0.0/16_013/0001405
Institutional support: RVO:68378271
Keywords : high harmonic generation (HHG) * amorphous silicon * periodic metasurface * nanostructures * finite-difference time-domain method (FDTD)
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.8, year: 2022
Method of publishing: Open access

We report on the enhancement of high harmonic generation (HHG) yield in a metasurface consisting of amorphous silicon disks in a periodic array on an insulator substrate. The structure was designed and optimized using the finite-difference time-domain method for the maximum enhancement, which reaches the factor of 20-times compared to the unstructred surface. The local field is enhanced by a broadband magnetic resonance mode allowing to use ultrashort laser pulses with Fourier transform limit down to 40 fs. Due to the anisotropic structure of the metasurface, both the local-field enhancement and the HHG yield show strong polarization anisotropy.
Permanent Link: https://hdl.handle.net/11104/0342015