Indian Journal of Physics最新文献

{"title":"Design and theoretical study of rectangular photonic crystal fiber based sensor for chemical sensing in terahertz regime","authors":"Deepak Garg, Jyotsna Singh, Ajeet Kumar","doi":"10.1007/s12648-024-03343-9","DOIUrl":"https://doi.org/10.1007/s12648-024-03343-9","url":null,"abstract":"<p>This paper presents the design and theoretical analysis of a photonic crystal fiber (PCF) based chemical sensor model. To evaluate the efficiency of this model, various optical parameters are analysed using finite element method based COMSOL Multiphysics Software. Different analytes namely methanol (1.317), water (1.330), ethanol (1.354) and benzene (1.366) have been considered for the sensing purpose in this study. The core region is infiltrated with different analytes separately. The model is simulated in THz regime (0.5–1.5 THz) to evaluate optical properties. The proposed structure design exhibits a high relative sensitivity of 96.85%, 97.32%, 97.99% and 98.33% for methanol, water, ethanol, and benzene, respectively at an operating frequency of 1.3 THz. The proposed model demonstrates exceptionally low confinement loss values which are 2.22 × 10^–12 dB/m for methanol, 1.16 × 10^–11 dB/m for water, 1.34 × 10^–11 dB/m for ethanol and is 1.30 × 10^–12 dB/m for benzene. Additionally, the effective material loss for the designed PCF also comes out to be very low for all the analytes, 0.0044 cm⁻¹ for methanol, 0.0040 cm⁻¹ water, 0.0034 cm⁻¹ for ethanol and 0.0032 cm⁻¹, for benzene. Furthermore, the PCF shows large effective mode area and numerical aperture (NA) within the mentioned range, at 1.3 THz. The NA values obtained at 1.3 THz are 0.32 for methanol, 0.40 for water, 0.32 for ethanol, and 0.32 for benzene. The obtained Effective mode Area (EMA) values are 1.46 × 10⁵ μm² for methanol, 1.45 × 10⁵ μm² for water, 1.44 × 10⁵ μm² for ethanol and 1.43 × 10⁵ μm², for benzene. Subsequently, the optimal profile provides birefringence values of 0.0009 for methanol, 0.0010 for water, and 0.0011 for both ethanol and benzene. The practical implementation of the proposed PCF structure is possible using subsisting modern fabrication techniques. Consequently, the proposed PCF design should be helpful in industrial areas for chemical research, food and biomedical sensing.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"3 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141776852","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}

{"title":"Wettability measurements of agarose thin films patterned by 193 nm ArF excimer laser","authors":"Q. A. Al-Jarwany, Abdulsattar A. Aesa, A. F. Mohammed, C. D. Walton","doi":"10.1007/s12648-024-03345-7","DOIUrl":"https://doi.org/10.1007/s12648-024-03345-7","url":null,"abstract":"<p>The control and knowledge over liquid–solid interactions is vital for the design optimization of materials, processes in a variety of uses. Thus, investigating wettability plays a great role in such interactions. In this paper, characterisation and the effect of 193 nm excimer laser patterning on the agarose thin films are studied. Different techniques; atomic force microscopy (AFM), scanning electron microscopy and white light interferometer are used to characterise the agarose thin films. UV–Vis spectrophotometer was used to measure the absorption and transmission of thin films. An absorption coefficient and grating period of 1.7 × 10³ cm⁻¹, and 11.5 μm respectively are reported. AFM measurements show the softness of non-irradiated thin films. The obtained results show that the agarose films' surface properties are considerably changed by the laser-induced structuring. Higher contact angles indicate an important reduction in wettability being a consequence of the laser grating's enhanced surface roughness. Measured contact angles and free surface energy of patterning thin film show alterations in surface wettability.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"55 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141776853","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}

{"title":"Active polarization controlling in optical fiber links using optimization algorithms","authors":"Hamid Asgari, Majid Khodabandeh, Soheil Hajibaba, Amir Hosein Dadahkhani, Seyed Ahmad Madani","doi":"10.1007/s12648-024-03342-w","DOIUrl":"https://doi.org/10.1007/s12648-024-03342-w","url":null,"abstract":"<p>Maintaining the state of polarization of a light beam in optical fiber links is a necessity for various applications. It is especially important for optical communication, polarization-based quantum key distribution, etc. There are several ways to compensate for polarization fluctuations, hence lowering the polarization drift error. In this paper, we have experimentally investigated the performance of two optimization algorithms for polarization compensation. We employed these algorithms to control an electrical polarization controller. Our results show that the particle swarm optimization and simulated annealing algorithms can efficiently compensate for polarization fluctuations and drifts. Thus, it is suitable for optical communication and quantum key distribution experiments.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"38 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141776855","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}

