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Semiconductor Bow‐Tie Nanoantenna from Coupled Colloidal Quantum Dot Molecules by Jiabin Cui; Somnath Koley; Yossef E. Panfil; Adar Levi; Nir Waiskopf; Sergei Remennik; Meirav Oded; Uri Banin is a scholarly article available to read on EtoBox.

What is Semiconductor Bow‐Tie Nanoantenna from Coupled Colloidal Quantum Dot Molecules about?

Top-down fabricated nanoantenna architectures of both metallic and dielectric materials demonstrated powerful functionalities for Raman and fluorescence enhancement with relevance to single molecule sensing, while inducing directionality of chromophore emission with implications for single photon sources. Herein, we synthesize the smallest bowtie nanoantenna by selective tip-to-tip fusion of two tetrahedral colloidal quantum dots (CQDs) forming a dimer. While the tetrahedral monomers emit non-polarized light, the bowtie architecture manifests nanoantenna functionality of enhanced emission polarization along the bowtie axis as predicted theoretically and revealed by single particle spectroscopy. Theory also predicts the formation of an electric-field hotspot at the bowtie epicenter. This is utilized for selective light induced photocatalytic metal growth at that location, unlike growth on the free tips in dark conditions thus demonstrating the bowtie dimer functionality as a photochemical reaction center. Our findings pave a path for additional bottom-up bowtie architectures applicable in optics, sensing and photocatalysis.

Author

Jiabin Cui; Somnath Koley; Yossef E. Panfil; Adar Levi; Nir Waiskopf; Sergei Remennik; Meirav Oded; Uri Banin

Publisher

Wiley

Published

2021

Language

EN