Article
Engineering, Electrical & Electronic
Deviprasad Sahoo, Satyaprakash Sahoo, Devarajan Alagarasan, Rajamanickam Ganesan, Selvaraj Varadharajaperumal, Ramakanta Naik
Summary: This study investigates the impact of proton irradiation on the structural, optical, and morphological properties of thermally evaporated As40Se50Sb10 thin films. The results show that proton irradiation leads to changes in absorption edge, optical band gap, and nonlinear optical parameters, demonstrating the tuning capabilities of the films. X-ray diffraction indicates the amorphous nature of the films post-irradiation, and microstructural changes are observed from Raman spectra. The higher values of nonlinear optical parameters with proton irradiation are crucial for advanced photonic applications.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Optics
Ziheng Zhou, Hao Li, Wangyu Sun, Yijing He, Inigo Liberal, Nader Engheta, Zhenghe Feng, Yue Li
Summary: In this work, the researchers demonstrate the comb-like dispersion of effective permeability in an Epsilon-near-zero (ENZ) medium comprising multiple dielectric photonic dopants. They also show that resonant supercouplings can be controlled via the assignment of dopants. The concept of dispersion coding is proposed, where photonic dopants serve as bits to program the spectral response of the whole composite medium. A compact multi-doped ENZ cavity is fabricated and experimentally characterized as proof of concept, showing potential for applications including dynamically tunable comb-like dispersion profiled filters and radio-frequency identification tags.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Green & Sustainable Science & Technology
Sami Ullah, Mohamad Azmi Bustam, Muhammad Sagir, Mohammed Ali Assiri, Abdullah G. Al-Sehemi, Muhammad Ayoub, Abrar Inayat, Ahmad Mukhtar, Sidra Saqib, Muhammad Babar, Khurram Shehzad Qureshi, Su Shiung Lam
Summary: Population rise and economic development lead to increased energy utilization, mainly based on fossil fuel combustion and industrial operations in the oil and gas industry, resulting in CO2 emissions. Piperazine/diethanolamine solvent mixtures were examined as substitutes for improved CO2 absorption from natural gas. The experimental results showed that aqueous PZ could increase the solubility of CO2 and has the potential to be an ideal mixture for CO2 absorption. Additionally, the study found that increasing temperature leads to a decrease in the thermophysical properties of the mixtures.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Chemistry, Physical
A. Khalid, R. M. Ahmed, Mohamed Taha, T. S. Soliman
Summary: Magnetic iron oxide (Fe3O4) and Fe3O4 @SiO2 core-shell nanoparticles were prepared and their optical properties were studied. Three different methods were used to determine the optical gap energy of the nanoparticles, and it was found that Fe3O4 @SiO2 NPs have higher gap energy values compared to Fe3O4 NPs and SiO2 NPs. The Fe3O4 @SiO2 NPs also exhibited high values of optical oscillator strength and third-order nonlinear optical susceptibility, making them suitable for applications in nonlinear optics. The synthesized Fe3O4 @SiO2 core-shell nanomaterials with enhanced optical parameters are considered as promising candidates for nonlinear optical applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Optics
Zhifeng Li, Hai Lin, Rui Zhou, Xintong Shi, Zihao Yu, Y. Liu, Jian Wu, Rongxin Tang
Summary: This paper investigates the excitation of toroidal dipole mode through the design of the unit cell in a photonic crystal to suppress radiative losses of other multipoles. The photonic crystals with Dirac-like dispersion at the G point can be mapped to a zero-index medium. The proposed photonic crystal slab has low-loss and easy integration properties.
Article
Optics
Ivan S. Panyaev, Dmitry G. Sannikov, Nataliya N. Dadoenkova, Yuliya S. Dadoenkova
Summary: The study investigates the spectral properties and electromagnetic wave transmission of one-dimensional three-periodic photonic crystals composed of various dielectric oxides. It reveals a larger angular distance between transmission peaks compared to ternary photonic crystals, which is significant for designing highly efficient optical devices operating in the infrared regime.
Article
Physics, Applied
Cai-Xing Hu, Si-Jia Guo, Hai-Feng Zhang
Summary: In this study, a RI sensor with superconducting photonic crystal in the terahertz regime was theoretically analyzed by the transfer matrix method, presenting an asymmetric resonance cavity and coupled wave theoretical model for optimization. The proposed sensing models achieve excellent performance over 80K, with sensitivity and figure of merit reaching high values at ultra-low temperatures. The performance indicators of the optimized model are dozens of times those of traditional photonic crystal RI sensors, providing theoretical guidance for the design of high-performance low-temperature RI sensors.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Optics
Fujun Sun, Yan Yang, Zhihua Li, Daquan Yang, Huiping Tian, Chengkuo Lee
Summary: We present the characteristics of disturbed spatial modes in a multi-mode photonic crystal nanobeam cavity (PCNC) in the mid-infrared wavelength range through numerical and experimental methods. The resonance wavelength of the spatial modes can be controlled by modifying the size, period, and position of the central periodical mirrors in PCNC, leading to better utilization of the spectrum resource. Moreover, we investigate the side coupling characteristics of PCNC supporting both air and dielectric modes for the first time. This work serves as a proof of design method for flexible control of spatial modes in PCNC, enabling the realization of integrated multi-function devices in a limited spectrum range.
