Polarization-sensitive optoionic membranes from chiral plasmonic nanoparticles

Area of Science:

• Optoelectronics
• Materials Science
• Nanotechnology

Background:

• Direct photocurrent observation in chiral materials is challenging due to small optoelectronic effects.
• Chiral metasurfaces enhance circular polarization sensitivity but have manufacturing and performance limitations.

Purpose of the Study:

• To develop a highly sensitive method for detecting circular polarization using nanoporous thin films of chiral nanoparticles.
• To investigate light-induced polarization-dependent ion accumulation for enhanced photocurrent generation.

Main Methods:

• Fabrication of self-assembled multilayers of gold nanoparticles modified with L-phenylalanine.
• Utilizing plasmonic coupling and planar chiroplasmonic modes for electron ejection.
• Employing a phenylalanine layer to promote electron entrapment at the membrane-electrolyte interface.

Main Results:

• Achieved a photocurrent difference of 2.41 times between right-handed and left-handed circularly polarized light.
• Demonstrated high sensitivity to light ellipticity across all incident angles.
• Observed phenomena mimicking polarization vision in marine animals.

Conclusions:

• Nanoporous chiral nanoparticle films offer a simple and sensitive platform for circular polarization detection.
• The developed optoionic membranes pave the way for miniaturized chiral photonic devices.
• This approach enhances optoelectronic sensitivity to light polarization through ion accumulation mechanisms.