{"title":"The control of the symmetry of quantum beam splitting in the hybrid nanosystem","authors":"Su-Ryon Ri, Myong-Chol Ko, Nam-Chol Kim, Ju-Song Ryom, Chol-Min Kim","doi":"10.1007/s12648-024-03319-9","DOIUrl":"https://doi.org/10.1007/s12648-024-03319-9","url":null,"abstract":"<p>The quantum beam splitter plays the important role in the quantum information processing as the key element that control the quantum signals. We propose a theoretical model for the single photon quantum beam splitter that includes two plasmonic waveguides and 3 quantum dots (QDs). The waveguides are configured to form T-shape and the QDs are placed along the horizontal waveguide with separation. Here we considered the dipole–dipole interaction (DDI) between the adjacent QDs. We investigated the quantum beam splitting properties of this system using the real space approach. The result shows that with this system we can realize the symmetric or asymmetric beam splitting by adjusting the waveguide-QD coupling and the DDI strengths between the QDs. This system is a multi-channel quantum router, which can be used widely in the quantum networking.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"48 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141776854","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}

{"title":"Polypyrrole doped zirconium dioxide composite as electrode material for super-capacitor applications","authors":"Feng Zhao, M. Irfan, Waseem Abbas, Gideon F. B. Solre, Bandar Ali Al-Asbahi, Saif M. H. Qaid","doi":"10.1007/s12648-024-03355-5","DOIUrl":"https://doi.org/10.1007/s12648-024-03355-5","url":null,"abstract":"<p>A PPy-ZrO₂ composite was synthesized using in-situ polymerization, resulting in polypyrrole-doped Zirconium dioxide. This composite was then studied for its electrochemical characteristics as an electrode material in supercapacitors. The X-ray diffraction (XRD) study confirmed the formation of the composite. Scanning Electron Microscopy (SEM) also confirms platelet structure in the PPy-ZrO₂ composite. Fourier transform infrared (FTIR) analysis showed strong interaction between PPy and ZrO₂ nanoparticles. Synthesized samples are characterized and assessed by impedance, cyclic voltammogram, and galvanostatic charge/discharge. The maximum specific capacitance of 1265 Fg⁻¹ at 1 Ag⁻¹ is observed at PPy-ZrO₂ electrodes. The energy density of 28 Wh kg⁻¹ is found at 378 W kg⁻¹ (power density), and the impedance of pure PPy ~ 13 Ω to PPy-ZrO₂ ~ 11 Ω of the composite is decreased, which may represent a beneficial effect of ZrO₂-particles and PPy for the development of an electrode material.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"16 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141776776","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}

{"title":"Ultrasonic Grüneisen parameters of plutonium monopnictides","authors":"Amit Kumar, Shakti Pratap Singh, Anurag Singh, Devraj Singh, Ram Krishna Thakur, Ajit Kumar Maddheshiya","doi":"10.1007/s12648-024-03334-w","DOIUrl":"https://doi.org/10.1007/s12648-024-03334-w","url":null,"abstract":"<p>The Born–Mayer and Coulomb potential has been utilized to figure out higher order elastic constants for the plutonium monopnictides PuPn (Pn: N, P, As, Sb, Bi) in the temperature interval 100–500 K. The mechanical constants have been calculated using the Voigt–Reuss–Hill (VRH) approximation at room temperature using the second order elastic constants. The Born stability conditions have been found out for finding the nature and strength of PuPn. The first order pressure derivatives of second order elastic constants and mechanical properties have been computed with the help of second- and third-order elastic constants in the temperature interval 100–500 K. The second order elastic constant and density has been used to obtain the ultrasonic velocities for longitudinal and shear modes of propagation and the Debye average velocity along &lt; 100 &gt; , &lt; 110 &gt; and &lt; 111 &gt; directions in the temperature span 100–500 K. Finally, the ultrasonic Grüneisen parameters of PuPn have been enumerated along &lt; 100 &gt; , &lt; 110 &gt; and &lt; 111 &gt; directions at room temperature. Evaluated results have been discussed and correlated with applicable data of similar type materials.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"22 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738875","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}

{"title":"Bird nest-like shape of polypyrrole-iodide/iodine complex nanocomposite with highly optical and morphological behavior for green hydrogen generation","authors":"Mohamed Rabia, Eman Aldosari, Mahmoud Moussa","doi":"10.1007/s12648-024-03353-7","DOIUrl":"https://doi.org/10.1007/s12648-024-03353-7","url":null,"abstract":"<p>A novel bird nest-like structured complex nanocomposite, known as polypyrrole-iodide/iodine (Ppy-I/I₂), has been successfully synthesized using a one-pot oxidation reaction involving pyrrole and iodine materials. This complex nanocomposite exhibits highly promising characteristics both in terms of morphology and optics properties. The distinctive morphological features of the Ppy-I/I₂ complex nanocomposite are particularly noteworthy. Its bird nest-like structure consists of particles with well-defined cavities inside and small particles adorning the exterior surfaces. The distinctive morphology significantly improves the active sites and acts as an efficient photon trap, enhancing its exceptional optical properties. The bandgap of this composite measures 2.45 eV, which is a significant advantage for a polymer-based complex composite. This bandgap value makes it particularly applicable, especially in the realm of optoelectronics and photoelectrochemical processes. One of the standout applications for this complex nanocomposite is its use as a photocathode for the H₂ generation using the Red Sea water. Under various light conditions: white light and specific photon wavelengths, the photocathode demonstrates its efficiency. The current density (J_ph) values obtained are highly indicative of its performance, reaches − 0.8 mA cm⁻² under white light. Moreover, at temperatures 30–50 °C, the J_ph values show a notable improvement, rising from − 0.8 to − 0.89 mA cm⁻², which highlights the photocathode's versatility and potential for enhanced hydrogen generation.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"7 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738882","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}

