Optik最新文献_第2页

Optomechanical entanglement induced by backward stimulated Brillouin scattering 后向受激布里渊散射诱导的光机械纠缠

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2024-11-04 DOI: 10.1016/j.ijleo.2024.172097

P. Djorwé , A.-H. Abdel-Aty , K.S. Nisar , S.G.N. Engo

We propose a scheme to generate robust optomechanical entanglement, i.e., the entanglement between a mechanical and an optical modes. This scheme is based on a Backward Stimulated Brillouin Scattering (BSBS) process, which is hosted within an optomechanical structure. Our benchmark system consists of an acoustic (mechanical) mode coupled to two optical modes through an electrostrictive (radiation pressure) effect. After determining the optimal acoustic parameters allowing the entanglement in our system, we have shown that both the acoustic coupling and the decay rate require a certain threshold from where the optomechanical entanglement is generated. For instance, to generate an optomechanical entanglement in our proposal, the strength of the used acoustic decay rate most exceed both the mechanical and optical decay rates, which is the figure of merit of our proposal. The generated entanglement is robust enough against thermal fluctuation. Our work provides a new scheme for entanglement generation based on BSBS effect, and can be extended to microwaves and hybrid optomechanical structures. Such a generated entangled states can be used for quantum information processing, quantum sensing, and quantum computing.

我们提出了一种产生稳健光机械纠缠（即机械模式和光学模式之间的纠缠）的方案。该方案基于后向受激布里渊散射（BSBS）过程，并将其置于光机械结构中。我们的基准系统包括通过电致伸缩（辐射压力）效应耦合到两个光学模式的声学（机械）模式。在确定了允许在我们的系统中产生纠缠的最佳声学参数之后，我们已经证明，声学耦合和衰减率都需要一定的阈值才能产生光机械纠缠。例如，要在我们的方案中产生光机纠缠，所使用的声衰减率强度必须超过机械和光学衰减率，这就是我们方案的优点。生成的纠缠对热波动有足够的鲁棒性。我们的工作为基于 BSBS 效应的纠缠生成提供了一种新方案，并可扩展到微波和混合光机电结构。这种生成的纠缠态可用于量子信息处理、量子传感和量子计算。

{"title":"Optomechanical entanglement induced by backward stimulated Brillouin scattering","authors":"P. Djorwé , A.-H. Abdel-Aty , K.S. Nisar , S.G.N. Engo","doi":"10.1016/j.ijleo.2024.172097","DOIUrl":"10.1016/j.ijleo.2024.172097","url":null,"abstract":"<div><div>We propose a scheme to generate robust optomechanical entanglement, i.e., the entanglement between a mechanical and an optical modes. This scheme is based on a Backward Stimulated Brillouin Scattering (BSBS) process, which is hosted within an optomechanical structure. Our benchmark system consists of an acoustic (mechanical) mode coupled to two optical modes through an electrostrictive (radiation pressure) effect. After determining the optimal acoustic parameters allowing the entanglement in our system, we have shown that both the acoustic coupling and the decay rate require a certain threshold from where the optomechanical entanglement is generated. For instance, to generate an optomechanical entanglement in our proposal, the strength of the used acoustic decay rate most exceed both the mechanical and optical decay rates, which is the figure of merit of our proposal. The generated entanglement is robust enough against thermal fluctuation. Our work provides a new scheme for entanglement generation based on BSBS effect, and can be extended to microwaves and hybrid optomechanical structures. Such a generated entangled states can be used for quantum information processing, quantum sensing, and quantum computing.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"319 ","pages":"Article 172097"},"PeriodicalIF":3.1,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656039","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

Optimization of C-like sandwich wall structure for high microwave transmission 用于高微波传输的 C 型夹层壁结构优化

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2024-11-01 DOI: 10.1016/j.ijleo.2024.172096

Manal M. Al-Ali , Abd Alghany Jaradat , Ahmed M. Al-Khateeb , Sami H. Mahmood

A multilayered structure of five planar slabs ((Glass epoxy/PU Foam/Vacuum/PU Foam/Glass epoxy) was investigated for broadband microwave propagation. In this study, theoretical calculations of the transmittance, reflectance and absorbance characteristics of the multilayer structure were carried out using the ABCD transfer matrix method, and numerical calculations were obtained using the COMSOL Multiphysics simulation software. The propagation characteristics were investigated as a function of frequency up to the Ka-band and versus angle of incidence ranging from normal to grazing incidence. The results of the theory and simulation were in excellent agreement. The average transmittance for unpolarized or circularly polarized wave was 97% over the S to the K bands, whereas up to 86% transmission was observed at the end of the Ka-band. Higher than 95% transmission of incident waves with frequency 10 GHz was observed over a wide range of angles of incidence up to

70 °

, after which the transmittance decreased sharply to zero at a grazing incidence (

θ_{1} = 90 °

). The results revealed that the absorbance is negligibly small and the incident energy was either transmitted or reflected. The reflectance for both TE and TM wave modes increased appreciably in the angular range

75 ° \leq θ_{1} \leq 90 °

and approached 100% at grazing incidence. The curves of the reflectance versus angle of incidence for representative frequencies in the S and X bands revealed a Brewster-like effect for the TM wave mode, while the reflectance of the TE mode varied monotonically, without showing a minimum characteristic of a Brewster-like reflectionless condition.

