The metalens has vast applications in biomedicine and industrial manufacturing due to their ultrathin structure vital ability manipulate the properties of light waves for long-infrared systems. However, it is difficult achieve confocal function with high focusing efficiency, wide wavelength bandwidth, low structural complexity. Here, we propose experimentally demonstrate an all-silicon dielectric composed arrays minimalist meta-atoms a single rectangular nanopillar arranged on periodic...

In this work, a simple dielectric metasurface hologram is proposed and designed by combining the electromagnetic vector analysis method immune algorithm, which can realize holographic display of dual wavelength orthogonal-linear polarization light in visible band, solve problem low efficiency traditional design hologram, effectively improve diffraction hologram. The titanium dioxide nanorod based on rectangular structure optimized designed. When x-linear polarized with 532 nm y-linear 633...

The multi-channel perfect vortex (PV) array based on metasurface has important applications in optical communication, particle manipulation, quantum optics, and other fields due to its ultra-thin structure excellent wavefront control ability. However, it is very challenging utilize a single simultaneously achieve independent channel PV arrays at different wavelengths with low crosstalk structural complexity. Here, we propose design rectangular structured TiO 2 , achieving beam...

In this paper, a novel method of subwavelength binary simple periodic rectangular structure is presented to realize even beam splitting by combining the rigorous couple-wave analysis with genetic algorithm. Several splitters in terahertz region were designed and one silicon-based separate incident into four emergent beams has total efficiency up 92.23 %. Zero-order diffraction was reduced less than 0.192 % error uniformity decreased 6.51 × 10−6. These results break limitation based on...

An azimuth-tuned tri-color shift device based on an embedded subwavelength one-dimensional rectangular structure with single period is proposed. High reflection efficiencies for both TE and TM polarizations can be achieved simultaneously. Under oblique incidence of 60°, the reach up to 85, 86, 100 % in blue (azimuth 24°), green 63°), red 90°) waveband, respectively. Furthermore, laws influence period, groove depth, coating thickness, incident angle characteristics are investigated exposed,...

In this paper, an optical correlator which adopts planar integrated 2F structure and optimal tradeoff synthetic discriminant function filter is proposed to improve the system integration recognition ability. The specialized digital microlens designed for replace physical lens. By theoretical analysis, structural design conditions parameters of are given, volume 63.1 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> only half 4F...

A neural network model is constructed according to 4F optical correlator. New filter obtained by training the network. For recognition of distortion targets, correlation peaks from correlator applying new are averagely increased up 306.7% than OTSDF filter, and higher, sharper easier be distinguished, which indicates with have better performance in invariant recognition.

It is difficult for optical correlator to recognize the target with large rotation distortion by using existing filters. To solve this problem, a new neural network model constructed based on physical recognition process of planar integrated 2F correlator. The filter optimized training network. can output sharp correlation peaks targets arbitrary distortion. Compared traditional OTSDF filter, average increase peak index up 1402.4%, while performance invariant also better than NNCRF filter....

In this paper, a silicon-based terahertz wideband filter was designed using rigorous couple wave theory to achieve high diffraction efficiency and filtering performance. The optimal parameters, such as period, duty ratio, groove depth, are given. design value tolerance analysis were carried out obtain the allowable deviation range of each structural parameter filter. device fabricated tested for experimental results consistent with results, proving feasibility method can be applied in...

A novel method is presented in this paper to realize terahertz even beam splitting by using a subwavelength binary simple periodic rectangular structure, for making comprehensive application of both the RCWA (Rigorous Couple-Wave Analysis) and GA (Genetic Algorithm). By applying RCWA, efficiency each diffraction order can be numerically solved structure parameters. To design an splitter with find optimal duty cycle f, period d, grating depth h1 substrate thickness h2 approach minimum...

To improve the performance of existing guided-mode resonance (GMR) anti-counterfeiting grating, a tri-color shift device based on one-dimensional (1D) singly periodic rectangular structure and ZnS film is reported. By turning azimuths, proposed exhibits shifts blue, green, red for both TE TM polarizations simultaneously. As natural light can be considered as superposition polarizations, in order to achieve azimuth-tuned red, wavebands magnitudes reflection peaks should designed at three that...

Insufficient anti-counterfeiting performance and difficulties in manufacturing lead to degradation of the subwavelength rectangular structure grating, when it is applied field optical anti-counterfeiting. To solve problem, an embedded one-dimensional simple periodic sinusoidal grating proposed this paper replace previous with a structure. By using equivalent medium theory, we find that whose duty ration 0.5 has same effective refractive index as Then parameters are obtained based on...

The orbital angular momentum (OAM) multiplexing holography has the advantages of large information capacity and high security, important application value in holographic storage, optical encryption, computing. However, as number channels increases, this technology suffers from deterioration image quality, which limits its scope. This article proposes an innovative design that introduces diffractive neural network (ODNN) into OAM holography, establishes a scientific quality evaluation...

In deep underground engineering, it is inevitable that portions of the rock mass will be subjected to erosion and chemical corrosion infiltrating water. A comprehensive study physical, mechanical, energetic properties rocks after hydrochemical crucial for ensuring stability mass. The novelty this research lies in detailed investigation macroscopic microscopic morphologies exposed various corrosive solutions, as well changes physical mechanical parameters. Utilizing weighting method, a...

In this paper, we propose a new method to realize both polarization-multiplexing and wavelength-multiplexing using simple structure, which can hologram by the multiplexing of double wavelengths polarization in visible band. Our design reduce color cross-talk have higher diffraction efficiency. We transmission metasurface composed rectangular cells. Firstly, establish relationship structural parameters with phase under various incident conditions light beams. Then fitness function that...

Multi-wavelength confocal lens is an indispensable part of optical system, the traditional system often added by a certain number lenses, or uses different combination lenses materials to implement multi-wavelength co-focusing,making possess larger volume and weight, which, however, difficult meet requirements for high integration miniaturization system. As element composed two-dimensional planar subwavelength micro-element structure, metalens has advantages flatness, ultra-thinness...

Optical diffractive neural network (ODNN) uses light wave as a computing medium to perform the inference and prediction function of network, which has advantages high speed, low power consumption, parallel processing. In this work, an ODNN with only three layers phase modulation is designed, method improve recognition performance based on first-order spectral distribution targets proposed. Using method, parameters three-layer are effectively optimized optimal pixel size, diffraction...