IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-09-16 DOI: 10.1016/j.ijleo.2024.172040

{"title":"A closely spaced dual band polarization insensitive FSS for 5G applications","authors":"","doi":"10.1016/j.ijleo.2024.172040","DOIUrl":"10.1016/j.ijleo.2024.172040","url":null,"abstract":"<div><div>This study presents a novel single layer Frequency Selective Surface (FSS) for fifth generation (5G) applications with a polarization independent closely spaced dual band response. The proposed design consists of four split ring apertures etched on a square patch printed on a RT5880 dielectric substrate. The FSS has two stop-bands at 24.78 GHz and 28 GHz center frequencies with attenuations around 55 dB. The S21<−10 dB bandwidths (BW) of these bands are 14.48 % and 9.25 %, respectively and these closely spaced bands succeed 1.13 frequency ratio. It shows a stable frequency response for both TE and TM polarizations. Furthermore, the FSS represents a single layered and quite thin (thickness 0.042<span><math><msub><mrow><mi>λ</mi></mrow><mrow><mi>l</mi></mrow></msub></math></span>) structure with its unit cell size (0.70<span><math><msub><mrow><mi>λ</mi></mrow><mrow><mi>l</mi></mrow></msub></math></span> × 0.70<span><math><msub><mrow><mi>λ</mi></mrow><mrow><mi>l</mi></mrow></msub></math></span>, where <span><math><msub><mrow><mi>λ</mi></mrow><mrow><mi>l</mi></mrow></msub></math></span> is the free-space wavelength at lower frequency). The novelty of the presented FSS is not only achieving a small closely spaced band ratio in the mmWave band and exhibiting polarization insensitivity but also providing these features with a simple geometry and, uncomplicated single layer structure. The simulation results were confirmed by well accordant measurement results. All these results make the presented FSS a good candidate for 5G electromagnetic interference (EMI) shielding applications.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142315475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

TB-mBJ for doping concentration effects on magneto-optical properties in ZnMnxSn(1−x)As2 spintronics materials 掺杂浓度对 ZnMnxSn（1-x）As2 自旋电子材料磁光特性影响的 TB-mBJ

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-09-16 DOI: 10.1016/j.ijleo.2024.172039

{"title":"TB-mBJ for doping concentration effects on magneto-optical properties in ZnMnxSn(1−x)As2 spintronics materials","authors":"","doi":"10.1016/j.ijleo.2024.172039","DOIUrl":"10.1016/j.ijleo.2024.172039","url":null,"abstract":"<div><p>An investigation for electronic, magnetic, and optical properties of Mn-doped <span><math><msub><mrow><mi>ZnSnAs</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> compound performed using advanced computational methods. Using spin-polarized density functional theory (DFT) calculations with local orbital linearized augmented plane wave (lo-LAPW) method and Tran–Blaha’s modified Becke–Johnson (TB-mBJ) functional, Mn-doped n-type chalcopyrite semiconductor <span><math><mrow><msub><mrow><mi>ZnMn</mi></mrow><mrow><mi>x</mi></mrow></msub><msub><mrow><mi>Sn</mi></mrow><mrow><mrow><mo>(</mo><mn>1</mn><mo>−</mo><mi>x</mi><mo>)</mo></mrow></mrow></msub><msub><mrow><mi>As</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span>, studied within varying Mn doping concentration range <span><math><mrow><mn>0</mn><mo>≤</mo><mi>x</mi><mo>≤</mo><mn>0</mn><mo>.</mo><mn>5</mn></mrow></math></span>. Doping of Mn to Sn site in pure <span><math><msub><mrow><mi>ZnSnAs</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> creates a strong spin effect, which makes it useful spintronic materials. We observed with increase the Mn concentration in <span><math><msub><mrow><mi>ZnSnAs</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span>, energy bandgap changes while the magnetic strength of the unit cell remains unchanged, showing stability of system’s magnetism. Optical properties of the Mn doped <span><math><msub><mrow><mi>ZnSnAs</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> compounds analysed in term of dielectric function, absorption spectra, and refractive index. Optical properties show, compound is optically low active in the Infrared (IR) region and more active in visible and ultraviolet (UV) region. The electronic and optical properties of Mn-doped <span><math><msub><mrow><mi>ZnSnAs</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span>, offer potential technological advancements in semiconductor device design technology and engineering.</p></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142270324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Averaging fractional Fourier domains for background noise removal applied to digital lensless holographic microscopy 应用于数字无透镜全息显微镜的去除背景噪声的平均分数傅立叶域

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-09-12 DOI: 10.1016/j.ijleo.2024.172035

