Controlling the spin-selective absorption with two-dimensional chiral plasmonic gratings.

Area of Science:

• Plasmonics
• Nanophotonics
• Chirality

Background:

• Chiral plasmonic nanostructures enable manipulation of light polarization.
• Controlling light-matter interactions at the nanoscale is crucial for advanced optical devices.

Purpose of the Study:

• To investigate spin-selective absorption in two-dimensional (2D) chiral plasmonic gratings.
• To demonstrate tunable control over light absorption and reflection based on circular polarization.
• To explore potential applications in photon-spin selective devices.

Main Methods:

• Excitation of chiral-dependent plasmonic cavity resonance.
• Fabrication and characterization of 2D chiral plasmonic gratings.
• Analysis of light absorption and reflection spectra for different circular polarizations.

Main Results:

• Achieved nearly 100% spin-selective absorption for right-handed circularly polarized light.
• Demonstrated flexible control over absorption location by tuning grating dimensions.
• Showcased enhancement and suppression of absorption intensity via Fabry-Perot interference.

Conclusions:

• 2D chiral plasmonic gratings exhibit efficient spin-selective absorption.
• Tunable optical properties enable precise control over light polarization.
• Potential applications include circularly polarized light detectors, chiral sensors, and spin lasers.