Article
Chemistry, Physical
Abinash Parida, D. Sahoo, D. Alagarasan, S. Vardhrajperumal, R. Ganesan, R. Naik
Summary: The current paper reports the thermal annealing induced amorphous to crystalline transformation of the quaternary In15Sb10S15Se60 thin films. The structural and optical properties of the films were characterized, and it was found that annealing resulted in the decrease of optical bandgap and increase in linear refractive index. The changes in the linear and nonlinear optical parameters make the In15Sb10S15Se60 thin films suitable for various photonic and optoelectronic applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
S. J. Burns
Summary: The thermodynamics of linear dielectric are formally developed to explore the isothermal and adiabatic temperature-pressure dependence of dielectric constants. The argument for the dielectric constant's isentropic temperature dependence is thermodynamic and applicable to all physical models. The isentropic slope of the displacement field vs the electric field shows instability at high temperatures due to changes in the curvature of the temperature dependence of the dielectric constant, impacting the electronic entropy contribution.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Engineering, Electrical & Electronic
A. Ben Ahmed, N. Bouchikhi, M. Benhaliliba
Summary: The thermal stability, vibrational spectroscopy, electric response, linear and nonlinear optical properties, and optical properties of pure PVP polymer for solar cell device are studied. The optimized geometry of the structural unit and oligomer of PVP polymer is shown. The absorption peaks in IR and Raman spectra are analyzed. The net atomic charges of PVP are obtained via Mulliken population analysis, and the electrostatic potential with respect to the surface at constant electron density is depicted. The optical absorbance spectrum of pure PVP is illustrated, and the absorption spectrum and optical gap of PVP polymer are determined. The DOS spectrum and the distributions of the HOMO and LUMO orbitals are represented. The effect of light on current-voltage measurement is demonstrated by recording an open circuit voltage of 0.25 V and a short circuit current of 3.9 μA at 150 W/cm(2).
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Energy & Fuels
Mumtaz Manzoor, Muhammad Waqas Iqbal, Ramesh Sharma, Jisha Annie Abraham
Summary: Structural, optoelectronic, elastic, transport, and thermodynamic properties of lead-free perovskite compounds XInO3 (X = As, Sb) were investigated using first-principles calculation. The results showed that these materials have semiconductor properties, good optical performance, and elastic properties, making them suitable for applications such as solar energy harvesting.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Optics
Yi Zihan, Lecler Sylvain
Summary: A photonic nanojet is a highly localized electromagnetic propagative beam in the shadow side of a dielectric micro-particle, which has inspired numerous original developments worldwide.
Article
Physics, Multidisciplinary
H. S. Wasly, M. S. Abd El-Sadek, Sahar Elnobi, Amr Attia Abuelwafa
Summary: This study focuses on the deposition and characterization of SnO thin film on a PET substrate. The results show that the SnO/PET film has a large p-type carrier mobility and high nonlinear optical parameters, indicating its potential for flexible optoelectronic devices.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Optics
Abrar Islam, Firoz Haider, Rifat Ahmmed Aoni, Rajib Ahmed
Summary: A photonic crystal fiber-based surface plasmon resonance sensor for rapid detection and quantification of novel coronavirus has been successfully developed and investigated numerically. The proposed sensor demonstrates viable detections of different components of the virus and shows promising sensitivity and resolution for viral RNA detection. The compact photonic sensor is well-suited for rapid point-of-care COVID testing.
Article
Polymer Science
Marius Ousmanou Bouba, Fridolin Tchangnwa Nya, Alhadji Malloum, Jeanet Conradie, Jean Marie Ndjaka
Summary: This study investigated the structures, electronic properties, and mobilities of perfluorinated, perchlorinated, and percyanated coronene molecules using density functional theory and Time Dependent DFT. The results suggest that percyanation significantly improves the optoelectronic properties of coronene, making it a promising candidate for air-stable organic materials in electronics.
