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Si1−xGex nanoantennas with tailored Raman response and light-to-heat conversion for advanced sensing applications.

Abstract

Active light-emitting all-dielectric nanoantennas recently have demonstrated a great potential to be highly efficient nanoscale light sources owing to their strong luminescent and Raman responses. However, their large-scale fabrication faces a number of problems related to productivity limits of existing lithography techniques. Thus, high-throughput fabrication strategies allowing in a facile way to tailor of the nanoantennas emission and thermal properties in the process of their fabrication are highly desirable for various application. Here, we propose a cost-effective approach to large-scale fabrication of Si1−xGex alloyed Mie nanoresonators possessing enhanced inherent Raman response which can be simply tailored via tuning Ge concentration. Moreover, by tailoring relative Ge composition one can gradually change a complex refractive index of the produced Si$_{1-x}$Ge$_{x}$ alloy, which affects the ratio between radiative and nonradiative losses in Si1−xGex nanoantennas, being crucial for optimization of their optical heating efficiency. Composition-tunable Si1−xGex nanoantennas with optimized size, light-to-heat conversion and Raman response are implemented for non-invasive sensing of 4-aminothiophenol molecules with a temperature feedback modality and high subwavelength spatial resolution. The results are important for an advanced multichannel optical sensing, providing an information on analyte's composition, analyte-nanoantenna temperature response and spatial position.

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Supplementary files

Publication details

The article was received on 01 Mar 2019, accepted on 26 Mar 2019 and first published on 01 Apr 2019


Article type: Paper
DOI: 10.1039/C9NR01837A
Nanoscale, 2019, Accepted Manuscript

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    Si1−xGex nanoantennas with tailored Raman response and light-to-heat conversion for advanced sensing applications.

    E. Mitsai, M. Aouassa, L. Hassayoun, D. Stozhenko, A. Mironenko, S. Bratskaya, S. Juodkazis, S. Makarov and A. Kuchmizhak, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C9NR01837A

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