Optics and Lasers in Engineering最新文献

{"title":"Development of an optical microactuator based on thermocavitation for the drop-on-demand deposition of viscous fluids","authors":"Eduardo Rosales-Cortes ,&nbsp;Juan Castillo-Mixcóatl ,&nbsp;Placido Zaca-Morán ,&nbsp;Julio César Ramírez-San-Juan ,&nbsp;Rúben Ramos-García ,&nbsp;Paola Guadalupe Gordillo-Guerra ,&nbsp;Jóse Gabriel Ortega-Mendoza ,&nbsp;Juan Pablo Padilla-Martínez","doi":"10.1016/j.optlaseng.2025.109382","DOIUrl":"10.1016/j.optlaseng.2025.109382","url":null,"abstract":"<div><div>We present the design and experimental validation of an optical microactuator based on vapor microbubbles induced by a continuous wave laser in a highly absorbing solution. This optically driven system enables controlled drop-on-demand deposition of viscous fluids without the need for mechanical pumps or moving parts. It is a promising alternative to traditional techniques for handling high-viscosity fluids and deposition on unconventional substrates. The study details the design and fabrication of a dual-chamber microfluidic device, the experimental conditions, and a theoretical analysis of the behaviour of the deposited fluid using dimensionless numbers. To evaluate the performance of the optical device and the effects of viscosity and surface tension on the deposition quality, experiments were performed with liquids of different physical properties (deionised water, propylene glycol and SAE 40 oil). The results obtained show that the deposited microdroplet size mainly depends on the size of the vapor bubble, while the viscosity plays a crucial role in the deposition uniformity. The optical microactuator proved to be particularly effective with propylene glycol, where the depositions are reproducible within a working range, which is confirmed by the theoretical analysis. This work introduces a low-cost and versatile optical method for fluid actuation and microdroplet generation, offering promising applications in microfluidics, biofabrication, and laser-based material processing. The dual-chamber design thermally isolates the solution to be deposited from the laser interaction zone, allowing safe manipulation of thermally sensitive materials such as bio-inks or cell-laden suspensions. This opens up new opportunities for biomedical applications.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"196 ","pages":"Article 109382"},"PeriodicalIF":3.7,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deep learning based wavefront sensing for high quality projection lens from defocused point spread functions","authors":"M. Peterek ,&nbsp;D. Koutný ,&nbsp;P. Pokorný ,&nbsp;M. Pokorný ,&nbsp;J. Brzobohatý ,&nbsp;B. Stoklasa ,&nbsp;J. Novák","doi":"10.1016/j.optlaseng.2025.109369","DOIUrl":"10.1016/j.optlaseng.2025.109369","url":null,"abstract":"<div><div>One of the options for evaluating the image quality and fine alignment of optical systems is the use of phase retrieval methods. However, real-time alignment is not possible due to high computational complexity and numerical errors. This paper aims to analyze the possibility of real-time quantitative evaluation of the wave aberration function of a designed, high-quality optical system (OS) from a set of noisy PSF images around focus using a convolutional deep learning neural network (DLNN). Working at a wavelength of 405 nm with a numerical aperture of <span><math><mi>N</mi><mi>A</mi><mo>=</mo><mn>0.279</mn></math></span>, we have prepared a large set of simulated noisy PSF data using the Extended Nijboer-Zernike (ENZ) diffraction theory and performed training and verification of the proposed DLNN models for wave aberration retrieval. The advantage presented on simulated datasets over classical phase retrieval methods is significantly reduced evaluation time due to a pre-trained DLNN and analysis of the accuracy of the diffraction model used. The retrieved aberrations set a limit to the wave aberration function and make the proposed method a suitable candidate for optical workshop metrology, challenging further development.