研究了由五块平面板（玻璃环氧树脂/聚氨酯泡沫/真空/聚氨酯泡沫/玻璃环氧树脂）组成的多层结构的宽带微波传播。在这项研究中，使用 ABCD 传递矩阵法对多层结构的透射率、反射率和吸收率特性进行了理论计算，并使用 COMSOL Multiphysics 仿真软件进行了数值计算。研究了从频率到 Ka 波段的传播特性，以及从法线入射到掠入射的入射角。理论和模拟结果非常吻合。从 S 波段到 K 波段，非极化或圆极化波的平均透过率为 97%，而在 Ka 波段末端观察到的透过率高达 86%。在高达 70° 的宽入射角范围内，频率为 10 GHz 的入射波的透射率高于 95%，此后，在掠入射角（θ1=90°）处，透射率急剧下降至零。结果表明，吸收率非常小，入射能量要么被传输，要么被反射。在 75°≤θ1≤90°的角度范围内，TE 波和 TM 波模式的反射率明显增加，在掠入射时接近 100%。S 波段和 X 波段代表性频率的反射率随入射角变化的曲线显示，TM 波模式具有类似布儒斯特的效应，而 TE 波模式的反射率则单调变化，没有显示出类似布儒斯特的无反射条件的最小特征。

{"title":"Optimization of C-like sandwich wall structure for high microwave transmission","authors":"Manal M. Al-Ali , Abd Alghany Jaradat , Ahmed M. Al-Khateeb , Sami H. Mahmood","doi":"10.1016/j.ijleo.2024.172096","DOIUrl":"10.1016/j.ijleo.2024.172096","url":null,"abstract":"<div><div>A multilayered structure of five planar slabs ((Glass epoxy/PU Foam/Vacuum/PU Foam/Glass epoxy) was investigated for broadband microwave propagation. In this study, theoretical calculations of the transmittance, reflectance and absorbance characteristics of the multilayer structure were carried out using the ABCD transfer matrix method, and numerical calculations were obtained using the COMSOL Multiphysics simulation software. The propagation characteristics were investigated as a function of frequency up to the Ka-band and versus angle of incidence ranging from normal to grazing incidence. The results of the theory and simulation were in excellent agreement. The average transmittance for unpolarized or circularly polarized wave was 97% over the S to the K bands, whereas up to 86% transmission was observed at the end of the Ka-band. Higher than 95% transmission of incident waves with frequency 10 GHz was observed over a wide range of angles of incidence up to <span><math><mrow><mn>70</mn><mo>°</mo></mrow></math></span>, after which the transmittance decreased sharply to zero at a grazing incidence (<span><math><mrow><msub><mrow><mi>θ</mi></mrow><mrow><mn>1</mn></mrow></msub><mo>=</mo><mspace></mspace><mn>90</mn><mo>°</mo></mrow></math></span>). The results revealed that the absorbance is negligibly small and the incident energy was either transmitted or reflected. The reflectance for both TE and TM wave modes increased appreciably in the angular range <span><math><mrow><mn>75</mn><mo>°</mo><mo>≤</mo><msub><mrow><mi>θ</mi></mrow><mrow><mn>1</mn></mrow></msub><mo>≤</mo><mn>90</mn><mo>°</mo></mrow></math></span> and approached 100% at grazing incidence. The curves of the reflectance versus angle of incidence for representative frequencies in the S and X bands revealed a Brewster-like effect for the TM wave mode, while the reflectance of the TE mode varied monotonically, without showing a minimum characteristic of a Brewster-like reflectionless condition.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"318 ","pages":"Article 172096"},"PeriodicalIF":3.1,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593556","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

Novel reddish-orange emitting BaBPO5:Eu3+ phosphor for n-UV warm white-LEDs: Synthesis and study of structural and spectroscopic investigations 用于 n-UV 暖白光 LED 的新型橘红色发光 BaBPO5:Eu3+ 荧光粉：结构和光谱的合成与研究

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2024-10-30 DOI: 10.1016/j.ijleo.2024.172103

