Mapping the Refractive Index of Dielectric Surfaces with Spherical Plasmonic Nanoantenna

Abstract:

Here we demonstrate successful mapping the variations of the refractive index of a smooth dielectric surface by detecting spectral response of a single spherical-shape Ag nanoparticle optically aligned with a supporting optical fiber axicon microlens. We propose and examine various excitation schemes of the plasmonic nanoantenna to provide efficient interaction of its dipolar and quadrupolar modes with the underlying sample surface and to optimize the mapping resolution and sensitivity. Supporting finite-difference time-domain calculations are undertaken to tailor the interaction of the plasmonic nanoantenna and the underlying dielectric substrate upon various excitation conditions demonstrating good agreement with our experimental findings and explaining the obtained results.

• Periodical: Defect and Diffusion Forum (Volume 386)
• Pages: 214-218
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.386.214
• Online since: September 2018
• Authors: Stanislav O. Gurbatov*, Oleg B. Vitrik, Aleksandr A. Kuchmizhak
• Keywords: Fiber Microaxicon Lens, Localized Plasmon Resonance, Optical Fiber Probe, Plasmonic Nanoantenna, Refractive Index Mapping

References

[1] Novotny, L. & Hecht, B. Principles of Nano-Optics, Cambridge University Press, Cambridge, (2006).

[2] Albella, P., Moreno, F., Saiz, J. & Gonz´alez, F. Surface inspection by monitoring spectral shifts of localized plasmon resonances, Opt. Express 16, 12872–12879 (2008).

DOI: 10.1364/oe.16.012872

[3] Huth, F. et al. Resonant antenna probes for tip-enhanced infrared near-field microscopy, Nano Lett. 13, 1065–1072 (2013).

DOI: 10.1021/nl304289g

[4] Neumann, L., van 't Oever, J. & van Hulst, N. A resonant scanning dipole-antenna probe for enhanced nanoscale imaging, Nano Lett. 13, 5070–5074 (2013).

DOI: 10.1021/nl402178b

[5] Hillenbrand, R., Taubner, T. & Keilmann, F. Phonon-enhanced light-matter interaction at the nanometer scale, Nat. 418, 159–162 (2002).

DOI: 10.1038/nature00899

[6] Michaelis, J., Hettich, C., Mlynek, J. & Sandoghdar, V. Nanoscale fluorescence lifetime imaging of an optical antenna with a single diamond nv center, Nat. 405, 325–328 (2000).

DOI: 10.1038/35012545

[7] Beams, R. et al. Nanoscale fluorescence lifetime imaging of an optical antenna with a single diamond nv center, Nano Lett. 13, 3807–3811 (2013).

DOI: 10.1021/nl401791v

[8] Anger, P., Bharadwaj, P. & Novotny, L. Enhancement and quenching of single-molecule fluorescence, Phys. Rev. Lett. 96, 113002 (2006).

DOI: 10.1103/physrevlett.96.113002

[9] Taubner, T., Keilmann, F. & Hillenbrand, R. Nanoscale-resolved subsurface imaging by scattering-type near-field optical microscopy, Opt. Express 13, 8893–8899 (2005).

DOI: 10.1364/opex.13.008893

[10] Lee, T., Lee, E., Oh, S. & Hahn, J. W. Imaging heterogeneous nanostructures with a plasmonic resonant ridge aperture, Nanotechnol. 24, 145502 (2013).

DOI: 10.1088/0957-4484/24/14/145502

[11] Kuchmizhak, A., Gurbatov, S., Nepomniaschii, A., Vitrik, O. & Kulchin, Y. High-quality fiber microaxicons fabricated by a modified chemical etching method for laser focusing and generation of bessel-like beams, Appl. Opt. 53, 937–943 (2014).

DOI: 10.1364/ao.53.000937

[12] Gurbatov, S., Vitrik, O., Kulchin, Y. & Kuchmizhak, A. Mapping the refractive index with single plasmonic nanoantenna, Sci. Reports 8, 3861 (2018).

DOI: 10.1038/s41598-018-21395-w