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"196 ","pages":"Article 109369"},"PeriodicalIF":3.7,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Misalignment measurement using circular grating moiré fringes via high-order phase harmonics","authors":"Yaoxu Yan ,&nbsp;Jiantao Yan ,&nbsp;Bin Lin ,&nbsp;Zhebo Chen","doi":"10.1016/j.optlaseng.2025.109377","DOIUrl":"10.1016/j.optlaseng.2025.109377","url":null,"abstract":"<div><div>High-accuracy misalignment measurement with a large range remains challenging in lithography. Although overlapping circular gratings generate isotropic moiré fringes capable of two-dimensional measurement, their complex phase variations limit accuracy and practical applications. We propose a novel displacement measurement method using circular gratings that eliminates the prerequisite of knowing reference centers. This method incorporates previously neglected high-order harmonics, thereby enhancing measurement accuracy. First, the intensity of moiré fringes is modeled as a polynomial amplitude-modulated sinusoidal signal, whose coefficients enable efficient phase extraction via linear least-squares algorithms. Then, maximum likelihood estimation integrates high-order angular harmonic amplitudes of the phase measured at multiple origin positions, yielding precise and robust displacement measurements. The results demonstrate that incorporation of the second harmonic significantly improves performance over linear methods based on windowed Fourier transform and wavelet transform, achieving sub-<figure><img></figure> experimental accuracy and sub-<figure><img></figure> theoretical accuracy. The flexible parameter selection enables a trade-off between precision and robustness across diverse grating periods and sizes. This framework expands the versatility and applicability of circular gratings, demonstrating their substantial potential for misalignment measurement.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"196 ","pages":"Article 109377"},"PeriodicalIF":3.7,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145223034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cycle-consistent physical constraint deep learning for incoherent self-interference digital holographic reconstruction","authors":"Wanbin Zhang ,&nbsp;Yijian Feng ,&nbsp;Yanchen Ren ,&nbsp;Xiangdong Sun ,&nbsp;Rupert Young ,&nbsp;Zhanjun Zhang","doi":"10.1016/j.optlaseng.2025.109385","DOIUrl":"10.1016/j.optlaseng.2025.109385","url":null,"abstract":"<div><div>We propose a novel incoherent holographic adaptive reconstruction network. This network employs a dual-input fully connected architecture for adaptive feature optimization and introduces an innovative iterative optimization framework to address physical consistency constraints. By using cyclic consistency loss with nonlinear deconvolution embedding, our method achieves a significant improvement over traditional reconstruction methods, realizing a 41.42% enhancement in lateral resolution while increasing the peak signal-to-noise ratio of the reconstructed images by 3.2 times. Comprehensive evaluations conducted on the DIV2K dataset demonstrate that our approach maintains exceptional reconstruction quality compared to existing supervised learning models. This method enables high-quality single-shot holographic reconstruction under data-scarce conditions, offering potential applications for real-time biological imaging and industrial inspection.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"196 ","pages":"Article 109385"},"PeriodicalIF":3.7,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of binary blazed grating couplers based on cascaded residual neural networks","authors":"Qingqing Feng,&nbsp;Zhe Ji,&nbsp;Shiru Fu,&nbsp;Haoran Yu","doi":"10.1016/j.optlaseng.2025.109373","DOIUrl":"10.1016/j.optlaseng.2025.109373","url":null,"abstract":"<div><div>Focusing on improving the inverse design method of binary blazed grating couplers to achieve high design efficiency and low error, this work investigates three approaches: a cascaded neural network, an improved cascaded residual network, and particle swarm optimization (PSO). Firstly, a comprehensive training dataset was obtained through electromagnetic simulations, and model hyperparameters were determined. The ordinary cascaded neural network required a training time of 33,944 s, achieving a relative error of 0.12. To enhance both design efficiency and accuracy, an improved cascaded residual neural network model was developed. By introducing residual connections, it effectively mitigated issues of gradient vanishing and gradient explosion. With this improvement, the training time was significantly reduced to 3737 s, and the relative error was lowered to 0.08. Additionally, PSO was applied to optimize the grating coupler. Using a population size of 50 and performing 100 iterations, the optimization process required approximately 45,000 s, a maximum coupling efficiency of 47.37%. A comprehensive comparison of these methods demonstrates that the improved cascaded residual network exhibits significant advantages in both training time and relative error. This highlights its great potential for significantly improving the inverse design efficiency and accuracy of binary blazed grating couplers.