Results in Optics最新文献_第9页

A broadband dual-polarized antenna for 5G wireless communication systems 用于 5G 无线通信系统的宽带双极化天线

Results in Optics Pub Date : 2024-03-17 DOI: 10.1016/j.rio.2024.100659

N. Sathishkumar , Rajesh Natarajan , D. Divya , S. Divya

引用次数: 0

Analysis of the effect of deep-profile compressive residual stress induced by laser peening on fatigue strength of 7075 aluminum alloy 激光强化诱导的深剖面压缩残余应力对 7075 铝合金疲劳强度的影响分析

Results in Optics Pub Date : 2024-03-17 DOI: 10.1016/j.rio.2024.100658

Takeshi Watari , Yuta Kine , Masahiko Mitsubayashi , Yuki Kabeya , Takashi Kurita , Ryo Yoshimura , Katsuya Hirano , Toshiyuki Kawashima

引用次数: 0

Silicon solar cell efficiency improvement employing electrostatically assembled polyelectrolyte–quantum dot multilayers 利用静电组装聚电解质-量子点多层膜提高硅太阳能电池效率

Results in Optics Pub Date : 2024-03-16 DOI: 10.1016/j.rio.2024.100655

Jose Raul Montes-Bojorquez , Maria F. Villa-Bracamonte , Omar J. Castillo , Arturo A. Ayon

{"title":"Silicon solar cell efficiency improvement employing electrostatically assembled polyelectrolyte–quantum dot multilayers","authors":"Jose Raul Montes-Bojorquez , Maria F. Villa-Bracamonte , Omar J. Castillo , Arturo A. Ayon","doi":"10.1016/j.rio.2024.100655","DOIUrl":"https://doi.org/10.1016/j.rio.2024.100655","url":null,"abstract":"<div>Down-shifting (DS) has proven to be an effective technique to address thermalization losses in photovoltaic devices. It involves the modification of the incident solar spectrum by luminescent species to better suit solar cell’s optimal absorption regions. Despite the number of favorable characteristics of quantum dots (QDs) as DS materials, their incorporation into highly ordered close-packed films remains the major drawback of QD-based DS applications. This limitation can be overcome by the sequential integration of QDs into a multilayered film via the layer-by-layer assembly technique, that allows the precise control of composition and thickness. The experimental results discussed herein indicate that upon optimization employing a model-assisted design approach, the spectral response of a silicon solar cell benefits from the down-shifting and antireflection capabilities of the QD film, as evinced by their quantum efficiency. For the optimum design, the incorporation of QDs triggered an increment of 26.1% in the power conversion efficiency driven by an increase of 29.2% in the short circuit current density. The controlled assembly of QD multilayers offers unique opportunities in light harvesting for new hybrid photovoltaic technologies.</div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S266695012400052X/pdfft?md5=6f763a9d6c6bfbf212cb9ea8a16cbbda&pid=1-s2.0-S266695012400052X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140163737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stabilization of hollow Gaussian beams in nonlinear metamaterial waveguides 稳定非线性超材料波导中的空心高斯光束

Results in Optics Pub Date : 2024-03-15 DOI: 10.1016/j.rio.2024.100654

M.P. Mohamed Nishad , Ishfaq Ahmad Bhat , A.K. Shafeeque Ali , T.P. Rashid

引用次数: 0

Design of microwave metamaterial absorber for Ku-, X-, and C- band applications 为 Ku、X 和 C 波段应用设计微波超材料吸收器

Results in Optics Pub Date : 2024-03-13 DOI: 10.1016/j.rio.2024.100653

H. Sudarsan , K. Mahendran , S. Rathika

{"title":"Design of microwave metamaterial absorber for Ku-, X-, and C- band applications","authors":"H. Sudarsan , K. Mahendran , S. Rathika","doi":"10.1016/j.rio.2024.100653","DOIUrl":"https://doi.org/10.1016/j.rio.2024.100653","url":null,"abstract":"<div>In the microwave domain, a compact, polarization- and angle-insensitive, ultrathin three-band metamaterial absorber (MMA) is designed, fabricated, and investigated in this article. The two copper layers are sandwiched between a FR4 substrate. In order to mitigate the term “perfect MMA,” the proposed unit cell structure with patches achieves practically good absorption at the Ku, X, and C bands. The proposed absorber comprises a square, circular and octagon shape patches at the boundary. At the relevant frequencies of 15.29 GHz (Ku-band), 8.59 GHz (X-band), and 6.09 GHz (C-band), the structure offers 99.9 %, 85 %, and 95 % absorptivity. Along with its ultrathin form, the structure's size is on the order of 10 × 10 × 0.8 mm3. Patches in the boundary patterns of squares, circular, and octagonal are present in the suggested absorber. Transverse electric (TE) and transverse magnetic (TM) waves exhibit the same absorptivity. Plots of the electric field (E-field), magnetic field (M-field), and surface current distributions are used to study the structure's physical workings. The stability of the suggested design is further supported by the various incidence and polarisation angles. Finally, it is found that the results from simulation and measurement are in good agreement. The sensing mechanism of the patch structure is also investigated by placing the analyte on top of it. The recommended framework will be useful for biosensors.</div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666950124000506/pdfft?md5=b39d91fdfe5a8912db5ab0374adf78ca&pid=1-s2.0-S2666950124000506-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140134786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Azimuthal Fourier decomposition for loss analysis of hollow-core tube lattice fibers part I: Ideal fibers 用于空芯管格光纤损耗分析的方位傅立叶分解法 I 部分：理想光纤