T. Chandra Mohan , T. Raghu Raman , K. Venkata Rao , P. Sai Dinesh , Y.C. Ratnakaram

A novel reddish-orange emitting 2Ba_2-xO-B₂O₃-P₂O₅:xEu³⁺ (x= 0.04, 0.06, 0.08, 0.10, 0.12 and 0.14 mol%) phosphor with different concentrations of Eu³⁺ ions were synthesized through high temperature solid-state reaction technique. The crystal structure has been studied by X-ray diffraction technique for all the concentrations of Eu³⁺ ions. The morphology and elemental analysis of the optimal ∼0.1 mol% concentration was examined by the SEM-EDS images. The functional groups were analysed by the FTIR characterization technique. The thermal properties were studied by the TGA-DSC analysis. The energy band gap of all the samples were analysed by using UV–VIS DRS technique. The photoluminescence properties of BaBPO₅:Eu³⁺ phosphor with different concentrations of Eu³⁺ ions were investigated at λ_em = 611 nm and λ_ex = 394 nm. Variation in emission intensity with Eu³⁺ ion concentrations, phonon side bands, multi-phonon relaxation rate and energy transfer mechanisms were studied. The BaBPO₅:Eu³⁺ phosphors exhibit characteristic emission peaks corresponding to ⁵D₀ → ⁷F_J (J = 0, 1, 2, 3, 4) transitions of Eu³⁺ ions under n-UV excitation. Among all the transitions, ⁵D₀ → ⁷F₁ (593 nm) transition shows higher intensity and asymmetric ratio (R₂₁) for all concentrations of Eu³⁺ ions were calculated. The lifetimes of ⁵D₀ level of Eu³⁺ ions in BaBPO₅: Eu³⁺ phosphor were calculated by using fluorescent decay curve analysis. The CIE color coordinates reveal, reddish-orange emission in the low CCT range. These findings imply that BaBPO₅: 0.1Eu³⁺ phosphor is a promising candidate for solid-state lighting applications as well as phosphor-converted warm w-LEDs.

通过高温固态反应技术合成了含有不同浓度 Eu3+ 离子的新型橘红色发光 2Ba2-xO-B2O3-P2O5:xEu3+（x= 0.04、0.06、0.08、0.10、0.12 和 0.14 mol%）荧光粉。通过 X 射线衍射技术研究了所有 Eu3+ 离子浓度的晶体结构。通过扫描电镜-电子显微镜（SEM-EDS）图像对最佳浓度 ∼0.1 mol% 的形貌和元素分析进行了研究。傅立叶变换红外特性技术分析了官能团。热性能通过 TGA-DSC 分析进行了研究。使用 UV-VIS DRS 技术分析了所有样品的能带间隙。在 λem = 611 纳米和 λex = 394 纳米波长下，研究了不同浓度 Eu3+ 离子的 BaBPO5:Eu3+ 荧光粉的光致发光特性。研究了发射强度随 Eu3+ 离子浓度、声子边带、多声子弛豫速率和能量传递机制的变化。在正紫外激发下，BaBPO5:Eu3+荧光粉显示出与 Eu3+ 离子的 5D0 → 7FJ （J = 0、1、2、3、4）跃迁相对应的特征发射峰。在所有跃迁中，5D0 → 7F1（593 nm）跃迁的强度较高，计算得出所有浓度 Eu3+ 离子的不对称比（R21）。通过荧光衰减曲线分析，计算了 BaBPO5: Eu3+ 荧光粉中 Eu3+ 离子 5D0 电平的寿命。CIE 色坐标显示，在低 CCT 范围内，荧光呈橘红色。这些研究结果表明，BaBPO5: 0.1Eu3+ 荧光粉是固态照明应用以及荧光粉转换暖色发光二极管的理想候选材料。

{"title":"Novel reddish-orange emitting BaBPO5:Eu3+ phosphor for n-UV warm white-LEDs: Synthesis and study of structural and spectroscopic investigations","authors":"T. Chandra Mohan , T. Raghu Raman , K. Venkata Rao , P. Sai Dinesh , Y.C. Ratnakaram","doi":"10.1016/j.ijleo.2024.172103","DOIUrl":"10.1016/j.ijleo.2024.172103","url":null,"abstract":"<div><div>A novel reddish-orange emitting 2Ba<sub>2-x</sub>O-B<sub>2</sub>O<sub>3</sub>-P<sub>2</sub>O<sub>5</sub>:xEu<sup>3+</sup> (x= 0.04, 0.06, 0.08, 0.10, 0.12 and 0.14 mol%) phosphor with different concentrations of Eu<sup>3+</sup> ions were synthesized through high temperature solid-state reaction technique. The crystal structure has been studied by X-ray diffraction technique for all the concentrations of Eu<sup>3+</sup> ions. The morphology and elemental analysis of the optimal ∼0.1 mol% concentration was examined by the SEM-EDS images. The functional groups were analysed by the FTIR characterization technique. The thermal properties were studied by the TGA-DSC analysis. The energy band gap of all the samples were analysed by using UV–VIS DRS technique. The photoluminescence properties of BaBPO<sub>5</sub>:Eu<sup>3+</sup> phosphor with different concentrations of Eu<sup>3+</sup> ions were investigated at λ<sub>em</sub> = 611 nm and λ<sub>ex</sub> = 394 nm. Variation in emission intensity with Eu<sup>3+</sup> ion concentrations, phonon side bands, multi-phonon relaxation rate and energy transfer mechanisms were studied. The BaBPO<sub>5</sub>:Eu<sup>3+</sup> phosphors exhibit characteristic emission peaks corresponding to <sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>J</sub> (<em>J</em> = 0, 1, 2, 3, 4) transitions of Eu<sup>3+</sup> ions under n-UV excitation. Among all the transitions, <sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>1</sub> (593 nm) transition shows higher intensity and asymmetric ratio (R<sub>21</sub>) for all concentrations of Eu<sup>3+</sup> ions were calculated. The lifetimes of <sup>5</sup>D<sub>0</sub> level of Eu<sup>3+</sup> ions in BaBPO<sub>5</sub>: Eu<sup>3+</sup> phosphor were calculated by using fluorescent decay curve analysis. The CIE color coordinates reveal, reddish-orange emission in the low CCT range. These findings imply that BaBPO<sub>5</sub>: 0.1Eu<sup>3+</sup> phosphor is a promising candidate for solid-state lighting applications as well as phosphor-converted warm w-LEDs.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"318 ","pages":"Article 172103"},"PeriodicalIF":3.1,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593461","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

