Enhanced Plasmonic Photocatalysis through Cooperative Plasmonic--Photonic Hybridization

TL;DR

This paper introduces a hybrid plasmonic-photonic resonance approach that significantly boosts hot electron generation in plasmonic photocatalysts, enabling more efficient light-driven chemical reactions through engineered light harvesting.

Contribution

The study demonstrates a novel hybridization strategy coupling plasmonic nanoparticles with photonic crystal resonances to enhance hot electron production at tunable wavelengths, improving photocatalytic efficiency.

Findings

Enhanced reaction rates with hybrid resonance coupling

Broad material and shape compatibility for NPs

Potential for rational design of high-performance photocatalysts

Abstract

Plasmonic nanoparticles (NPs) hold tremendous promise for catalyzing light-driven chemical reactions. The conventionally assumed detrimental absorption loss from plasmon damping can now be harvested to drive chemical transformations of the NP adsorbent, through the excitation and transfer of energetic "hot" carriers. The rate and selectivity of plasmonic photocatalysis are dependent on the characteristics of the incident light. By engineering the strength and wavelength of the light harvesting of a NP, it is possible to achieve more efficient and predictive photocatalysts. We report a plasmonic--photonic resonance hybridization strategy to substantially enhance hot electron generation at tunable, narrow-band wavelengths. By coupling the plasmon resonance of silver NPs to the guided mode resonance in a photonic crystal (PC) slab, the reaction rate of a hot-electron-driven reduction conversion is greatly accelerated. The mechanism is broadly compatible with NPs with manifold materials and shapes optimized for the targeted chemistry. The novel enhancement platform sheds light on rational design of high-performance plasmonic photocatalysts.