Indian Journal of Physics最新文献_第10页

Tunable optical properties of silicon nanowires for photovoltaic devices 光电器件用硅纳米线的可调光学特性

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2026-05-12 DOI: 10.1007/s12648-026-04055-y

Vrishty Kundu, Omita Nanda, Dalip Singh Mehta, Kanchan Saxena

{"title":"Tunable optical properties of silicon nanowires for photovoltaic devices","authors":"Vrishty Kundu, Omita Nanda, Dalip Singh Mehta, Kanchan Saxena","doi":"10.1007/s12648-026-04055-y","DOIUrl":"10.1007/s12648-026-04055-y","url":null,"abstract":"<div>In recent times, silicon nanowires (Si-NWs) have been primarily used as an inorganic layer in producing hybrid solar cells, mainly because of their enhanced optical absorption characteristics. This study utilizes the metal-assisted chemical etching (MACE) technology to produce vertically aligned, long Si-NWs with a high aspect ratio. The role of metal nanoparticles in the MACE technique was investigated, and the structure optimization process was performed by altering the etching time. Observations indicate that the concentration of metal solution influences both the size and spacing of Si-NWs, whereas the etching time affects the length of the Si-NWs. The optical characteristics of the Si-NWs were also examined utilizing the experimental diffuse reflection spectra. In addition, a 3D finite difference time domain (FDTD) simulation was conducted to analyse and compare the absorption spectra of the created Si-NWs with the experimental findings. Systematic analysis of absorption as a function of the geometry of nanowires (NWs) indicates that as the length and the diameter increase it demonstrates notable anti-reflection properties. This can be attributed to the larger surface area of the NWs and increased roughness/disordered surface. Hence, the work concisely illustrates the essential significance of improved absorption of Si-NWs in attaining optimal efficiency in hybrid solar cell applications.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"100 10","pages":"4405 - 4416"},"PeriodicalIF":1.7,"publicationDate":"2026-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 plasmon modes at chiral- black phosphorus interface 手性-黑磷界面等离子体模式的产生

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2026-05-07 DOI: 10.1007/s12648-026-04054-z

M. Nadeem, M. Umair, A. Ghaffar, Imran Shakir

引用次数: 0

Pattern of solar activity levels and their effects on galactic cosmic ray particle fluxes throughout 23rd and 24th solar cycle 第23和24个太阳活动周期的太阳活动水平模式及其对银河系宇宙射线粒子通量的影响

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2026-05-07 DOI: 10.1007/s12648-026-03984-y

Ahmad Yusof Abdo Jamal, Nurul Shazana Abdul Hamid, Idahwati Sarudin

{"title":"Pattern of solar activity levels and their effects on galactic cosmic ray particle fluxes throughout 23rd and 24th solar cycle","authors":"Ahmad Yusof Abdo Jamal, Nurul Shazana Abdul Hamid, Idahwati Sarudin","doi":"10.1007/s12648-026-03984-y","DOIUrl":"10.1007/s12648-026-03984-y","url":null,"abstract":"<div>Since the discovery of sunspots on the Sun’s surface, solar sunspot numbers (SSN) have been widely used to study solar activity (SA) and its cyclical behaviour. These cycles arise from processes in the Sun’s core and surface, which modulate SA intensity over time. Researchers commonly divide each solar cycle (SC) into distinct phases—minimum, inclining, maximum, and declining—each characterised by different activity levels. However, few studies have systematically characterised SA intensity across these phases, particularly in relation to space weather events and cosmic ray (CR) fluxes, both of which are strongly influenced by SA. This study investigated the variation of SSN, the F10.7 index, solar flare and geomagnetic storm frequencies, and CR particle intensities across SC23 and SC24. SC phases were defined using SSN and F10.7 data, after which all variables were composited by phase and analysed using phase-averaged values. A percentage difference analysis was also conducted to assess variability between the two cycles, while Spearman correlation was employed to evaluate the alignment between SA proxies, space weather, and CR particle fluxes. The results revealed coherent trends in SA proxies across the SC phases, with SC23 showing higher activity levels than SC24. Solar flare frequency aligned closely with SA phases, while geomagnetic storms showed a lag of one to two phases. Proton flux, helium flux, and neutron counts exhibited inverse correlations with SA proxies due to solar wind modulation, although solar energetic particles introduced minor irregularities. The study recommends further use of phase-based approaches in SA research to improve understanding of the Sun’s influence on space weather and CR variability.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"100 6","pages":"2165 - 2178"},"PeriodicalIF":1.7,"publicationDate":"2026-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148281080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Synthesis and long afterglow characteristics of Zn2GeO4:Mn2+, Pr3+ phosphors optimized by rotational compositedesign 旋转复合设计优化Zn2GeO4:Mn2+， Pr3+荧光粉的合成及长余辉特性

