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

Active light-emitting all-dielectric nanoantennas recently have demonstrated great potential as 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...

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Bibliographic Details
Published in:Nanoscale 2019-06, Vol.11 (24), p.11634-11641
Main Authors: Mitsai, E, Naffouti, M, David, T, Abbarchi, M, Hassayoun, L, Storozhenko, D, Mironenko, A, Bratskaya, S, Juodkazis, S, Makarov, S, Kuchmizhak, A
Format: Article
Language:English
Subjects:
Composition
Conversion
Detection
Light emission
Light sources
Nanoantennas
Optimization
Position sensing
Refractivity
Silicon germanides
Spatial resolution
Thermodynamic properties
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Summary:Active light-emitting all-dielectric nanoantennas recently have demonstrated great potential as 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 nanoantenna emission and thermal properties in the process of their fabrication are highly desirable for various applications. Here, we propose a cost-effective approach to large-scale fabrication of Si1−xGex alloyed Mie nanoresonators possessing an enhanced inherent Raman response which can be simply tailored via tuning the Ge concentration. Moreover, by tailoring the relative Ge composition one can gradually change a complex refractive index of the produced Si1−xGex alloy, which affects the ratio between radiative and nonradiative losses in Si1−xGex nanoantennas, which is crucial for optimization of their optical heating efficiency. Composition-tunable Si1−xGex nanoantennas with an 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 advanced multichannel optical sensing, providing information on analyte's composition, analyte-nanoantenna temperature response and spatial position.
ISSN:2040-3364
2040-3372
DOI:10.1039/c9nr01837a