Results in Optics Pub Date : 2024-03-12 DOI: 10.1016/j.rio.2024.100657

Federico Melli , Kostiantyn Vasko , Lorenzo Rosa , Fetah Benabid , Luca Vincetti

引用次数: 0

About the approximation of a field of an extended source by a sphere wave in the far illumination region 关于在远照区用球面波近似扩展光源场的问题

Results in Optics Pub Date : 2024-03-11 DOI: 10.1016/j.rio.2024.100652

A.Zh. Khachatrian

引用次数: 0

Enhanced upconversion emission in Nd, Yb, Er and Ho tetra-doped Y2O3 phosphor 掺杂 Nd、Yb、Er 和 Ho 四种元素的 Y2O3 荧光中的增强型上转换发射

Results in Optics Pub Date : 2024-03-11 DOI: 10.1016/j.rio.2024.100656

Harsha S. Deshmukh, Gajanan G. Muley

{"title":"Enhanced upconversion emission in Nd, Yb, Er and Ho tetra-doped Y2O3 phosphor","authors":"Harsha S. Deshmukh, Gajanan G. Muley","doi":"10.1016/j.rio.2024.100656","DOIUrl":"https://doi.org/10.1016/j.rio.2024.100656","url":null,"abstract":"<div>Yb3+, Nd3+, Er3+ and Ho3+ tetra ions doped Y2O3 upconversion phosphors have been prepared by the combustion route. Crystalline phase purity and cubic phase of prepared samples have been confirmed from powder X-ray diffraction study. Absorbance of samples over spectral range 200–1100 nm has been measured by diffuse reflectance spectroscopy. All samples exhibit large band gaps. Scanning electron micrograph analysis reveals spherical morphology of particles and sizes around 200 nm. Upconversion emission has been studied under a 980 nm diode laser excitation with 166 mW laser power. The Ho3+, Nd3+ and Yb3+ co-doped Y2O3 phosphor show very high emission intensity of a green band centred at around 550 nm and another moderate intensity red band centred on 667 nm, while reverse is the case for Er3+, Nd3+ and Yb3+ co-doped Y2O3 phosphor. Er3+, Ho3+, Nd3+ and Yb3+ co-doped Y2O3 phosphor show enhanced high emission intensity in both green and red bands. These two bands are not visible in Nd3+ and Yb3+ co-doped Y2O3 phosphor but show weak upconversion emission at 549, 568 and 799 nm. Owing to the high emission intensity of green band, Ho3+, Nd3+ and Yb3+ co-doped Y2O3 phosphor may find potential applications in medical and security, while Er3+, Ho3+, Nd3+ and Yb3+ co-doped phosphor showing enhanced upconversion in green and red bands may find applications in white light generation.</div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666950124000531/pdfft?md5=69105d6527f9b4e17cac28397e516df8&pid=1-s2.0-S2666950124000531-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140113175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wavelength multiplexing system based on ring resonators 基于环形谐振器的波长复用系统

Results in Optics Pub Date : 2024-03-11 DOI: 10.1016/j.rio.2024.100651

Gonçalo Alves Cavaco , Ricardo A. Marques Lameirinhas , Catarina P. Correia V. Bernardo , João Paulo N. Torres , António Baptista

{"title":"Wavelength multiplexing system based on ring resonators","authors":"Gonçalo Alves Cavaco , Ricardo A. Marques Lameirinhas , Catarina P. Correia V. Bernardo , João Paulo N. Torres , António Baptista","doi":"10.1016/j.rio.2024.100651","DOIUrl":"https://doi.org/10.1016/j.rio.2024.100651","url":null,"abstract":"<div>Wavelength Division Multiplexing, WDM, is a technology developed for applications in telecommunications with the purpose of combining numerous wavelength signals into one single fibre. The aim of this research is the characterization of WDM systems of ring resonators with planar optical waveguides. The optical responses for different configurations, dimensions, and materials are analysed by doing a parametric study both considering analytical expressions and a Finite Element Tool. The results are from add-drop topologies with one, two and three rings. The main difference between topologies with the same parameters is the number of resonance wavelengths, which is higher due to the increase in the number of ring-shaped waveguides. It is concluded that adjusting the rings’ dimensions, the resonant wavelengths are tuned. Furthermore, the higher the rings’ radius the lower is the free spectral range, that can take values from 40 nm to 90 nm. Then, the number of resonant peaks in a wavelength range may change. Also, 1500–5000 describes the values computed for the quality factor, whereas the full width at half maximum varies within some units of nanometres. For models with different core materials, the higher transmittances decrease with lower core refractive indexes and the resonance width increases. These are new degrees of freedom to tune the response of the device that can definitely work as optical wavelength multiplexer, having losses from 20% to 40% considering the transmitted optical power.</div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666950124000488/pdfft?md5=96fd42651cb5f69cc50dde7c0c0612e0&pid=1-s2.0-S2666950124000488-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140113176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Temperature measurement of overlapped fiber Bragg grating sensors in a series fiber sensor network 串联光纤传感器网络中重叠光纤布拉格光栅传感器的温度测量

Results in Optics Pub Date : 2024-03-07 DOI: 10.1016/j.rio.2024.100649

Sugumar Venkatesan , Manju Mohan , Pandian Chelliah

引用次数: 0