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2026-05-06 DOI: 10.1007/s12648-026-04051-2

Shengyi Liu, Duan Gao, Ying Zhu, Xin Chen, Xilai Zhang, Shizhuang Guo, Tianai Zhu, Li Wang, Wenbin Song, Haoyu Liu

{"title":"Synthesis and long afterglow characteristics of Zn2GeO4:Mn2+, Pr3+ phosphors optimized by rotational composite\u0000design","authors":"Shengyi Liu, Duan Gao, Ying Zhu, Xin Chen, Xilai Zhang, Shizhuang Guo, Tianai Zhu, Li Wang, Wenbin Song, Haoyu Liu","doi":"10.1007/s12648-026-04051-2","DOIUrl":"10.1007/s12648-026-04051-2","url":null,"abstract":"<div>To maximize the effective afterglow time of Zn2GeO4: Mn2+, Pr3+ phosphors, a second general rotational composite design strategy was employed to optimize the concentrations of Mn2+ and Pr3+. A quadratic regression equation model was established between the doping concentration of rare-earth ions Mn2+ and Pr3+ and the effective afterglow time. The theoretical optimal value of the effective afterglow time was precisely solved through a genetic algorithm. Using the high-temperature solid-state method, we successfully synthesized the phosphor Zn2GeO4: 0.5 mol% Mn2+, 2.3 mol% Pr3+ with the optimal doping concentration and performed detailed characterization and analysis. The results show that doping with Mn2+ and Pr3+ significantly improved the long afterglow properties of Zn2GeO4. Under 328 nm excitation, a characteristic emission peak at 535 nm was observed, and Zn2GeO4: Mn2+/Pr3+ exhibited an emission band corresponding to the 4T1 → 6A1 transition of Mn2+. In the Zn2GeO4: Mn2+/Pr3+ phosphor, Pr3+ substitution of Zn2+ generated positive defects of Pr′Zn and vacancy defects of V′′Zn. Furthermore, we measured the thermoluminescent properties of the optimal phosphor, calculating the trap depth to be 0.4608 eV, and discussed the relevant characteristics of long afterglow luminescence.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"100 9","pages":"3925 - 3934"},"PeriodicalIF":1.7,"publicationDate":"2026-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Synthesis and study of nonlinear optical properties of an enaminothione derived from enaminone and Lawesson’s reagent 由漆胺酮和Lawesson试剂衍生的漆胺硫酮的合成及非线性光学性质的研究

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2026-05-06 DOI: 10.1007/s12648-026-04052-1

Firas A. Nawar, Qusay M. A. Hassan, Bahjat A. Saeed, H. A. Sultan, C. A. Emshary

{"title":"Synthesis and study of nonlinear optical properties of an enaminothione derived from enaminone and Lawesson’s reagent","authors":"Firas A. Nawar, Qusay M. A. Hassan, Bahjat A. Saeed, H. A. Sultan, C. A. Emshary","doi":"10.1007/s12648-026-04052-1","DOIUrl":"10.1007/s12648-026-04052-1","url":null,"abstract":"<div>Lawesson’s reagent is used with β-enaminone to synthesize the compound (Z)-1,3-diphenyl-3-(phenylamino) prop-2-ene-1-thione. The 6–311 + + G(d,p) basis set is employed to evaluate the stability of the molecule’s probable tautomers via DFT with the functionals ωB97XD, M062X, B3LYP, and CAM-B3LYP. The ρBCP value for the hydrogen bond in the gas phase ranges from 0.035962 to 0.038105 e/a03. The intramolecular hydrogen bonding is relatively weak, as evidenced by atoms in molecules (AIM) computations conducted across several media and theoretical models. We examine the nonlinear optical (NLO) properties of enaminothione after illuminating with two continuous wave (CW) laser beams. We employ diffraction patterns (DPs) and the closed aperture (CA) Z-scan techniques to determine the nonlinear refractive index (NLRI) of enaminothione. The NLRI is equal 4.996 × 10–7 cm2/W at the wavelength 473 nm. The application of 473 nm and 532 nm laser beams on enaminothione has demonstrated its ability to transition between all-optical switching (AOS).</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"100 9","pages":"3935 - 3947"},"PeriodicalIF":1.7,"publicationDate":"2026-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Angle-tuned structural and optical properties of ZnTe thin films grown by glancing angle deposition 掠射角沉积ZnTe薄膜的角调谐结构和光学性能

