Design of thin infrared quarter-wave and half-wave plates using antenna-array sheets

Area of Science:

• Electromagnetics and Optics
• Metamaterials and Metasurfaces

Background:

• Wave plates are crucial optical components for polarization manipulation.
• Traditional wave plates can be bulky and challenging to integrate into compact systems.

Purpose of the Study:

• To design and model thin quarter-wave and half-wave plates using antenna-array sheets (AAS).
• To achieve precise control over the phase difference between orthogonal polarizations.

Main Methods:

• Development of an equivalent transmission-line model for cascaded antenna-array sheets.
• Modeling interspacing dielectric as a transmission line and AAS as loaded shunt admittances.
• Utilizing the model to design differential phase shifters for orthogonal polarizations.

Main Results:

• A quarter-wave plate was designed using two AAS, and a half-wave plate using three AAS.
• Both designs demonstrated high transmission efficiency.
• The desired 90° and 180° phase differences were achieved between orthogonal polarizations.

Conclusions:

• The proposed antenna-array sheet designs offer a compact and effective solution for creating wave plates.
• The transmission-line model provides an accurate method for analyzing and designing such devices.
• These novel wave plates have potential applications in optical systems requiring precise polarization control.