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EACON 2020

EurAsian Conference on Nanophotonics

Virtual Meeting / October 5 – 7, 2020

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Plasmonic Doppler gratings for Hydrogen sensing and coking detection

Yi-Ju Chen | Leibniz Institute of Photonic Technology | Jena, Germany

Abstract

Nanoparticle-based plasmonic sensors require broadband illumination and a spectrometer to analyze the spectral shift of the relatively broad localized surface plasmon resonance, rendering the detection of tiny spectral shift difficult. Here, we extend our previous design of plasmonic Doppler gratings (PDGs) [1,2] to develop metal-insulator-metal PDG (MIM-PDG) for hydrogen sensing (Fig.1(a)) and dielectric-loaded PDG (DL-PDG) for monitoring the carbon deposition (called “coking”) on the metallic surface of heterogeneous catalyst (Fig.1(b)). The PDG structure mimics the wave fronts of a moving point source to provide azimuthal angle-dependent chirped periodicity. Therefore, change in local environment is reported by the change in the azimuthal intensity profile. This allows for spectrometer–free plasmonic optical sensing. The MIM-PDG (Pd-Al2O3-Au) shows Fano-like transmission intensity profile, which is significantly broadened upon absorption of hydrogen gas from 0% to 4% (right panel, Fig.1(a)). The design of DL-PDGs (PMMA-C-Au) allows simple and cost-efficient realization of PDG coking sensors. The azimuthal reflection intensity profile changes with the thickness of carbon coking layer from 0 to 25 nm (right panel, Fig.1(b)).This provides an effective yet simple solution for on-site spectrometer-free optical monitoring of the coking effect on the heterogeneous catalyst.

 Figure 1 (a) Schematic (left) and the SEM image (middle) of a MIM-PDG, which exhibits Fano resonance features in the transmission intensity profile sensitive to the absorption of hydrogen (right). (b) Schematic (left) of a DL-PDG made of PDMS on top of gold film. The azimuthal reflection intensity profile changes with respect to the thickness of the carbon layer generated on the gold surface (right). 

[1] See, K. M. et al, Nanoscale 9 (2017), 10811-10819
[2] Lin, F. C. et al, Analytical Chemistry 91 (2019), 9382-9387

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