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Hybridized Guided-Mode Resonances via Colloidal Plasmonic Self-Assembled Grating
Authors
Vaibhav Gupta
Joby Joseph
+5 more
Tobias A.F. König
Mohit Kumar
Patrick T. Probst
Swagato Sarkar
Jonas Schubert
Publication date
1 January 2019
Publisher
Washington, DC : Soc.
Doi
Cite
Abstract
For many photonic applications, it is important to confine light of a specific wavelength at a certain volume of interest at low losses. So far, it is only possible to use the polarized light perpendicular to the solid grid lines to excite waveguide-plasmon polaritons in a waveguide-supported hybrid structure. In our work, we use a plasmonic grating fabricated by colloidal self-assembly and an ultrathin injection layer to guide the resonant modes selectively. We use gold nanoparticles self-assembled in a linear template on a titanium dioxide (TiO 2 ) layer to study the dispersion relation with conventional ultraviolet-visible-near-infrared spectroscopic methods. Supported with finite-difference in time-domain simulations, we identify the optical band gaps as hybridized modes: plasmonic and photonic resonances. Compared to metallic grids, the observation range of hybridized guided modes can now be extended to modes along the nanoparticle chain lines. With future applications in energy conversion and optical filters employing these cost-efficient and upscalable directed self-assembly methods, we discuss also the application in refractive index sensing of the particle-based hybridized guided modes. Copyright © 2019 American Chemical Society
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Last time updated on 30/05/2019
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Repositorium für Naturwissenschaften und Technik
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Last time updated on 30/05/2019