{"title":"In-depth dielectric study of bulk nanocrystalline β-H2Pc with different biasing and photovoltaic performance of β-H2Pc/p-Si solar cell under varied illumination","authors":"A. A. El-Saady, A. A. M. Farag, N. Roushdy, Dalia M. Abdel Basset, M. M. El-Nahass","doi":"10.1007/s12648-024-03267-4","DOIUrl":"https://doi.org/10.1007/s12648-024-03267-4","url":null,"abstract":"<p>This study offers a comprehensive analysis of the thermal stability of β-metal-free phthalocyanine (β-H₂Pc) powder, demonstrating its resilience at temperatures of approximately 470°C. The nanocrystalline nature of β-H₂Pc was confirmed using scanning electron microscopy, particle size analysis, and atomic force microscopy. Furthermore, an extensive exploration of the dielectric properties of bulk β-H₂Pc, in the form of compacted pellets, was undertaken over a wide frequency range (10 Hz–20 MHz) at different temperatures (303, 348, and 423 K), with consideration of the impact of DC-bias voltages (− 2 V to 2 V). Interestingly, the examined dielectric characteristics exhibited a substantial dependency on bias voltage, frequency, and temperature. The series resistance diminishes with increasing temperature, indicating enhanced device performance under elevated thermal conditions. In addition, this study delved into the photovoltaic characteristics of the β-H₂Pc/p-Si diode under various illumination levels and was used to evaluate its potential for optoelectronic applications. The observed current density–voltage behavior demonstrates diode-like properties, with the generated current showing evidence of thermal activation. Furthermore, the Fill Factor decreased with increasing illumination intensity and power.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"40 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738878","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}

{"title":"Exploring electronic, structural, optical, and elastic properties of MgX2O6 (x = Ta, Nb) compounds for photovoltaic and optoelectronic applications: first study effort","authors":"Murat Aycibin,&nbsp;Mustafa Çelebi,&nbsp;Mehmet Erzen,&nbsp;Harun Akkuş","doi":"10.1007/s12648-024-03147-x","DOIUrl":"10.1007/s12648-024-03147-x","url":null,"abstract":"<div><p>In this study, the structural, optical, and elastic properties of tetragonal MgTa₂O₆ and orthorhombic MgNb₂O₆ were determined using the Wien2k and ABINIT computational programs with the aid of density functional theory. The results imply that both compounds are classified as wide band gap semiconductor with 4.143 eV (for MgTa₂O₆) and 3.653 eV (for MgNb₂O₆) with PBEsol-GGA + TB-mBJ approximation. The findings of bulk modulus, shear modulus, Young modulus, Poisson’s ratio, and anisotropy factors were determined and discussed in detail. The ductile behavior and the mechanism of structural stability were also explained.</p></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"98 10","pages":"3571 - 3582"},"PeriodicalIF":1.6,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12648-024-03147-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and characterization of structural, electrical, magnetic and microwave properties of Ba0.5Sr0.5Fe12O19-polyaniline nanocomposites","authors":"Tavus Hosseinabad, Gholamreza Nabiyouni, Kambiz Hedayati","doi":"10.1007/s12648-024-03336-8","DOIUrl":"https://doi.org/10.1007/s12648-024-03336-8","url":null,"abstract":"<p>In this article, barium strontium hexaferrite was synthesized using the surfactant-free ultrasonic method. Then Ba_0.5Sr_0.5Fe₁₂O₁₉/polyaniline nanocomposites were made in the form of thick layer, thin film and nanofibers. The bulk layer forges via the in-situ synthesis method, and the thin film is synthesized by electrodeposition in cyclovoltammetry mode. The nanofibers were manufactured using the electrospinning method. The products were investigated via X-ray diffractometer, field emission scanning electron microscope, transmission electron microscope, and vibration sample magnetometer. The band gap, exciton binding energy, and the Urbach energy of Ba_0.5Sr_0.5Fe₁₂O₁₉ nanoparticles were calculated by optical and electrical methods. The reflection loss of nanocomposites at frequencies between 2 and 18 GHz was measured by Vector Network Analyzer. The magnetic properties of nanoparticles were weakened by their presence in the polymer matrix. The DC conductivity of polyaniline decreased by adding ferrite nanoparticles to it and reached from 0.67 S.cm⁻¹ in pure polyaniline to 2.5 × 10^–5 S.cm⁻¹ in composite nanofibers. The highest value of reflection loss (RL_min) − 16.99 dB at the frequency (f_min) of 11.2 GHz was obtained for the thick layer nanocomposite.</p>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"30 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738879","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}