Exploring Plasmonic-photonic Coupled Systems Using Microcavity-based Single-particle Spectroscopy
Author | : FENG PAN |
Publisher | : |
Total Pages | : 0 |
Release | : 2022 |
Genre | : |
ISBN | : |
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Control of light-matter interactions is important for a variety of applications, such as sensing, photocatalysis, and information science, to name a few. Recently, plasmonic-photonic coupled systems, which inherit ultrahigh-quality factor and ultrasmall mode volume from their component cavities, have shown promise in tailoring light-matter interactions. Understanding energy dynamics in such coupled systems which dictate multiple dissipation pathways and couplings, sheds light upon the rational design of optimal coupled systems, for instance, achieving disparity between couplings and dissipations for strong coupling and precisely controlling photon transfer rates between component cavities in photonic circuits. The core of my thesis examines a model system, i.e., a whispering-gallery-mode (WGM) microcavity coupled to a gold nanorod that supports localized surface plasmon (LSP), and addresses two main questions, i.e., how to elucidate system parameters and how to control them. I will present a new way that combines simultaneous measurement of absorption and transmission with theoretical modeling, to pin down eight system parameters spanning up to 9 orders of magnitude. I then demonstrate a solvent-embedding strategy to actively control plasmonic-photonic interactions in a microbubble cavity. Chloroform that has similar refractive index to the material of the microbubble cavity, is chosen to fill the microbubble for increasing the mode overlap between LSP and WGMs. The effect of modulating interior dielectric environment on mode volume and mode overlap is thoroughly interrogated through both experiments and optical simulations. In addition, I will demonstrate two most recent applications under the theme of plasmonics and photonics, i.e., single-particle photothermal imaging through high-Q all-glass WGM microcavities and plasmonic enhancement for electrocatalysis, respectively.