Autoencoder-based image fusion network with enhanced channels and feature saliency 基于自动编码器的图像融合网络，具有增强的通道和特征显著性

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2024-10-30 DOI: 10.1016/j.ijleo.2024.172104

Hongmei Wang , Xuanyu Lu , Ze Li

The existing deep learning based infrared and visible image fusion technologies have made significant progress, but there are still many problems need to be solved, such as information loss (targets and texture, etc.) of both infrared and visible images, noise and artifacts existing in fused image. To address these issues in fusion, an infrared and visible image fusion method based on autoencoder network is proposed in this paper. Firstly, novel enhanced channels are designed and input parallelly with source images into the network to enhance the specific features and reduce information loss in feature fusion. Then, the feature maps are obtained by the encoder. Next, a feature fusion method based on feature saliency is proposed, using a pre-trained classifier to measure the saliency of features, and the fused image is obtained by the decoder finally. Experimental results demonstrate that the targets are obvious and the textures are plentiful in the fused images generated by the proposed method. Also, the objective metrics of the proposed method are higher than the state of the art methods, which demonstrate that the proposed method is effective to fuse the infrared and visible images.

现有的基于深度学习的红外与可见光图像融合技术已取得重大进展，但仍有许多问题亟待解决，如红外图像和可见光图像的信息丢失（目标和纹理等）、融合图像中存在的噪声和伪影等。为了解决融合中的这些问题，本文提出了一种基于自动编码器网络的红外与可见光图像融合方法。首先，设计了新的增强信道，并将其与源图像并行输入网络，以增强特定的特征，减少特征融合中的信息损失。然后，通过编码器获得特征图。接着，提出一种基于特征显著性的特征融合方法，使用预先训练好的分类器来测量特征的显著性，最后由解码器得到融合后的图像。实验结果表明，该方法生成的融合图像目标明显，纹理丰富。同时，所提方法的客观指标也高于现有方法，这表明所提方法能有效地融合红外图像和可见光图像。

{"title":"Autoencoder-based image fusion network with enhanced channels and feature saliency","authors":"Hongmei Wang , Xuanyu Lu , Ze Li","doi":"10.1016/j.ijleo.2024.172104","DOIUrl":"10.1016/j.ijleo.2024.172104","url":null,"abstract":"<div><div>The existing deep learning based infrared and visible image fusion technologies have made significant progress, but there are still many problems need to be solved, such as information loss (targets and texture, etc.) of both infrared and visible images, noise and artifacts existing in fused image. To address these issues in fusion, an infrared and visible image fusion method based on autoencoder network is proposed in this paper. Firstly, novel enhanced channels are designed and input parallelly with source images into the network to enhance the specific features and reduce information loss in feature fusion. Then, the feature maps are obtained by the encoder. Next, a feature fusion method based on feature saliency is proposed, using a pre-trained classifier to measure the saliency of features, and the fused image is obtained by the decoder finally. Experimental results demonstrate that the targets are obvious and the textures are plentiful in the fused images generated by the proposed method. Also, the objective metrics of the proposed method are higher than the state of the art methods, which demonstrate that the proposed method is effective to fuse the infrared and visible images.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"319 ","pages":"Article 172104"},"PeriodicalIF":3.1,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656038","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

Design of freeform elements with a large exit pupil for AR display 为 AR 显示屏设计具有大出口瞳孔的自由形态元件

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2024-10-29 DOI: 10.1016/j.ijleo.2024.172101

Olga Afanaseva, Artem Solomashenko, Maria Shishova, Larisa Timashova, Gaik Sagatelyan, Ivan Tsyganov

This work presents an augmented reality display consisting of two freeform lenses. The first lens is composed of two aspherical polished surfaces and one plane surface, while the second lens acts as a compensator to allow distortion-free viewing of the surrounding area. One benefit of this design is the large size of the exit pupil, reaching up to 12 mm, and the low distortion value of 1.63 %. The optics has a thickness of 22 mm and is compatible with 0.49-in. diagonal displays. The field of view is limited to 28°, which is sufficient for various augmented reality applications.

