Polarization Inversion with Parity-Time-Reversal-Duality Symmetric Scatterers

Area of Science:

• Optics and Photonics
• Condensed Matter Physics
• Electromagnetism

Background:

• Parity-time-reversal-duality (P·T·D) symmetry is a key concept in non-Hermitian physics.
• Understanding light-matter interactions with symmetric scatterers is crucial for optical device development.

Purpose of the Study:

• To theoretically and experimentally investigate the backscattering properties of arbitrary scatterers preserving P·T·D symmetry.
• To explore the polarization transformation of incident light upon reflection from these P·T·D symmetric structures.
• To identify potential applications of these unique reflection characteristics.

Main Methods:

• Theoretical analysis of wave propagation and reflection from P·T·D symmetric scatterers.
• Experimental validation using fabricated scatterer structures.
• Polarization analysis of incident and backscattered electromagnetic waves.

Main Results:

• Demonstrated that P·T·D symmetric scatterers produce a mirror-symmetric backscattered electric field.
• Showcased that elliptically polarized waves transform via a parity transformation upon reflection.
• Observed that circularly polarized waves reflect with opposite spin angular momentum.

Conclusions:

• P·T·D symmetric scatterers exhibit unique polarization-dependent reflection properties.
• The observed spin reversal of circularly polarized light offers a novel mechanism for optical control.
• These findings pave the way for applications in reflective polarizers and spin-selective optical devices.