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"196 ","pages":"Article 109373"},"PeriodicalIF":3.7,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic diversity-driven hierarchical particle swarm optimization method for edge distortion compensation in digital lithography mask optimization","authors":"Shengzhou Huang ,&nbsp;Dongjie Wu ,&nbsp;Jiani Pan ,&nbsp;Yongkang Shao ,&nbsp;Siwen He","doi":"10.1016/j.optlaseng.2025.109379","DOIUrl":"10.1016/j.optlaseng.2025.109379","url":null,"abstract":"<div><div>Digital micromirror device (DMD) lithography suffers from edge distortions caused by micromirror discretization and diffraction effects. To address this challenge, this study proposed a diversity-driven hierarchical particle swarm optimization (PSO) method for high-fidelity mask optimization. The algorithm integrated tri-level population dynamics with adaptive diversity control to overcome premature convergence. Validation on CEC2005 and CEC2022 benchmarks demonstrated exceptional accuracy, including near-zero errors on multimodal functions. For 30*30 test patterns masks, pattern error (PE) reduced 91.8% with structural similarity index measure (SSIM) exceeding 0.99 at 5.59 s average runtime. For 100*100 complex masks, PE decreased 67.3% with SSIM above 0.97 at 72.57 s average runtime. This framework provided an efficient and effective solution for achieving high quality image in digital lithography.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"196 ","pages":"Article 109379"},"PeriodicalIF":3.7,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polarization resolved deep ultraviolet microscopy for label free imaging with enhanced nuclei and fiber contrast","authors":"Jiabin Chen ,&nbsp;Ruilin You ,&nbsp;Marco Contreras ,&nbsp;Haijiang Cai ,&nbsp;Yuanyuan Sun ,&nbsp;Yihan Wang ,&nbsp;Bofan Song ,&nbsp;Stanley Pau ,&nbsp;Zhihan Hong ,&nbsp;Rongguang Liang","doi":"10.1016/j.optlaseng.2025.109375","DOIUrl":"10.1016/j.optlaseng.2025.109375","url":null,"abstract":"<div><div>Deep ultraviolet (DUV) microscopy is a rapid, label-free imaging technique widely used in biological applications. However, fibrillar structures, which provide crucial insights into tissue organization, are often overlooked. In this work, we introduce a polarization-resolved DUV microscope capable of extracting both nuclear and fiber features. Illumination at 265 nm enhances nuclear contrast, while polarization imaging reveals fiber orientation. Four images are captured sequentially to calculate the linear polarization properties of the tissue medium. To address pixel misalignment between multiple images, we apply adaptive local thresholds to extract valid features for precise registration. The degree of linear polarization and angle of polarization exhibit significant changes as light passes through tissue samples, revealing variations in polarization states. This additional polarization contrast offers a new dimension of analysis, potentially enhancing the characterization of biological tissues.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"196 ","pages":"Article 109375"},"PeriodicalIF":3.7,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of stress during 3.8 μm laser mitigating damage growth on fused silica","authors":"Guobin Zhang ,&nbsp;Chang Liu ,&nbsp;Shengtian Liu ,&nbsp;Zhou Guo ,&nbsp;Yunxiang Pan ,&nbsp;Zhonghua Shen ,&nbsp;Nan Zhao ,&nbsp;Tu Xu ,&nbsp;Jian Lu","doi":"10.1016/j.optlaseng.2025.109381","DOIUrl":"10.1016/j.optlaseng.2025.109381","url":null,"abstract":"<div><div>The residual stress following mid-to-far infrared laser mitigation of fused silica damage results in crack growth and reduces the lifetime of fused silica. Understanding the evolution of stress during laser mitigation is essential for advancing laser repair technologies. In this study, an experimental setup was established to measure the real-time stress distribution during 3.8 μm mid-infrared laser irradiation, aiming at mitigating damage growth on fused silica. The experimental results indicate that the evolution of the principal stress can be divided into three distinct stages based on the state of the material. After the material was heated and melted, the principal stress distribution could be classified further into three directional layers. Additionally, a mechanical model of the interaction between the 3.8 μm laser and fused silica was developed to investigate the depth-dependent stress distribution during mitigation. The simulation results demonstrated that the maximum principal stress was consistently compressive, with a larger compressive stress occurring inside the fused silica.