Optimization of DMD-based independent amplitude and phase modulation by analysis of target complex wavefront

Georgieva, Alexandra; Белашов, А. В.; Petrov, Nikolay V.

doi:10.1038/s41598-022-11443-x

Cited by 8 publications

(4 citation statements)

References 60 publications

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“…As such, techniques employing SLMs commonly involve the implementation of all sorts of interferometric setups in combination with complex amplitude modulation (CAM), allowing to manipulate independently both the polarisation and spatial degrees of freedom of each constituent scalar light beam [23][24][25]. CAM can produce high-quality scalar beams by simultaneously shaping the phase and amplitude of a given light field using a computer-generated-hologram (CGH) that requires a grating to separate the desired modulated light, commonly lying in the first diffraction order, from the undesired ones [26][27][28][29]. In this case, the zeroth diffraction order is always the brightest, in contrast to phase-only modulation, where the first order can be the most bright.…”

Section: Introductionmentioning

confidence: 99%

On-axis complex-amplitude modulation for the generation of super-stable vector modes

Rodríguez-Fajardo,

Arvizu,

Daza-Salgado

et al. 2024

J. Opt.

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We propose a technique to generate complex vector beams with high quality and stability. Our approach relies on the combination of Complex Amplitude Modulation (CAM) and on-axis modulation, two techniques that seem incompatible at first glance. The first one produces scalar structured light fields in phase and amplitude with high accuracy, while the second one is preferred for generating vector beams of great stability although of reduced quality. Specifically, the idea behind our technique is to send the shaped light produced by CAM co-axially with the zeroth order, rather than diffracted to the first order, as it is commonly done. We first describe our technique, explaining the generation of the hologram and experimental setup to isolate the desired vector mode, and then present experimental results that corroborate our approach. We first address the quality of the generated beams using Stokes polarimetry to reconstruct their transverse polarisation distribution, and then compare their stability against the same mode produced using a Sagnac interferometric method. Our vector beams are of good quality and remarkably stable, two qualities that we expect will appeal to the community working with vector modes.

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Section: Introductionmentioning

confidence: 99%

On-axis complex-amplitude modulation for the generation of super-stable vector modes

Rodríguez-Fajardo,

Arvizu,

Daza-Salgado

et al. 2024

J. Opt.

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“…Optimizing the wavefront with a phase-only constraint is one of the most popular and successful methods in computer-generated holography, microscopy, and wavefront shaping in complex media using phase-only SLMs. While this approach has been successfully demonstrated on DMDs ( 7 , 8 , 43 ), it omits the possibility of simultaneous amplitude and phase modulation ( 54 , 55 ) and could be susceptible to ill-posedness and ill-conditionedness of the inverse problem without proper regularization ( 10 , 56 ), leading to suboptimal inverse solutions with limited projection fidelity.…”

Section: Introductionmentioning

confidence: 99%

High-fidelity and high-speed wavefront shaping by leveraging complex media

Yu,

You

2024

Sci. Adv.

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High-precision light manipulation is crucial for delivering information through complex media. However, existing spatial light modulation devices face a fundamental speed-fidelity tradeoff. Digital micromirror devices have emerged as a promising candidate for high-speed wavefront shaping but at the cost of compromised fidelity due to the limited control degrees of freedom. Here, we leverage the sparse-to-random transformation through complex media to overcome the dimensionality limitation of spatial light modulation devices. We demonstrate that pattern compression by sparsity-constrained wavefront optimization allows sparse and robust wavefront representations in complex media, improving the projection fidelity without sacrificing frame rate, hardware complexity, or optimization time. Our method is generalizable to different pattern types and complex media, supporting consistent performance with up to 89% and 126% improvements in projection accuracy and speckle suppression, respectively. The proposed optimization framework could enable high-fidelity high-speed wavefront shaping through different scattering media and platforms without changes to the existing holographic setups, facilitating a wide range of physics and real-world applications.

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“…1(a)). To enable high-precision wavefront shaping in high-speed applications, a wide variety of approaches, including Lee hologram method [51][52][53], superpixel method [54], and island algorithm [55], have been proposed to convert a binary DMD pattern into a complex wavefront, which is commonly used in transmission-matrix-based (TM) approaches [56].…”

Section: Introductionmentioning

confidence: 99%

High-Fidelity and High-Speed Wavefront Shaping through Complex Media via Sparsity-Constrained Optimization

Yu¹,

You²

2023

Preprint

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Achieving high-precision light manipulation is crucial for delivering information through complex media with high fidelity. However, existing spatial light modulation devices face a fundamental tradeoff between speed and accuracy, limiting their use in various real-time and qualitydemanding applications. To address this challenge, we propose a physics-based sparsity-constrained optimization framework for enhancing projection quality through complex media at a full DMD frame rate of 22 kHz. By addressing the limited degrees of freedom, scattering effect, and ill-posed and ill-conditioned nature of the inverse problem, our method achieves solutions with higher feasibility, optimality, and better numerical stability simultaneously. In addition, our method is system-agnositc and generalizable, showing consistent performance across different types of complex media. These results demonstrate the potential of our method in paving the way for high-fidelity and highspeed wavefront shaping in complex media, enabling a wide range of applications, such as non-invasive deep brain imaging, high-speed holographic optogenetics, and miniaturized fiber-based 3D printing devices.

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Optimization of DMD-based independent amplitude and phase modulation by analysis of target complex wavefront

Cited by 8 publications

References 60 publications

On-axis complex-amplitude modulation for the generation of super-stable vector modes

On-axis complex-amplitude modulation for the generation of super-stable vector modes

High-fidelity and high-speed wavefront shaping by leveraging complex media

High-Fidelity and High-Speed Wavefront Shaping through Complex Media via Sparsity-Constrained Optimization

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