Extreme Optical Chirality from Plasmonic Nanocrystals on a Mirror

Yidong Hou; Xiu Yang; Shu Hu; Qianqi Lin; Jie Zhou; Jialong Peng; Chenyang Guo; Shanshan Huang; Liangke Ren; Ana Sánchez-Iglesias; Rohit Chikkaraddy; Jeremy J. Baumberg

doi:10.1021/acs.nanolett.4c05668

Extreme Optical Chirality from Plasmonic Nanocrystals on a Mirror

Yidong Hou^*, Xiu Yang, Shu Hu, Qianqi Lin, Jie Zhou, Jialong Peng, Chenyang Guo, Shanshan Huang, Liangke Ren, Ana Sánchez-Iglesias, Rohit Chikkaraddy^*, Jeremy J. Baumberg^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

Metal nanocrystals synthesized in achiral environments usually exhibit no chiroptical effects. However, by placing nominally achiral nanocrystals 1.3 nm above gold films, we find giant chiroptical effects, reaching anisotropy factors as high as g ≈ 0.9 for single nanodecahedra placed on a gold mirror (NDoM). We show that this is a general phenomenon depending on the geometry, demonstrating it for various nanocrystal shapes. Theoretical modeling reveals that tiny chiral imperfections are strongly enhanced by edge modes in the gap, which coherently superpose with in-plane dipoles to generate strong chiroptical signatures. This phenomenon results in photonic spin Hall effects and distinctive chiral scattering patterns.

Original language	English
Pages (from-to)	1158-1164
Number of pages	7
Journal	Nano letters
Volume	25
Issue number	3
Early online date	13 Jan 2025
DOIs	https://doi.org/10.1021/acs.nanolett.4c05668
Publication status	Published - 22 Jan 2025

Keywords

chiroptical effect
multiple dipole decomposition theory
nanodecahedra
nanoparticle on mirror
photonic spin Hall effect

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10.1021/acs.nanolett.4c05668Licence: CC BY

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title = "Extreme Optical Chirality from Plasmonic Nanocrystals on a Mirror",

abstract = "Metal nanocrystals synthesized in achiral environments usually exhibit no chiroptical effects. However, by placing nominally achiral nanocrystals 1.3 nm above gold films, we find giant chiroptical effects, reaching anisotropy factors as high as g ≈ 0.9 for single nanodecahedra placed on a gold mirror (NDoM). We show that this is a general phenomenon depending on the geometry, demonstrating it for various nanocrystal shapes. Theoretical modeling reveals that tiny chiral imperfections are strongly enhanced by edge modes in the gap, which coherently superpose with in-plane dipoles to generate strong chiroptical signatures. This phenomenon results in photonic spin Hall effects and distinctive chiral scattering patterns.",

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T1 - Extreme Optical Chirality from Plasmonic Nanocrystals on a Mirror

AU - Hou, Yidong

AU - Yang, Xiu

AU - Hu, Shu

AU - Lin, Qianqi

AU - Zhou, Jie

AU - Peng, Jialong

AU - Guo, Chenyang

AU - Huang, Shanshan

AU - Ren, Liangke

AU - Sánchez-Iglesias, Ana

AU - Chikkaraddy, Rohit

AU - Baumberg, Jeremy J.

PY - 2025/1/22

Y1 - 2025/1/22

N2 - Metal nanocrystals synthesized in achiral environments usually exhibit no chiroptical effects. However, by placing nominally achiral nanocrystals 1.3 nm above gold films, we find giant chiroptical effects, reaching anisotropy factors as high as g ≈ 0.9 for single nanodecahedra placed on a gold mirror (NDoM). We show that this is a general phenomenon depending on the geometry, demonstrating it for various nanocrystal shapes. Theoretical modeling reveals that tiny chiral imperfections are strongly enhanced by edge modes in the gap, which coherently superpose with in-plane dipoles to generate strong chiroptical signatures. This phenomenon results in photonic spin Hall effects and distinctive chiral scattering patterns.

AB - Metal nanocrystals synthesized in achiral environments usually exhibit no chiroptical effects. However, by placing nominally achiral nanocrystals 1.3 nm above gold films, we find giant chiroptical effects, reaching anisotropy factors as high as g ≈ 0.9 for single nanodecahedra placed on a gold mirror (NDoM). We show that this is a general phenomenon depending on the geometry, demonstrating it for various nanocrystal shapes. Theoretical modeling reveals that tiny chiral imperfections are strongly enhanced by edge modes in the gap, which coherently superpose with in-plane dipoles to generate strong chiroptical signatures. This phenomenon results in photonic spin Hall effects and distinctive chiral scattering patterns.

KW - chiroptical effect

KW - multiple dipole decomposition theory

KW - nanodecahedra

KW - nanoparticle on mirror

KW - photonic spin Hall effect

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SP - 1158

EP - 1164

JO - Nano letters

JF - Nano letters

IS - 3

ER -

Extreme Optical Chirality from Plasmonic Nanocrystals on a Mirror

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