该作品展示了一种由两个自由形态透镜组成的增强现实显示屏。第一个透镜由两个非球面抛光表面和一个平面组成，而第二个透镜则作为补偿器，可以无畸变地观察周围区域。这种设计的优点之一是出口瞳孔大，可达 12 毫米，畸变值低，仅为 1.63%。光学器件的厚度为 22 毫米，可与对角线为 0.49 英寸的显示器兼容。视场角限制在 28°，足以满足各种增强现实应用的需要。

引用次数: 0

Study of complex instability in a Thulium-doped figure-eight fiber laser including a polarization-imbalanced NOLM with no polarization control. 研究掺铥八字光纤激光器中的复杂不稳定性，包括无偏振控制的偏振不平衡 NOLM。

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2024-10-29 DOI: 10.1016/j.ijleo.2024.172100

L.A. Rodríguez-Morales , O. Pottiez , I. Armas-Rivera , L.M. González-Vidal , M. Durán-Sánchez , M.V. Hernández-Arriaga , M. Bello-Jiménez , J.P. Lauterio-Cruz , H.E. Ibarra-Villalon , J.C. Hernandez-Garcia

This study proposes a Thulium-doped figure-eight (F8) fiber laser design to be used as a platform to explore complex dynamics in passively mode-locked fiber laser systems. The proposed scheme incorporates a polarization-imbalanced nonlinear optical loop mirror (PI-NOLM) without a polarizer in the ring section. The absence of a polarizer prevents controlling the polarization state at the PI-NOLM input, which in turn allows the PI-NOLM switching power to vary dynamically during the laser operation. This leads to an intermittent noise-like pulse (NLP) operation, which is affected by complex instability in the form of non-periodic Q-switched-like behavior. Using real-time time-domain mapping techniques, we get a deep insight into the laser intricate dynamics, which involves not only NLPs, but also solitons and quasi-continuous-wave components with their subtle interactions. This study highlights the importance of the PI-NOLM in F8 laser schemes for the study and understanding of complex dynamics in Thulium-doped fiber lasers, which have been less extensively studied compared to other rare-earth-doped lasers. Our findings will contribute to the optimization and design of advanced laser systems for various scientific and industrial applications.

本研究提出了一种掺铥八字（F8）光纤激光器设计方案，并以此为平台探索无源锁模光纤激光器系统中的复杂动态。所提出的方案在环形部分采用了偏振不平衡非线性光学环镜（PI-NOLM），而没有偏振器。由于没有偏振器，无法控制 PI-NOLM 输入端的偏振状态，这反过来又使 PI-NOLM 的开关功率在激光器运行期间发生动态变化。这导致了间歇性的类噪声脉冲（NLP）运行，并受到非周期性 Q 开关行为形式的复杂不稳定性的影响。利用实时时域映射技术，我们深入了解了激光的复杂动态，其中不仅包括 NLP，还包括孤子和准连续波成分及其微妙的相互作用。这项研究强调了 F8 激光方案中的 PI-NOLM 对于研究和理解掺铥光纤激光器复杂动力学的重要性，与其他掺稀土激光器相比，对掺铥光纤激光器的研究还不够广泛。我们的研究结果将有助于各种科学和工业应用中先进激光系统的优化和设计。

{"title":"Study of complex instability in a Thulium-doped figure-eight fiber laser including a polarization-imbalanced NOLM with no polarization control.","authors":"L.A. Rodríguez-Morales , O. Pottiez , I. Armas-Rivera , L.M. González-Vidal , M. Durán-Sánchez , M.V. Hernández-Arriaga , M. Bello-Jiménez , J.P. Lauterio-Cruz , H.E. Ibarra-Villalon , J.C. Hernandez-Garcia","doi":"10.1016/j.ijleo.2024.172100","DOIUrl":"10.1016/j.ijleo.2024.172100","url":null,"abstract":"<div><div>This study proposes a Thulium-doped figure-eight (F8) fiber laser design to be used as a platform to explore complex dynamics in passively mode-locked fiber laser systems. The proposed scheme incorporates a polarization-imbalanced nonlinear optical loop mirror (PI-NOLM) without a polarizer in the ring section. The absence of a polarizer prevents controlling the polarization state at the PI-NOLM input, which in turn allows the PI-NOLM switching power to vary dynamically during the laser operation. This leads to an intermittent noise-like pulse (NLP) operation, which is affected by complex instability in the form of non-periodic Q-switched-like behavior. Using real-time time-domain mapping techniques, we get a deep insight into the laser intricate dynamics, which involves not only NLPs, but also solitons and quasi-continuous-wave components with their subtle interactions. This study highlights the importance of the PI-NOLM in F8 laser schemes for the study and understanding of complex dynamics in Thulium-doped fiber lasers, which have been less extensively studied compared to other rare-earth-doped lasers. Our findings will contribute to the optimization and design of advanced laser systems for various scientific and industrial applications.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"318 ","pages":"Article 172100"},"PeriodicalIF":3.1,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142579007","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