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2026-05-04 DOI: 10.1007/s12648-026-03976-y

R. Zarei, M. H. Ehsani, R. Zarei Moghadam

引用次数: 0

Microwave dielectric dispersion and hydration studies of maltitol‐water binary mixture using time domain reflectometry 用时域反射法研究麦芽糖醇-水二元混合物的微波介电色散和水化

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2026-05-03 DOI: 10.1007/s12648-026-04049-w

Shilpa S. Patange, Aniket D. Bokhare, Ashok C. Kumbharkhane

{"title":"Microwave dielectric dispersion and hydration studies of maltitol‐water binary mixture using time domain reflectometry","authors":"Shilpa S. Patange, Aniket D. Bokhare, Ashok C. Kumbharkhane","doi":"10.1007/s12648-026-04049-w","DOIUrl":"10.1007/s12648-026-04049-w","url":null,"abstract":"<div>The complex permittivity spectra for the binary system maltitol‐water, within the frequency spectrum of 10 MHz 30 GHz have to been investigated employing the Time Domain Reflectometry (TDR). An analytical approach was undertaken to determine the static dielectric constant (ε0) and relaxation time (τ) corresponding to various volume fractions of water (Vwater) across various temperature conditions. These dielectric parameters were accurately fitted to the Cole–Davidson model to elucidate the relaxation dynamics. The Refractive Indices, Kirkwood Correlation Factor (KCF), Hydration number (Nhyd) and Thermodynamic parameters (∆H and ∆S) have been calculated thereby elucidating the intermolecular interactions present within the binary mixture. The observed increase in the dielectric constant coupled with a reduction in relaxation time, accompanying with an increase in the water content of the solution, suggests that these properties vary with solute concentration and temperature, shaped by the molecular structure of the solute. The empirically obtained static dielectric constants exhibit a strong correlation with the theoretical values, thereby substantiating the validity of the Alenka Luzar hydrogen-bonding model within this framework.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"100 9","pages":"3915 - 3923"},"PeriodicalIF":1.7,"publicationDate":"2026-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Soliton mode-locked erbium-doped fiber laser employing a Zn(II) schiff base complex coated side-polished fiber saturable absorber 采用锌（II）希夫碱络合物包覆侧面抛光光纤饱和吸收器的孤子锁模掺铒光纤激光器

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2026-05-02 DOI: 10.1007/s12648-026-04048-x

Nurul Izzah S. Wadi, Aeriyn D. Ahmad, A. A. Latiff, Ahmad Shuhaimi A. Bakar, Muhammad Ameerullah Sahudin, Khairun Nasriah Azmi, Muhammad Imran M. A. Khudus