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"196 ","pages":"Article 109381"},"PeriodicalIF":3.7,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A high-performance biosensor based on quasi-bound states in the continuum for the detection of bacterial species in water","authors":"Jabir Hakami ,&nbsp;Abdelhak Dhibi ,&nbsp;Ridha Bellouz ,&nbsp;Nordin Felidj ,&nbsp;Nadia Djaker","doi":"10.1016/j.optlaseng.2025.109376","DOIUrl":"10.1016/j.optlaseng.2025.109376","url":null,"abstract":"<div><div>We propose a high-performance quasi-bound state in the continuum (quasi-BIC) optical biosensor for the label-free detection of bacterial species in aqueous media. The sensor exploits the redshift of a sharp resonance peak in response to variations in the effective refractive index. Six clinically relevant bacterial species (P. aeruginosa, B. anthracis, E. faecalis, E. coli, S. haemolyticus, and S. aureus) were analyzed across volume fractions from 0% to 100%, corresponding to an index range of 1.3330–1.4160 RIU. The biosensor was rigorously simulated using the Fourier Modal Method (FMM), demonstrating high sensitivity (up to 297.60 nm/RIU), an ultra-narrow FWHM of 0.4 nm, and high quality factors reaching 2451. Additionally, the design achieved a maximum detection accuracy of 2.5 nm⁻¹, a limit of detection as low as 3.36 × 10⁻⁴ RIU, and excellent figures of merit: FoM up to 739.13 RIU⁻¹, dip FoM up to 1.488 × 10⁶ nm/RIU⁻¹, and CSF up to 738.91 RIU⁻¹. Comparative analysis with recent literature confirms that the proposed biosensor outperforms existing designs across all major metrics. Its high resolution, broad index sensitivity range, and robustness make it a promising platform for real-time, label-free bacterial sensing in biomedical and environmental applications.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"196 ","pages":"Article 109376"},"PeriodicalIF":3.7,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hybrid phase screen modeling and experimental study of Gaussian beam propagation and imaging under oceanic turbulence","authors":"Xiao Meng ,&nbsp;Datai Hui ,&nbsp;Shun Zhou ,&nbsp;Weiguo Liu","doi":"10.1016/j.optlaseng.2025.109380","DOIUrl":"10.1016/j.optlaseng.2025.109380","url":null,"abstract":"<div><div>Underwater optical imaging with Gaussian beams offers high resolution and sensitivity, but its performance is significantly affected by oceanic turbulence. Conventional phase screen models lack sufficient physical considerations, which limit their accuracy in predicting beam properties and imaging quality under oceanic turbulence. Here, we present a hybrid random phase screen model that integrates a power spectrum-based approach with the Zernike polynomials method to better represent the entire spatial frequency domain of oceanic turbulence. Numerical simulations are performed to investigate how variations in the mean-square temperature dissipation rate (<span><math><msub><mi>X</mi><mi>T</mi></msub></math></span>), the kinetic energy dissipation rate (<span><math><mrow><mi>ε</mi></mrow></math></span>), the temperature-salinity ratio (<span><math><mi>ω</mi></math></span>) and the Kolmogorov microscale length (<span><math><mi>η</mi></math></span>) influence beam propagation and imaging quality. The results demonstrate that stronger oceanic turbulence is governed by the higher values of <span><math><msub><mi>X</mi><mi>T</mi></msub></math></span>, <span><math><mi>ω</mi></math></span>, <span><math><mi>η</mi></math></span> and lower value of <span><math><mrow><mi>ε</mi></mrow></math></span>, resulting in increased beam spot wandering and edge diffusion during propagation, leading to a decrease in central maximum intensity of the beam. Besides, the modulation transfer functions (MTF) of the imaging systems under oceanic turbulence decrease as the values of <span><math><msub><mi>X</mi><mi>T</mi></msub></math></span>, <span><math><mi>ω</mi></math></span>, <span><math><mi>η</mi></math></span> increase and <span><math><mrow><mi>ε</mi></mrow></math></span> decreases, reflecting the intensified impact of oceanic turbulence. To verify the model, an experimental platform with controlled oceanic turbulence parameters was constructed. The experimental results show good agreement with the simulation results, where the beam exhibits increased wandering and broadening, accompanied by a decrease in peak intensity with increasing temperature gradients, salinity, and injection height. This work provides theoretical and experimental support for evaluating beam propagation and imaging performance in oceanic turbulence.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"196 ","pages":"Article 109380"},"PeriodicalIF":3.7,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}