A Quasi-Bound States in the Continuum Dielectric Metasurface-Based Antenna-Reactor Photocatalyst

Area of Science:

• Optics and Photonics
• Materials Science
• Chemical Engineering

Background:

• Metasurfaces are 2D artificial resonators enabling enhanced light-matter interactions.
• Quasi-Bound States in the Continuum (quasi-BIC) metasurfaces concentrate light efficiently.
• Photocatalysis utilizes light to drive chemical reactions, with potential for enhanced efficiency.

Purpose of the Study:

• To design and fabricate a quasi-BIC dielectric metasurface as an optical antenna for photocatalysis.
• To integrate nickel (Ni) nanoparticle reactors onto the metasurface to create an antenna-reactor photocatalyst.
• To investigate the light-harvesting and catalytic capabilities of this novel system.

Main Methods:

• Design and fabrication of a quasi-BIC dielectric metasurface.
• Deposition of Ni nanoparticle reactors onto the metasurface.
• Testing of H2 dissociation driven by the antenna-reactor photocatalyst under resonant illumination.
• Analysis of polarization, wavelength, and optical power dependencies.
• Investigation of E-field-induced electronic and photothermal effects.

Main Results:

• The quasi-BIC-Ni antenna-reactor successfully drove H2 dissociation.
• The catalytic activity showed strong dependencies on light polarization, wavelength, and optical power.
• Both electronic and photothermal mechanisms were identified as drivers for the reaction.
• Load-dependent reactivity studies and theoretical modeling supported the findings.

Conclusions:

• Dielectric metasurfaces can be effectively utilized as optical antennas in an antenna-reactor format for photocatalysis.
• The quasi-BIC metasurface concentrates light, enhancing the efficiency of light-driven chemical reactions.
• This approach offers new avenues for designing advanced photocatalysts with tailored light-harvesting properties.