{"title":"Averaging fractional Fourier domains for background noise removal applied to digital lensless holographic microscopy","authors":"","doi":"10.1016/j.ijleo.2024.172035","DOIUrl":"10.1016/j.ijleo.2024.172035","url":null,"abstract":"<div><p>A background noise removal method based on averaging fractional Fourier domains is presented. The method is applied to Digital Lensless Holographic Microscopy (DLHM) intensity reconstructions, where the background is perturbed by the weak yet detrimental presence of information of the twin image. A set of fractional Fourier domains of a DLHM intensity reconstruction is computed and thereafter averaged leading to a sensible reduction of the background noise and, therefore, an increase in the overall contrast of the resulting image. The maximum reach of the fractional rotations used in the method is determined by measuring the spatial resolution in a regular star test target such that the spatial resolution is kept within the span of interest for a given application. The set of images to be averaged is composed of fractional rotations of the original intensity reconstruction that are smaller than the previously determined maximum reach. The number of fractional rotations that are finally averaged is determined by the sought increase in the contrast of the resulting image. Experimental samples of micrometer-sized objects and an intricate biological specimen have been used to validate the proposal.</p></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142239899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SRARDA: A lightweight adaptive residual dense attention generative adversarial network for image super-resolution SRARDA：用于图像超分辨率的轻量级自适应残差密集注意力生成对抗网络

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-09-11 DOI: 10.1016/j.ijleo.2024.172034

{"title":"SRARDA: A lightweight adaptive residual dense attention generative adversarial network for image super-resolution","authors":"","doi":"10.1016/j.ijleo.2024.172034","DOIUrl":"10.1016/j.ijleo.2024.172034","url":null,"abstract":"<div><p>Image super-resolution (SR) is the task of inferring a high resolution (HR) image from one/multiple single low resolution (LR) input(s). Traditional networks are evaluated by pixel-level metrics such as Peak-Signal-to-Noise Ratio (PSNR) etc., which do not always align with human perception of image quality. They often produce excessively smooth images that lack high-frequency texture and appear unnatural. Therefore, in this paper, we propose a lightweight adaptive residual dense attention generative adversarial network (SRARDA) for image SR. Firstly, our generator adopts the residual in residual (RIR) structure but redesigns the basic module. By using dynamic residual connection (ARC) to dynamically adjust the importance of residual and main paths, we design a novel adaptive residual dense attention block (ARDAB) that enhances the feature extraction capability of the generator. In addition, we build a high-frequency filtering unit (HFU) to extract more high-frequency features from the LR space. Finally, to fully utilize the discriminator, we use WGAN to compute the difference between the HR image and the reconstructed image. Experiments demonstrate that SRARDA effectively addresses the issue of excessive smoothing in reconstructed images, while also enhancing visual quality.</p></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142229258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Generation of circular symmetric Airy vortex beams based on spin-multiplexed metasurface 基于自旋复用元面的圆形对称艾里涡旋束的生成

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-09-10 DOI: 10.1016/j.ijleo.2024.172021

引用次数: 0

PCB defect detection algorithm based on deep learning 基于深度学习的 PCB 缺陷检测算法

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-09-10 DOI: 10.1016/j.ijleo.2024.172036

引用次数: 0

Studies on InZnMgO amorphous buffer layer for Cu(In,Ga)(S,Se)2 solar cell 用于 Cu(In,Ga)(S,Se)2 太阳能电池的 InZnMgO 非晶缓冲层研究

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-09-08 DOI: 10.1016/j.ijleo.2024.172027

{"title":"Studies on InZnMgO amorphous buffer layer for Cu(In,Ga)(S,Se)2 solar cell","authors":"","doi":"10.1016/j.ijleo.2024.172027","DOIUrl":"10.1016/j.ijleo.2024.172027","url":null,"abstract":"<div><p>This study explores the effectiveness of an amorphous buffer layer, specifically Indium Zinc Magnesium Oxide (IZMO), as an alternative buffer in Copper Indium Gallium Sulfide Selenide (CIGSSe) solar cells. The findings reveal a significant impact on efficiency through precise adjustment of the Mg/(In+Zn+Mg) ratio (MIZM) from 0 to 0.23. The bandgap exhibits a consistent increase with an ascending Mg/(In+Zn+Mg) ratio, transitioning from 3.42 eV to 3.63 eV for IZMO prepared with Ar and from 3.18 eV to 3.53 eV for IZMO prepared with an Ar+O<sub>2</sub> gas mixture, respectively. This rise is attributed to the augmentation of the conduction band minimum (<em>E</em><sub>C</sub>) of IZMO resulting from the addition of MgO. Moreover, an increase in the Mg/(In+Zn+Mg) ratio correlates with improved conversion efficiency, escalating from 6.31 % to 9.19 %. Notably, the open-circuit voltage experiences a rise from 0.430 V to 0.520 V. This is attributed to the heightened <em>E</em><sub>C</sub> of IZMO due to MgO addition, which mitigates recombination between the light-absorbing layer and the buffer layer, consequently elevating the open circuit voltage. The addition of MgO also enhances the resistance of the buffer layer, contributing to an increase in shunt resistance and a subsequent decrease in leakage current. Conversely, IZMO introduced with O<sub>2</sub> exhibits inferior performance akin to IZO, attributable to substantial sputter damage induced by O<sub>2</sub> introduction.</p></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142195000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Probing the electronic ground state of the nitrogen-vacancy center in nanodiamonds at room temperature 室温下探测纳米金刚石中氮空位中心的电子基态