Holographic solar concentrator with wide band using multi-wavelength transmission grating 使用多波长透射光栅的宽带全息太阳能聚光器

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2024-10-29 DOI: 10.1016/j.ijleo.2024.172106

Hui-Ying Wu , Chang-Won Shin , Ki-Chul Kwon , Kwon-Yeon Lee , Sang-Keun Gil , Nam Kim

A multi-wavelength holographic grating using photopolymer is presented for a holographic solar concentrator system. Currently, volume holographic optical elements (HOEs) have been proposed for application in solar concentrators due to their advantages, such as lightweight, selective wavelength, and passive tracking. However, their efficiency depends on the central wavelength, which is determined by both the recording material and the recording angle. In this work, a transmission holographic grating with multiple wavelengths is proposed to enhance the performance of holographic solar concentrator systems. The diffraction efficiency and spectral range are significant factors in determining the concentrated efficiency of solar energy. The optimal efficiency of transmission grating is derived based on the optical characteristics of the photopolymer and the wavelength selectivity is then analyzed to compare the concentrated efficiency. The experimental results indicate that the dichromatic transmission grating with an average diffraction efficiency of 70 % and a wavelength band of 278 nm has a concentrated efficiency of 48.7 %. Compared to monochromatic and trichromatic holographic grating, dichromatic grating can concentrate more energy with a wider spectral band.

本文介绍了一种用于全息太阳能聚光器系统的光聚合物多波长全息光栅。目前，体积全息光学元件（HOE）因其重量轻、可选择波长和被动跟踪等优点，已被建议应用于太阳能聚光器中。然而，它们的效率取决于中心波长，而中心波长由记录材料和记录角度决定。本研究提出了一种具有多个波长的透射全息光栅，以提高全息太阳能聚光器系统的性能。衍射效率和光谱范围是决定太阳能聚光效率的重要因素。根据光聚合物的光学特性推导出透射光栅的最佳效率，然后分析波长选择性，比较聚光效率。实验结果表明，平均衍射效率为 70 %、波长带为 278 nm 的二色透射光栅的聚光效率为 48.7 %。与单色全息光栅和三基色全息光栅相比，二基色光栅能以更宽的光谱带集中更多的能量。

{"title":"Holographic solar concentrator with wide band using multi-wavelength transmission grating","authors":"Hui-Ying Wu , Chang-Won Shin , Ki-Chul Kwon , Kwon-Yeon Lee , Sang-Keun Gil , Nam Kim","doi":"10.1016/j.ijleo.2024.172106","DOIUrl":"10.1016/j.ijleo.2024.172106","url":null,"abstract":"<div><div>A multi-wavelength holographic grating using photopolymer is presented for a holographic solar concentrator system. Currently, volume holographic optical elements (HOEs) have been proposed for application in solar concentrators due to their advantages, such as lightweight, selective wavelength, and passive tracking. However, their efficiency depends on the central wavelength, which is determined by both the recording material and the recording angle. In this work, a transmission holographic grating with multiple wavelengths is proposed to enhance the performance of holographic solar concentrator systems. The diffraction efficiency and spectral range are significant factors in determining the concentrated efficiency of solar energy. The optimal efficiency of transmission grating is derived based on the optical characteristics of the photopolymer and the wavelength selectivity is then analyzed to compare the concentrated efficiency. The experimental results indicate that the dichromatic transmission grating with an average diffraction efficiency of 70 % and a wavelength band of 278 nm has a concentrated efficiency of 48.7 %. Compared to monochromatic and trichromatic holographic grating, dichromatic grating can concentrate more energy with a wider spectral band.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"318 ","pages":"Article 172106"},"PeriodicalIF":3.1,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593462","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

Bio-calcium oxide derived from eggshell-titanium dioxide@graphene oxide for photodegradation of dyes and antibacterial activities 蛋壳-二氧化钛@氧化石墨烯衍生的生物氧化钙在染料光降解和抗菌活性方面的应用

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2024-10-28 DOI: 10.1016/j.ijleo.2024.172099

Nguyen Huu Hieu , Ton That Buu , Nguyen Duy Hai , Vo Minh Quan , Bo Khanh Ngoc , Dang Hai Minh Tam , Nguyen Thanh Hoai Nam , Le Gia Han , Mai Thanh Phong

The utilization of calcium oxide (CaO) derived from calcined eggshells is considered a primary source of materials for semiconductor incorporation, which is a facile and environmentally friendly method. This work introduces a novel composite, namely calcium oxide-titanium dioxide@graphene oxide (CaO-TiO₂@GO) with photodegradation efficiency of various organic pollutants such as crystal violet (CV), malachite green (MG), rhodamine B (RhB), and methyl orange (MO). The results showed that the synergistic efficiency of the combination of GO and CaO-TiO₂ increased the adsorption-photodegradation efficiency with the removal of CV, MG, RhB, and MO of 99.72, 99.41, 97.21, and 80.09 %, respectively. The kinetics of dye photodegradation follows a pseudo-first-order kinetics model, the reusability toward CV removal reaches over 85 % after 5 cycles, and the free radical scavenging experiment identifies that the •O₂⁻ plays a major role in the photodegradation mechanism. In addition, the fundamental antibacterial performance toward strains of Pseudomonas aeruginosa and Bacillus subtilis was reported with antibacterial inhibition diameters of 12.1 and 11.2 mm, respectively.

