Premium
Semiconductor Bow‐Tie Nanoantenna from Coupled Colloidal Quantum Dot Molecules
Author(s) -
Cui Jiabin,
Koley Somnath,
Panfil Yossef E.,
Levi Adar,
Waiskopf Nir,
Remennik Sergei,
Oded Meirav,
Banin Uri
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202101155
Subject(s) - quantum dot , bow tie , materials science , semiconductor , molecule , chromophore , fluorescence , nanotechnology , optoelectronics , molecular physics , photochemistry , chemistry , optics , physics , telecommunications , organic chemistry , computer science , antenna (radio)
Top‐down fabricated nanoantenna architectures of both metallic and dielectric materials show 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. We synthesize the smallest bow‐tie 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 bow‐tie architecture manifests nanoantenna functionality of enhanced emission polarization along the bow‐tie axis, as predicted theoretically and revealed by single‐particle spectroscopy. Theory also predicts the formation of an electric‐field hotspot at the bow‐tie 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 bow‐tie dimer functionality as a photochemical reaction center.