Publication date: 15th July 2022
Evanescent fields find applications in a plethora of areas due to their positive features such as near-surface interactions free from the diffraction limit, plasmon resonance excitation, low laser power requirements and on- chip integration. These exponentially decaying fields can be generated at interfaces in various arrangements such as a prism configuration and optical fibres which have been tapered to sub-micron waists. They are widely used for the manipulation and transport of particles sized from the micro to the atomic scale, as well as to improve signal-to-noise ratio in fluorescence microscopy.
In this work, we present an experimental setup capable of combining evanescent field optical binding and fluorescence excitation of colloidal quantum dot (QD) microspheres. The optical binding force allows for the synchronised control of multiple particles with high precision creating ordered structures such as particle chains and arrays, while total internal reflection excitation provides high signal to noise ratio. Evanescent fields here are generated on a glass-water interface by two different laser sources: one for particle manipulation and another for photoluminescence excitation. The experimental data reveal enhancement in the PL intensity of the QD microspheres when optically bound due to radiative energy transfer mediated via the formation of whispering gallery modes. The successful confinement and creation of dynamically configurable ordered structures of nanoparticles, such as QDs which are commercially being used, can be of great importance to the scientific community and could possibly lead to novel applications.
This work is financially supported by the European Regional Development Fund and the Republic of Cyprus through the Research and Innovation Foundation (Grant Agreement No. "OPPORTUNITY/0916/MSCA/0024", Acronym "FastBind"). NL acknowledges The Leverhulme Trust for the Research Leadership Award RL-2019-038 "Lasers and photonics of the future: self-assembled optically active resonators".
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