We propose a double image encryption by using random binary encoding and gyrator transform. Two secret images are first regarded as the real part imaginary of complex function. Chaotic map is used for obtaining matrix. The function exchanged under control data. An iterative structure composed method designed employed enhancing security algorithm. parameters in chaotic transform serve keys this scheme. Some numerical simulations have been made, to demonstrate performance

Polarization is a basic characteristic of electromagnetic waves that conveys much optical information owing to its many states. The polarization state manipulated and controlled for security, encryption, communication. Metasurface devices provide new way manipulate wave-fronts light. A single ultrathin metasurface device can generate modulate several differently polarized light fields, thus carries in different channels. Terahertz (THz) have become widely used as carrier wireless Compact...

We present a novel image-encryption algorithm that employs multichannel and multistage fractional Fourier-domain filtering architecture. perform the encryption decryption by randomly spatial frequency of image then recombining information from in Fourier domain with pure random-intensity-encoded masks their complements scheme. The can be implemented iteratively an electro-optical setup. Numerical simulations have verified validity algorithm.

We propose an asymmetric optical image encryption scheme that uses amplitude and phase mixture retrieval of the Yang-Gu algorithm. The process is realized by employing a cascaded algorithm together with two random masks serve as public keys. private keys are generated in randomly distributed binary matrices to be used for performing one-way modulations. Without keys, illegal users cannot retrieve secret image. Numerical simulations carried out demonstrate validity security proposed scheme.

We proposed two noise-robust iterative methods for phase retrieval and diffractive imaging based on the Pauta criterion smoothness constraint. The work is to address noise issue plaguing application of algorithms in coherent diffraction imaging. It demonstrated by numerical analysis experimental results that our have higher accuracy faster convergence speed at a high shot level. Moreover, they are proved hold superiority cope with other kinds noises. Due inconvenience conventional iteration...

The vortex beam carrying orbital angular momentum (OAM) has attracted great attentions in optical communication field, which can extend the channel capacity of system due to orthogonality between different OAM modes. Generally, atmospheric turbulence distort helical phase fronts beams, presents a critical challenge effective recognition Recently, convolutional neural network (CNN), as model deep learning, been widely applied machine vision. In this paper, based on CNN theory, we make...

We propose and demonstrate a dual-channel surface plasmon resonance (SPR) sensor based on the side-polished D-type optical fiber, which is available for simultaneous measurement of refractive index (RI) temperature. The single mode fiber (SMF) to remove cladding plated layer gold film polished excite SPR effect. RI sensing characters are researched by simulation experiment. sensitivity increases from 1543 nm/RIU 6300 as increasing 1.333 1.410. Besides, wavelength red-shifts about 40 nm...

Increasing concerns over the use of antimicrobial growth promoters in animal production has prompted need to explore natural alternatives such as phytogenic compounds and probiotics. Citrus EOs have potential be used an alternative antibiotics animals. The purpose this research was study antibacterial antioxidant activities five citrus EOs, grapefruit essential oil (GEO), sweet orange EO (SEO), bergamot (BEO), lemon (LEO) their active component d-limonene (DLEO). chemical composition...

We propose to achieve and enhance the magnon blockade effect in an optomechanical-magnetic system based on a quantum destructive interference mechanism between three indirect transition pathways. By introducing degenerate parametric amplifier, we analytically obtain optimal gain phase for achieving blockade. Under optimized parameter conditions, driving detunings of cavity modes can be flexibly controlled smallest second-order correlation function. Moreover, exhibit fascinating features by...

We propose a new image encryption algorithm based on generalized fractional Fourier transform, to which we refer as multifractional transform. encrypt the input simply by performing transform with two keys. Numerical simulation results are given verify algorithm, and an optical implementation setup is also suggested.

We demonstrate that hollow Gaussian beams can be obtained from Fourier transform of the differentials a beam, and thus they generated by spatial filtering in domain with filters consist binomial combinations even-order Hermite polynomials. A typical 4f optical system Michelson interferometer type are proposed to implement scheme. Numerical results have proved validity effectiveness this method. Furthermore, other polynomial also using This approach is simple may find significant applications...

We propose a novel random fractional Fourier transform by randomizing the kernel function of conventional transform. The inherits excellent mathematical properties from and can be easily implemented in optics. As primary application directly used optical image encryption decryption. double phase encoding schemes thus modeled with cascaded transformers.

Based on an optical gyrator transform system, image encryption algorithm is designed and studied. An original secret regarded as the output intensity of second transform. A coherent nonuniform beam converted into input first Gerchberg-Saxton phase retrieval employed for obtaining compensation phases in pair. The are encrypted key this algorithm. parameters laser can serve additional method. decryption process be achieved with system. Numerical simulations performed to test validity capability

A novel multi-focusing metalens in the longitudinal direction has been proposed and investigated based on equal optical path principle, which is independent incident polarizations can be suitable for both of linear circular polarization incidences simultaneously. Here, three designing principles: partitioned mode, radial alternating mode angular have firstly constructing different types metalenses. The performances designed metalenses methods also analyzed detail, intensity ratio focusing...

A new mathematical model of dark-hollow beams, described as hollow sinh-Gaussian (HsG) has been introduced. The intensity distributions HsG beams are characterized by a single bright ring along the propagation whose size is determined order beams; shape can be controlled beam width and this leads to elliptical beams. Propagation characteristics through an ABCD optical system have researched, they regarded superposition series Hypergeometric-Gaussian (HyGG) As numerical example, in free space...