Asian Journal of Physics Vol. 33, Nos 5 & 6 (2024) 387-398

Multiple image encoding using azimuthally polarized light beam and its effectiveness in free-space propagation through atmospheric turbulence

Allarakha Shikder1, Naveen K Nishchal1 and Kehar Singh2
1Department of Physics, Indian Institute of Technology Patna, Bihta, Patna-801 106, Bihar, India
2Optics and Photonics Center, Indian Institute of Technology Delhi, New Delhi- 110 016

Optical information processing has been gaining steadily increasing importance over the last several years, due to its ability to reduce energy consumption and parallel processing of information. However, atmospheric turbulence is a major drawback associated with this technology’s application in the context of free-space propagation. Turbulence in the atmosphere is caused by uneven heating of the layers/regions in air, resulting in temperature variations. Therefore, refractive index variations which cause light waves to become distorted, ultimately cause errors in the data. Of late, information encoding based on structured light has attracted considerable attention because of its distinct attributes of intensity, self-healing nature, phase, and polarization distribution. These characteristics offer greater flexibility in encoding information. Several techniques have been reported in the literature regarding information encoding in turbulent medium, using an array of vortices exploiting the property of phase singularity. Here, we demonstrate a multiple-image encoding technique based on an array of azimuthally polarized light beams. This method shows significant robustness in turbulent medium for short propagation distances. It is a single-shot intensity recording-based non-interferometric technique that offers flexibility for practical applications. Further, we use Arnold transform to safeguard the information. © Anita Publications. All rights reserved.
Doi: 10.54955/AJP.33.5-6.2024.387-398
Keywords: Atmospheric turbulence, Optical cryptography, Array of azimuthally polarized beams, Spatial light modulator.

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Method: Single- anonymous; Screened for Plagiarism? Yes
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