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-09-08 DOI: 10.1016/j.ijleo.2024.172038

{"title":"Probing the electronic ground state of the nitrogen-vacancy center in nanodiamonds at room temperature","authors":"","doi":"10.1016/j.ijleo.2024.172038","DOIUrl":"10.1016/j.ijleo.2024.172038","url":null,"abstract":"<div><p>The color centers in diamonds are promising candidates in the context of quantum information science, quantum computation, and spin-based quantum sensors due to their spin-dependent optical transitions. The manipulation and optical readout of electronic spin state is measured using a technique known as optically detected magnetic resonance (ODMR). Here, we discuss the indigenous development of ODMR setup to coherently manipulate and precise readout of spin state of nitrogen-vacancy centers (NV) in nanodiamond at room-temperature. The study involves the confocal mapping of an ensemble of NV centers to measure spin state-dependent optical transition by applying an optical excitation and microwave field simultaneously. The spin state control appears as a dip at 2.87 GHz in the measured emission intensity spectra as a function of microwave frequency. An ODMR contrast of 3.4 % is achieved at the NV center emission maximum of 660 nm and an inhomogeneous dephasing time of 0.03 microseconds. We find an inherent small split in the ODMR dip which is induced by local strain in nanodiamonds. The split becomes stronger while applying an external magnetic field, which forms the basis of NV center-based magnetometry. The results are useful for spin-based microwave-optical quantum transducers, quantum sensing, and quantum memory devices.</p></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142239898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring the influence of Zn impurities on the structural, optical, and H2 sensor properties of ultrasonic spray pyrolysis-grown MgO thin films 探索锌杂质对超声喷雾热解生长的氧化镁薄膜的结构、光学和 H2 传感器特性的影响

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-09-08 DOI: 10.1016/j.ijleo.2024.172026

引用次数: 0

Impact of altering phase modulation and geometrical shape of laser beam via a phase-only spatial light modulator on laser-induced fluorescence 通过纯相位空间光调制器改变激光束的相位调制和几何形状对激光诱导荧光的影响

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-09-07 DOI: 10.1016/j.ijleo.2024.172037

{"title":"Impact of altering phase modulation and geometrical shape of laser beam via a phase-only spatial light modulator on laser-induced fluorescence","authors":"","doi":"10.1016/j.ijleo.2024.172037","DOIUrl":"10.1016/j.ijleo.2024.172037","url":null,"abstract":"<div><p>This study investigates the impact of modulating and shaping a laser beam via a phase-only spatial light modulator (SLM) on the intensity of the laser-induced fluorescence (LIF) signal. Different phase modulations ranging from 0 to <span><math><mrow><mn>2</mn><mi>π</mi></mrow></math></span> are applied to the SLM window to evaluate the effect of the modulated beam on the emitted LIF signal from extra virgin olive oil EVOO samples. The laser beam is also shaped into circular and square geometries with varying diameters to determine the optimum size for maximizing the LIF signal strength. The results reveal that the highest LIF signal intensity could be obtained after modulating the incident laser beam with phase shifts of 0 and <span><math><mrow><mn>2</mn><mi>π</mi></mrow></math></span>, with an improvement factor of approximately 3 for Avanti olive oil and 1.42 for Al Jouf olive oil. Furthermore, laser beam shaping into a circular aperture with a radius of 2.45 mm or a square aperture with a side length of 2.45 mm yields the highest LIF signal improvement, with enhancement factors of approximately 2.9 for Avanti olive oil and 1.42 for Al Jouf olive oil. This work demonstrates the potential of SLM-based beam shaping techniques to optimize LIF measurements by tailoring the wavefront characteristics of the excitation laser source.</p></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142168375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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