{"title":"Soliton mode-locked erbium-doped fiber laser employing a Zn(II) schiff base complex coated side-polished fiber saturable absorber","authors":"Nurul Izzah S. Wadi, Aeriyn D. Ahmad, A. A. Latiff, Ahmad Shuhaimi A. Bakar, Muhammad Ameerullah Sahudin, Khairun Nasriah Azmi, Muhammad Imran M. A. Khudus","doi":"10.1007/s12648-026-04048-x","DOIUrl":"10.1007/s12648-026-04048-x","url":null,"abstract":"<div>We report the first demonstration of a Zn (II) Schiff base complex deposited onto a side-polished fiber (SPF) as a saturable absorber (SA) for soliton mode-locking in an erbium-doped fiber laser (EDFL). The complex was synthesized via a one-pot reflux condensation of 1,2-phenylenediamine and 2,4-dihydroxybenzaldehyde, followed by coordination with zinc (II) acetate, and subsequently dissolved in dimethyl sulfoxide solution. The mixed solution was drop-cast onto the SPF to harness the strong evanescent field interaction, forming an integrated all-fiber SA device. Incorporation of the device into a ring-cavity EDFL enabled stable soliton pulse generation at 1569.03 nm, delivering 1.30 ps pulses at a repetition rate of 1.91 MHz. The laser exhibited a linear increase in output power, pulse energy, and peak power with pump power. At a pump power of 138.68 mW, the pulse energy and peak power reached 1.96 nJ and 1.51 kW, respectively. These results demonstrate that the Zn (II)-complex-coated SPF serves as a novel, practical, and efficient SA for compact and power-scalable ultrafast fiber lasers.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"100 9","pages":"3905 - 3913"},"PeriodicalIF":1.7,"publicationDate":"2026-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Magnetocaloric effect, magnetic properties and compensation behaviors of a ferrimagnetic Ising nanowire with a core–shell structure (1, 3/2): Monte Carlo study 具有核壳结构的铁磁Ising纳米线的磁热效应、磁性能和补偿行为（1,3 /2）：蒙特卡罗研究

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2026-05-02 DOI: 10.1007/s12648-026-04032-5

R. Lahlimi, A. Lahbibi, A. Elidrysy, M. Choubi, S. Harir, Y. Lghazi

引用次数: 0

One-step sol–gel synthesis of Ag–TiO2 nanophotocatalyst for visible LED light-driven methylene blue degradation 一步溶胶-凝胶法制备可见光LED光驱动亚甲基蓝降解用Ag-TiO2纳米光催化剂

IF 1.7 4区物理与天体物理

Indian Journal of Physics Pub Date : 2026-04-30 DOI: 10.1007/s12648-026-04034-3

Agidew Sewnet, Solomon Demiss Negedu, Melese Yalew Ayalew, Esayas Alemayehu

{"title":"One-step sol–gel synthesis of Ag–TiO2 nanophotocatalyst for visible LED light-driven methylene blue degradation","authors":"Agidew Sewnet, Solomon Demiss Negedu, Melese Yalew Ayalew, Esayas Alemayehu","doi":"10.1007/s12648-026-04034-3","DOIUrl":"10.1007/s12648-026-04034-3","url":null,"abstract":"<div>This study explores the structural, morphological, optical, and photocatalytic properties of pure TiO2 and silver-doped TiO2 (Ag–TiO2) nanoparticles synthesized via a simple one-step sol–gel method with Ag concentrations of 1, 3, 5, 7, and 9 mol%. Structural analysis confirmed the formation of a pure anatase phase in all prepared TiO2 samples, with crystallite sizes decreasing from 9.46 to 6.82 nm upon Ag incorporation. FE-SEM and HR-TEM images revealed uniformly distributed nanosized Ag particles on the TiO2 surface, whereas the SAED patterns indicated a polycrystalline nature. Optical studies showed a redshift in the absorption edge and band gap narrowing from 3.10 to 2.91 eV, which was attributed to localized surface plasmon resonance (LSPR) effects. The photoluminescence (PL) intensity decreased with increasing Ag content, suggesting the suppression of the recombination of photogenerated carriers. Photocatalytic experiments using methylene blue (MB) under visible LED irradiation demonstrated that 3 mol% Ag–TiO2 achieved the highest degradation efficiency of 95.7% within 240 min, with an apparent first-order rate constant of 1.37 × 10–2 min−1, representing an approximately 8.5-fold increase over that of pristine TiO2 (1.62 × 10–3 min−1). Radical scavenging- tests identified ·O2− and h+ as the dominant reactive species. The optimized photocatalyst retained over 90% of its activity after five consecutive cycles, confirming its high stability. Overall, Ag doping effectively tailors the physicochemical and catalytic properties of TiO2, yielding a robust and sustainable photocatalyst for visible-light-driven-environmental remediation.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"100 8","pages":"3273 - 3284"},"PeriodicalIF":1.7,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148433998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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