Optimized polarization-selective computer-generated hologram with fewer phase combinations

Area of Science:

• Optics and Photonics
• Holography
• Digital Optics

Background:

• Conventional computer-generated holograms (CGHs) require specific pixel structures for phase value combinations.
• Integrating two binary CGHs into a single polarization-selective CGH (PSCGH) typically results in four distinct phase combinations.
• Realizing these four combinations necessitates four unique pixel structures within the PSCGH.

Purpose of the Study:

• To propose and investigate an optimization method for reducing the number of phase combinations in PSCGHs.
• To simplify the fabrication process of PSCGHs by minimizing pixel structure types.
• To evaluate the performance of the optimized PSCGH in terms of diffraction efficiency and contrast ratio.

Main Methods:

• An optimization approach was employed to reduce the four phase combinations to three.
• The method focuses on minimizing the required pixel structures for PSCGH fabrication.
• The performance was analyzed based on first-order diffraction efficiency and contrast ratio.

Main Results:

• The proposed optimization method successfully reduced the four phase combinations to three.
• The optimized PSCGH achieved a first-order diffraction efficiency of 30%.
• A contrast ratio of 28 was obtained for the optimized PSCGH.

Conclusions:

• The optimization approach offers a viable method for simplifying PSCGH design and fabrication.
• Reduced phase combinations lead to a practical and potentially more efficient holographic element.
• The achieved diffraction efficiency and contrast ratio demonstrate the effectiveness of the proposed method.