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Issue 16, 2019
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Superresolution stimulated Raman scattering microscopy using 2-ENZ nano-composites

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Abstract

Superlensing plays a crucial role in near- and far-field optical imaging with sub-wavelength resolution. One of the ways to expand optical bandwidth is surface plasmon resonances in layered metal-dielectric nanostructures. These resonances are commonly excited at a tunable single frequency. In this study, we propose the concept of a multimode far-field superlens made of a titanium oxynitride (TiON) thin film, that is a disordered metal-dielectric refractory nano-composite. These films exhibit a double epsilon-near-zero (2-ENZ) behavior near the percolation threshold and, therefore, favor super-coupling the incident laser light to surface plasmon resonances, not using such couplers as a prism, a grating, etc. We experimentally observe stimulated Raman gain emission from nano-structured TiON thin films exposed to low-power continuous-wave laser light. It is shown that superresolution of <λ/80 (near-field) and <λ/8 (far-field) is achieved due to both the enhanced third-order optical nonlinearity and the multiplicative nature of four-wave mixing. The multimode tunable far-field superlens will impact emerging diffraction-free far-field optical microscopy, random Raman lasing on meta-atoms and broadband thermophotovoltaics.

Graphical abstract: Superresolution stimulated Raman scattering microscopy using 2-ENZ nano-composites

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Article information


Submitted
06 Dec 2018
Accepted
21 Mar 2019
First published
22 Mar 2019

Nanoscale, 2019,11, 7710-7719
Article type
Paper

Superresolution stimulated Raman scattering microscopy using 2-ENZ nano-composites

S. S. Kharintsev, A. V. Kharitonov, A. M. Alekseev and S. G. Kazarian, Nanoscale, 2019, 11, 7710
DOI: 10.1039/C8NR09890E

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