Abstract
In this work, we study the strong confinement effects on the electromagnetic response of metallic nanoparticles. We calculate the field enhancement factor for nanospheres of various radii by using optical constants obtained from both classical and quantum approaches, and compare their size dependent features. To evaluate the scattered near field, we solve the electromagnetic wave equation within a finite element framework. When quantization of electronic states is considered for the input optical functions, a significant blue-shift in the resonance of the enhanced field is observed, in contrast to the case in which functions obtained classically are used. Furthermore, a noticeable underestimation of the field amplification is found in the calculation based on a classical dielectric function. Our results are in good agreement with available experimental reports and provide relevant information on the cross-over between classical and quantum regime, useful in potentiating nanoplasmonics applications.
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The authors acknowledge the Department of Physics of the Universidad de Los Andes, and the UPTC’s Research Division for financial support.
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Zapata-Herrera, M., Flórez, J., Camacho, A.S. et al. Quantum Confinement Effects on the Near Field Enhancement in Metallic Nanoparticles. Plasmonics 13, 1–7 (2018). https://doi.org/10.1007/s11468-016-0476-y
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DOI: https://doi.org/10.1007/s11468-016-0476-y