利用从煅烧蛋壳中提取的氧化钙（CaO）被认为是掺入半导体的主要材料来源，这是一种既简便又环保的方法。本研究介绍了一种新型复合材料，即氧化钙-二氧化钛@氧化石墨烯（CaO-TiO2@GO），其对多种有机污染物如水晶紫（CV）、孔雀石绿（MG）、罗丹明 B（RhB）和甲基橙（MO）具有光降解效率。结果表明，GO 和 CaO-TiO2 的组合协同增效提高了吸附-光降解效率，对 CV、MG、RhB 和 MO 的去除率分别为 99.72%、99.41%、97.21% 和 80.09%。染料光降解动力学遵循伪一阶动力学模型，5 次循环后去除 CV 的重复利用率达到 85% 以上，自由基清除实验表明 -O2- 在光降解机理中起主要作用。此外，该化合物还对铜绿假单胞菌和枯草芽孢杆菌菌株具有基本的抗菌性能，抑菌直径分别为 12.1 毫米和 11.2 毫米。

{"title":"Bio-calcium oxide derived from eggshell-titanium dioxide@graphene oxide for photodegradation of dyes and antibacterial activities","authors":"Nguyen Huu Hieu , Ton That Buu , Nguyen Duy Hai , Vo Minh Quan , Bo Khanh Ngoc , Dang Hai Minh Tam , Nguyen Thanh Hoai Nam , Le Gia Han , Mai Thanh Phong","doi":"10.1016/j.ijleo.2024.172099","DOIUrl":"10.1016/j.ijleo.2024.172099","url":null,"abstract":"<div><div>The utilization of calcium oxide (CaO) derived from calcined eggshells is considered a primary source of materials for semiconductor incorporation, which is a facile and environmentally friendly method. This work introduces a novel composite, namely calcium oxide-titanium dioxide@graphene oxide (CaO-TiO<sub>2</sub>@GO) with photodegradation efficiency of various organic pollutants such as crystal violet (CV), malachite green (MG), rhodamine B (RhB), and methyl orange (MO). The results showed that the synergistic efficiency of the combination of GO and CaO-TiO<sub>2</sub> increased the adsorption-photodegradation efficiency with the removal of CV, MG, RhB, and MO of 99.72, 99.41, 97.21, and 80.09 %, respectively. The kinetics of dye photodegradation follows a pseudo-first-order kinetics model, the reusability toward CV removal reaches over 85 % after 5 cycles, and the free radical scavenging experiment identifies that the •O<sub>2</sub><sup>−</sup> plays a major role in the photodegradation mechanism. In addition, the fundamental antibacterial performance toward strains of <em>Pseudomonas aeruginosa</em> and <em>Bacillus subtilis</em> was reported with antibacterial inhibition diameters of 12.1 and 11.2 mm, respectively.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"318 ","pages":"Article 172099"},"PeriodicalIF":3.1,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142579008","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

Effects of the phase transition on the photoelectrochemical properties of CuFe2O4 composite photoelectrode 相变对 CuFe2O4 复合光电电极光电化学特性的影响

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2024-10-24 DOI: 10.1016/j.ijleo.2024.172095

Yaejin Hong , Jin Kyeong Kim , Jong Beom Kim , Hyukhyun Ryu , Won-Jae Lee

In this study, CuFe₂O₄ was grown using various Cu:Fe source molar ratios. The morphological, structural, electrical, and photoelectrochemical properties of CuFe₂O₄ photoelectrodes with different structural phases based on molar ratios were analyzed. XRD and XPS were performed to systematically analyze the relationship between the structural and photoelectrochemical properties of the photoelectrode. XRD analysis revealed the phase transformation of CuFe₂O₄ from cubic to tetragonal phase and back to cubic phase as the Cu:Fe source molar ratio was varied. The crystallinity of Cu-rich cubic-CuFe₂O₄ was found to be superior to that of tetragonal-CuFe₂O₄. XPS analysis showed that the Cu-rich cubic-CuFe₂O₄ sample has higher Cu and Fe binding energies and more oxygen vacancies than the tetragonal-CuFe₂O₄ sample, which helps reduce carrier recombination. Additionally, cubic-CuFe₂O₄ samples prepared in Cu-rich conditions demonstrated high flat-band potential and low charge transfer resistance values. As a result, the cubic-CuFe₂O₄ photoelectrode sample under the Cu-rich condition exhibited a relatively high photocurrent density value. The highest photocurrent density value (-0.38 mA/cm² at −0.55 V_SCE) was obtained with cubic-CuFe₂O₄ samples prepared under the Cu:Fe 3:1 condition.

