Journal
SCIENTIFIC REPORTS
Volume 11, Issue 1, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41598-021-83899-2
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Funding
- Academy of Finland [310985, 323989]
- Sapienza University
- LASAFEM Sapienza Universita di Roma Infrastructure Project [MA31715C8215A268]
- Academy of Finland (AKA) [310985, 323989, 310985, 323989] Funding Source: Academy of Finland (AKA)
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Hybridization of semiconductor nanostructures with asymmetric metallic layers offers new paths to circular polarization control and chiral properties. The study on GaAs-based nanowires reveals optical spin-dependent specular reflection in the 680-1000 nm spectral range when the orientation of the golden layers follows the rule of extrinsic chirality. A novel, time-efficient numerical method is proposed to analyze the far-field intensity and distribution of scattered light from sparse NW ensembles, showing good agreement with theoretical predictions.
Hybridization of semiconductor nanostructures with asymmetric metallic layers offers new paths to circular polarization control and chiral properties. Here we study, both experimentally and numerically, chiral properties of GaAs-based nanowires (NWs) which have two out of six sidewalls covered by Au. Sparse ensembles of vertical, free-standing NWs were fabricated by means of lithography-free self-assembled technique on Si substrates and subsequently covered by Au using tilted evaporation. We report on optical spin-dependent specular reflection in the 680-1000 nm spectral range when the orientation of the golden layers follows the rule of extrinsic chirality. The analysis shows reflection peaks of the chiral medium whose intensity is dependent on the light handedness. We further propose a novel, time-efficient numerical method that enables a better insight into the far-field intensity and distribution of the scattered light from a sparse NW ensembles. The measurements done on three different samples in various orientations show good agreement with theoretical predictions over a broad wavelength range.
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