Metasurface-empowered optical cryptography

Yang, Hui; Ou, Kai; Wan, Hengyi; Hu, Yueqiang; Wei, Zeyong; Jia, Honghui; Cheng, Xinbin; Liu, Na; Duan, Huigao

doi:10.1016/j.mattod.2023.06.003

Cited by 20 publications

(5 citation statements)

References 199 publications

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“…19,20 As a result, various metasurface-based optical encryption approaches are demonstrated to achieve highsecurity information storage based on distinct optical manipulation principles and encryption coding methods. 21 For instance, by utilizing multiple optical channels with different wave vectors, 22,23 orbital angular momentums, 24,25 polarizations, 26,27 or surroundings, 28,29 plaintext information can be encrypted into a single metasurface, making the information only visible under specific optical conditions. Furthermore, a combination of encoding techniques, such as Muller matrix modulation, 30 computer imaging algorithm, 31 diffraction algorithm, 32 and Caesar cipher, 22 augments the citadel of information security by avoiding direct observation of plaintext.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Consequently, information security has become a significant focus in order to safeguard data security, leading to numerous advances in cryptographic technology. − Within this realm, metasurface-based optical encryption presents an excellent framework for the secure storage of encrypted information. − Optical encryption offers several unique merits, , including high speed, parallel processing, low power consumption, and numerous encoding channels. In tandem, the metasurface provides a compact subwavelength photonic platform with powerful light manipulation ability that can concurrently encode multiple optical parameters, − such as amplitude, , phase, , polarization, , and wavelength. , As a result, various metasurface-based optical encryption approaches are demonstrated to achieve high-security information storage based on distinct optical manipulation principles and encryption coding methods . For instance, by utilizing multiple optical channels with different wave vectors, , orbital angular momentums, , polarizations, , or surroundings, , plaintext information can be encrypted into a single metasurface, making the information only visible under specific optical conditions.…”

Section: Introductionmentioning

confidence: 99%

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Compression-Encrypted Meta-Optics for Storage Efficiency and Security Enhancement

Wang,

Niu,

Zhao

et al. 2024

ACS Photonics

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Information security is of vital importance in daily life, stimulating various cryptographic strategies to protect data from leaking. Among them, metasurface-based optical encryption is an excellent candidate because of its unique features, including numerous encoding channels and incomparable light-field manipulation ability. However, for state-of-the-art metasurface encryption, it is still critical to further improve its storage efficiency with high security for practical information-storage applications. Here, combining data compression and optical encryption, compression-encrypted meta-optics (CEM) is proposed to improve the regular metasurface storage efficiency by an order of magnitude while maintaining high information security. Utilizing lossless compression algorithms, the plaintexts are re-encoded into nonintuitive ciphertexts and keys with much less data volume (∼1/10), thus providing the first security barrier and increasing storage efficiency. Moreover, the polarization-encrypted metasurfaces also protect the ciphertexts from direct observation, providing a second security barrier. Overall, such a CEM with two security barriers significantly improves the optical storage efficiency and presents a novel route for potential applications in next-generation optical information storage/encryption.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compression-Encrypted Meta-Optics for Storage Efficiency and Security Enhancement

Wang,

Niu,

Zhao

et al. 2024

ACS Photonics

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

“…Nowadays, optical information processing methods have garnered significant attention, particularly for secure management of sensitive data through optical encryption [1][2][3][4]. Optical cryptosystems offer multiple parameters to encode information, such as wavelength, polarization, amplitude, phase, among others [1][2][3][4]. Double random phase encoding (DRPE) has received the most extensive research [1-3, 5, 6], particularly in cryptosystems based on the 4f [6,7] or the joint transform correlator (JTC) [5,[8][9][10] architectures.…”

Section: Introductionmentioning

confidence: 99%

Application of the fractional Fourier transform for decryption in experimental optical cryptosystems

Vargas-Castrillon,

Velez-Zea,

Barrera-Ramírez

2024

J. Opt.

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In this contribution, we introduce a new practical approach to apply the fractional Fourier transform in the modelling of two optical systems: free space propagation and a single lens processor. This formulation presents a simple way to stablish a direct relationship between physical parameters of the two optical systems and a real-valued fractional order. Furthermore, we employ and compare two numerical methods for evaluating the fractional Fourier transform: the convolution and the Fresnel transform. Consequently, we apply this innovative approach to the digital decryption process in an opto-digital joint transform correlator cryptosystem, considering both the free space propagation and the single lens processor variants. We analyse both numerically and experimentally encrypted data to support our proposed method and to investigate the sensitivity of the decryption process with the fractional order. Notably, we obtain similar decryption results for both numerically and experimentally encrypted objects, demonstrating excellent agreement between the theoretical model, the numerical test, and the experiment.

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“…PIT has a wide range of applications in optical devices. For example, using PIT can design and implement efficient optical switches [18][19][20], optical sensors, and optical memories [21][22][23][24]. In addition, PIT can also be used for research and applications in fields such as optical absorption [25][26][27] and slow light effects [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Terahertz refractive index sensor based on dual plasmon-induced transparency in a graphene metasurface

Yang,

Xu,

et al. 2024

Phys. Scr.

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A novel graphene metasurface is proposed in this article, which is simulated by the finite difference time domain (FDTD) and found to exhibit a significant dual Plasmon-induced transparency (PIT) phenomenon in the terahertz frequency band. For further research, new transmission spectra are simulated using the coupled mode theory (CMT), and after comparison, it is found that the images were basically consistent and had a high degree of agreement. In addition, through observation and analysis of the PIT window, it is found that the PIT phenomenon can be effectively tuned by adjusting the Fermi level. Finally, the metasurface is proposed in this article, which has excellent sensing properties. After calculation and comparison of different refractive indices of surrounding media, it is found that the maximum sensitivity can reach 1.567 THz/RIU at a frequency of f = 4.8716 THz, with a figure of merit (FOM) of 23.855. Compared with other sensors of the same type, the sensor in this paper has great advantages. In summary, the graphene metasurface proposed in this article provides more theoretical support for manufacturing dynamically adjustable graphene sensors.

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Metasurface-empowered optical cryptography

Cited by 20 publications

References 199 publications

Compression-Encrypted Meta-Optics for Storage Efficiency and Security Enhancement

Compression-Encrypted Meta-Optics for Storage Efficiency and Security Enhancement

Application of the fractional Fourier transform for decryption in experimental optical cryptosystems

Terahertz refractive index sensor based on dual plasmon-induced transparency in a graphene metasurface

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