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Title: Polarization-resolved plasmon-modulated emissions of quantum dots coupled to aluminum dimers with sub-20 nm gaps
Authors: Zhang, Dao Hua
Fong, Kah Ee
Gao, Yuan
Dang, Cuong
Tobing, Landobasa Yosef Mario
Muhammad Danang Birowosuto
Demir, Hilmi Volkan
Keywords: DRNTU::Engineering::Electrical and electronic engineering
Plasmonic Enhancement
Aluminum Plasmonics
Issue Date: 2018
Source: Tobing, L. Y. M., Zhang, D. H., Fong, K. E., Muhammad Danang Birowosuto, Gao, Y., Dang, C., & Demir, H. V. (2018). Polarization-resolved plasmon-modulated emissions of quantum dots coupled to aluminum dimers with sub-20 nm gaps. ACS Photonics, 5(4), 1566-1574. doi:10.1021/acsphotonics.8b00009
Series/Report no.: ACS Photonics
Abstract: An aluminum dimer nanoantenna with nanogaps is an ideal platform for enhancing light–matter interaction at the nanoscale for the UV–vis spectrum, but its realization has been hindered by the surface oxidation of aluminum nanostructures, aluminum interband loss, and practical limitations in lithographic patterning. Here, we have overcome these problems and demonstrated the successful fabrication of an aluminum dimer antenna with a ∼10 nm gap, which to the best of our knowledge marks the smallest features of an Al nanoantenna. We present the first in-depth study of strongly polarization-dependent emissions of colloidal quantum dots coupled with Al dimers and elucidate the individual contributions of the excitation intensity, quantum yield, and extraction efficiency enhancements from numerical and experimental perspectives. We estimate the Purcell effect corresponding to a single Al-dimer antenna as ∼104 by taking into account the ensemble averaging effect and the distributions in emitter dipole orientations. This finding brings us a step closer toward a cost-effective realization of bright and ultrafast single emitters.
DOI: 10.1021/acsphotonics.8b00009
Rights: © 2018 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Photonics, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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