Second-Order Nonlinear Circular Dichroism in Square Lattice Array of Germanium Nanohelices
Saerens G, Ellrott G, Pashina O, Deriy I, Krstic V, Petrov M, Chekhova M, Grange R (2024)
Publication Language: English
Publication Type: Journal article
Publication year: 2024
Journal
Book Volume: 11
Pages Range: 3630-3635
Journal Issue: 9
DOI: 10.1021/acsphotonics.4c00721
Abstract
Second-harmonic generation (SHG) is prohibited in centrosymmetric crystals such as silicon or germanium due to the presence of inversion symmetry. However, the structuring of such materials makes it possible to break the inversion symmetry, thus achieving generation of second-harmonic. Moreover, various symmetry properties of the resulting structure, such as chirality, also influence the SHG. In this work, we investigate second-harmonic generation from an array of nanohelices made of germanium. The intensity of the second-harmonic displayed a remarkable enhancement of over 100 times compared to a nonstructured Ge thin film, revealing the influence of interaction between nanohelices. In particular, nonlinear circular dichroism, characterized through the SHG anisotropy factor gSHG-CD, changed its sign not only with the helix handedness but also with its density as well. We believe that our discoveries will open up new paths for the development of nonlinear photonics based on metamaterials and metasurfaces made of centrosymmetric materials.
Authors with CRIS profile
Günter Ellrott
Professur für Angewandte Physik
Vojislav Krstic
Professur für Angewandte Physik
Maria Chekhova
Professur für Optik
Involved external institutions
Eidgenössische Technische Hochschule Zürich (ETHZ) / Swiss Federal Institute of Technology in Zurich
Switzerland (CH)
ITMO University / Национальный исследовательский университет ИТМО
Russian Federation (RU)
Switzerland (CH)
ITMO University / Национальный исследовательский университет ИТМО
Russian Federation (RU)
How to cite
APA:
Saerens, G., Ellrott, G., Pashina, O., Deriy, I., Krstic, V., Petrov, M.,... Grange, R. (2024). Second-Order Nonlinear Circular Dichroism in Square Lattice Array of Germanium Nanohelices. ACS Photonics, 11(9), 3630-3635. https://doi.org/10.1021/acsphotonics.4c00721
MLA:
Saerens, Grégoire, et al. "Second-Order Nonlinear Circular Dichroism in Square Lattice Array of Germanium Nanohelices." ACS Photonics 11.9 (2024): 3630-3635.
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