本研究采用不同的 Cu:Fe 源摩尔比来生长 CuFe2O4。根据摩尔比分析了不同结构相的 CuFe2O4 光电极的形貌、结构、电学和光电化学特性。通过 XRD 和 XPS 系统分析了光电极的结构和光电化学特性之间的关系。XRD 分析表明，随着 Cu:Fe 源摩尔比的变化，CuFe2O4 发生了从立方相到四方相再回到立方相的相变。富铜立方氧化铜的结晶度优于四方氧化铜。XPS 分析表明，富铜立方-CuFe2O4 样品比四方-CuFe2O4 样品具有更高的铜和铁结合能以及更多的氧空位，这有助于减少载流子重组。此外，在富铜条件下制备的立方-CuFe2O4 样品具有较高的平带电位和较低的电荷转移电阻值。因此，富铜条件下的立方氧化铜铁氧体光电极样品表现出相对较高的光电流密度值。在 Cu:Fe 3:1 条件下制备的立方-CuFe2O4 样品获得了最高的光电流密度值（-0.55 VSCE 时为 -0.38 mA/cm2）。

{"title":"Effects of the phase transition on the photoelectrochemical properties of CuFe2O4 composite photoelectrode","authors":"Yaejin Hong , Jin Kyeong Kim , Jong Beom Kim , Hyukhyun Ryu , Won-Jae Lee","doi":"10.1016/j.ijleo.2024.172095","DOIUrl":"10.1016/j.ijleo.2024.172095","url":null,"abstract":"<div><div>In this study, CuFe<sub>2</sub>O<sub>4</sub> was grown using various Cu:Fe source molar ratios. The morphological, structural, electrical, and photoelectrochemical properties of CuFe<sub>2</sub>O<sub>4</sub> photoelectrodes with different structural phases based on molar ratios were analyzed. XRD and XPS were performed to systematically analyze the relationship between the structural and photoelectrochemical properties of the photoelectrode. XRD analysis revealed the phase transformation of CuFe<sub>2</sub>O<sub>4</sub> from cubic to tetragonal phase and back to cubic phase as the Cu:Fe source molar ratio was varied. The crystallinity of Cu-rich cubic-CuFe<sub>2</sub>O<sub>4</sub> was found to be superior to that of tetragonal-CuFe<sub>2</sub>O<sub>4</sub>. XPS analysis showed that the Cu-rich cubic-CuFe<sub>2</sub>O<sub>4</sub> sample has higher Cu and Fe binding energies and more oxygen vacancies than the tetragonal-CuFe<sub>2</sub>O<sub>4</sub> sample, which helps reduce carrier recombination. Additionally, cubic-CuFe<sub>2</sub>O<sub>4</sub> samples prepared in Cu-rich conditions demonstrated high flat-band potential and low charge transfer resistance values. As a result, the cubic-CuFe<sub>2</sub>O<sub>4</sub> photoelectrode sample under the Cu-rich condition exhibited a relatively high photocurrent density value. The highest photocurrent density value (-0.38 mA/cm<sup>2</sup> at −0.55 V<sub>SCE</sub>) was obtained with cubic-CuFe<sub>2</sub>O<sub>4</sub> samples prepared under the Cu:Fe 3:1 condition.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"318 ","pages":"Article 172095"},"PeriodicalIF":3.1,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553845","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

Effect of a quantum thermal machine on an entangled atomic system 量子热机对纠缠原子系统的影响

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik

Pub Date : 2024-10-24 DOI: 10.1016/j.ijleo.2024.172089

A. El Allati , Y. Khlifi , N. Metwally

In this contribution, we examine the effect of a quantum thermal machine on the behavior of two entangled atoms. It is shown that sudden changes (death/rebirth) in entanglement are predicted when increasing either the average rate of interaction coupling or the relative coupling. The maximum bounds of re-birthed entanglement decrease as machine parameters increase. Entanglement survival time can be increased as one reduces the average rate of interaction coupling. Due to the interaction, there will be an exchange of energies from the baths which may be a cool or hot flux. Therefore, the machine parameters can be used as controllers to switch between heating and refrigeration processes.

在这篇论文中，我们研究了量子热机对两个纠缠原子行为的影响。研究表明，当相互作用耦合的平均速率或相对耦合增加时，纠缠的突然变化（死亡/重生）是可以预测的。随着机器参数的增加，重生纠缠的最大边界会减小。随着交互耦合平均速率的降低，纠缠存活时间也会增加。由于相互作用，浴槽会产生能量交换，这可能是冷通量，也可能是热通量。因此，机器参数可用作控制器，在加热和制冷过程之间进行切换。

引用次数: 0