Small· 2026Q1
Spectral Matching and Spatially Dependent Polarization‐Selective Attenuation in Chiral Au‐SiO 2 ‐Quantum Dot Nanohybrids
- 0citations
- Q1SCImago
- 2026year
Short summary
Chiral Au/SiO2/QD nanohybrids generate strong circularly polarized luminescence (CPL) with dissymmetry factors (g_lum) up to 0.12 (visible) and 0.014 (NIR) when QD emission spectrally matches the chiral Au response, acting as nanopolarizers via polarization-selective attenuation.
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Key points
- Au/SiO2/QD nanohybrids combine chiral plasmonic gold with achiral quantum dot emitters for solution-processable CPL materials.
- Spectrally matched nanohybrids achieve strong CPL (g_lum up to 0.12 visible, 0.014 NIR) by acting as nanopolarizers through polarization-selective attenuation.
- Spectrally mismatched nanohybrids show distance-dependent reversal of g_lum with silica spacer thickness, indicating spatially controlled differential attenuation.
- Optical simulations confirm position-dependent differential attenuation across chiral gold helicoids, explaining the heterogeneous CPL origin.
AI-generated from the title and abstract; the full text is not read.
Abstract
ABSTRACT Discrete colloidal nanohybrids that combine efficient achiral emitters with chiral plasmonic nanostructures offer a promising route to solution‐processable circularly polarized luminescence (CPL)‐active materials. Here, we construct Au/SiO 2 /QDs nanohybrids by assembling quantum dots (QDs) onto silica‐coated chiral Au helicoids, where the SiO 2 layer controls the separation between the QDs and the plasmonic core. When the QD emission is spectrally matched with the chiroptical response of the chiral Au/SiO 2 nanoparticles, the Au/SiO 2 ensemble acts as a nanopolarizer and produces strong CPL through polarization‐selective attenuation. The resulting nanohybrids exhibit luminescence dissymmetry factor ( g lum ) values reaching 0.12 in the visible region and 0.014 in the near‐infrared region. To clarify how nanoscale arrangement influences CPL, we further construct spectrally mismatched nanohybrids in which the ensemble‐level contribution is suppressed. In this regime, changing the SiO 2 spacer thickness leads to a distance‐dependent reversal of g lum , indicating that QD emission experiences spatially dependent differential attenuation near the chiral Au surface. Optical simulations further reveal position‐dependent differential attenuation across individual chiral Au helicoids, supporting the spatially heterogeneous origin of the CPL response in the mismatched system. These findings position chiral Au/SiO 2 /QDs nanohybrids as a useful colloidal platform for both strong CPL generation and spatially resolved control of polarization‐selective attenuation.
The authors' abstract, as published at the source. Small, 2026 · DOI ↗
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Field: Electronic, Optical and Magnetic Materials
Electronic, Optical and Magnetic MaterialsMaterials Science