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Updated: Feb 13, 2026

Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation
Published on: October 4, 2024
Phase-controlled, speckle-free holographic projection with applications in precision optogenetics
Tal Aharoni1,2, Shy Shoham1,3
1Technion-Israel Institute of Technology, Faculty of Biomedical Engineering, Technion City, Haifa, Israel.
We developed a new algorithm to eliminate holographic speckle in computer-generated holography (CGH) projections. This method enables speckle-free, amplitude-controlled patterns for improved holographic applications.
Area of Science:
- Optics and Photonics
- Digital Holography
- Image Processing
Background:
- Holographic speckle significantly degrades the quality of computer-generated holographic (CGH) projections.
- This limitation impacts various applications, including displays, optical tweezers, machining, and optogenetic neural control.
Purpose of the Study:
- To introduce an iterative phase retrieval algorithm for projecting amplitude-controlled, speckle-free holographic patterns.
- To demonstrate simultaneous control over both phase and amplitude with high diffraction efficiency.
Main Methods:
- Development of the weighted Gerchberg-Saxton with phase-control (GSW-PC) algorithm.
- Integration of GSW-PC with the angular spectrum method for volumetric pattern projection.
- Numerical and experimental validation of the algorithm's performance.
Main Results:
- Achieved projection of amplitude-controlled, speckle-free one-dimensional patterns with high uniformity.
- Demonstrated simultaneous phase and amplitude control with high diffraction efficiencies.
- Successfully addressed challenges in projecting volumetric phase and amplitude-controlled patterns.
Conclusions:
- The GSW-PC algorithm effectively overcomes holographic speckle in CGH.
- The developed framework enables high-quality, controlled holographic pattern projection for diverse applications.
- The method shows superior performance compared to conventional and modern CGH techniques.
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