Article
Energy & Fuels
Guy Maurel Dzifack Kenfack, Fridolin Tchangnwa Nya, Amel Laref
Summary: This study investigates the effects of various material physics elements on the output characteristics of a lead-free perovskite solar device in order to improve its performance. Through calculations and modeling, the study identifies the parameters that significantly affect the characteristics of the cell. Promising PV performances are obtained by considering factors such as doping concentration, thicknesses, and temperature.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Biochemical Research Methods
Crevain Souop Tala Foadin, Fridolin Tchangnwa Nya, Alhadji Malloum, Jeanet Conradie
Summary: The absorption capacity, optoelectronic, and non-linear optical properties of graphene oxide nanosheet (GON) and its doped derivatives with aluminum (-Al) atoms were studied using density functional theory (DFT). The research proposed various molecular design schemes based on push-pull models of GON to enhance NLO properties and decrease the band gap value.
JOURNAL OF MOLECULAR GRAPHICS & MODELLING
(2022)
Article
Materials Science, Multidisciplinary
P. Noudem, D. Fouejio, C. D. D. Mveme, S. S. Zekeng, F. Tchangnwa Nya, G. W. Ejuh
Summary: This study investigates the properties of two styrylquinoline monomers using HF and DFT methods. The results show that they have good optoelectronic properties, thermodynamic stability, and nonlinear optical properties. These materials can be applied in solar cells and optical communication.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Energy & Fuels
Francis Tchomb Mabvuer, Fridolin Tchangnwa Nya, Guy Maurel Dzifack Kenfack
Summary: This paper investigates the use of a stepped band gap profile to improve the performance of thin films CIGS-based solar cells, and finds it to be a promising approach for engineering high-efficiency solar cells.
Article
Chemistry, Multidisciplinary
R. Al-Amer, W. Khan, A. Laref, H. R. AlQahtani, G. Murtaza, Q. Mahmood, Fridolin Tchangnwa Nya, Shahariar Chowdhury, Mohammed El Amine Monir, Eman A. Alghamdi, H. M. Huang, Y. C. Xiong, J. T. Yang
Summary: In this study, the effects of compositional doping of Hf on the physical characteristics of the SrFBiS2 compound were investigated. It was found that Hf doping leads to a metallic character and the emergence of a viable superconducting state. The band structures and Fermi surface topologies vary significantly with the concentration of Hf, and optical anisotropy decreases with Hf doping.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Polymer Science
Emmanuella Claudia Yibain Khokho, Fridolin Tchangnwa Nya, Alhadji Malloum, Jeanet Conradie
Summary: In this study, the electronic, optoelectronic, optical, and thermodynamic properties of the parent molecules and their derivatives formed by functionalization with chlorine and potassium atoms were investigated. The results showed that the molecules functionalized with potassium atoms had small gap energy values, making them suitable for applications in electronics. These molecules also exhibited non-centrosymmetric architecture and high performance in nonlinear optics. Therefore, the functionalized potassium molecules have potential applications in optoelectronics and photonics.
Article
Biochemistry & Molecular Biology
Guy Maurel Dzifack Kenfack, Fridolin Tchangnwa Nya, Marius Ousmanou Bouba, Alhadji Malloum, Jeanet Conradie
Summary: The optoelectrical, electronic, and thermodynamic properties of {6}cycloparaphenylene ({6}CPP) and its derivative, N,N-dimethyl-diaza{6}cycloparaphenylene (DMDA{6}CPP), were investigated in this study. The results showed that DMDA{6}CPP exhibited good characteristics as an absorber material in organic solar cell devices, with a light-harvesting efficiency of 25%. It also demonstrated good hole transport abilities and excellent linear and nonlinear optical properties, positioning it as a perfect candidate for NLO applications and optoelectronics.
JOURNAL OF MOLECULAR MODELING
(2023)
Article
Materials Science, Multidisciplinary
Guy Maurel Dzifack Kenfack, Fridolin Tchangnwa Nya, Amel Laref
Summary: This study proposes a novel lead-free perovskite solar cell (PSC) design incorporating carbon nanotubes (CNTs) and cuprous oxide (Cu2O) to address the current challenges of cost-effectiveness, eco-friendliness, long-term stability, and efficiency. Numerical simulations were conducted using SCAPS software to evaluate current-voltage and quantum efficiency characteristics, as well as light trapping mechanisms. The proposed architecture achieved promising results with a Voc of 1.00 V, jsc of 34.65 mA/cm2, FF of 72.80%, and PCE of 25.31%.
Article
Physics, Condensed Matter
A. K. Kushwaha, W. Khan, H. R. AlQahtani, A. Laref, Mohammed El Amine Monir, Fridolin Tchangnwa Nya, Shahariar Chowdhury, Eman A. Alghamdi, H. M. Huang, Y. C. Xiong, J. T. Yang
Summary: First principles modeling is used to analyze the structural and optical properties of intrinsic or doped TiO2 systems, including Fe or Mn single-atom doped and Mn-Fe co-doped anatase TiO2. The results show that the doped materials exhibit magnetic or intermediate band behaviors, and the optical absorption characteristics are shifted towards the visible light regime. This study suggests that the Fe-Mn co-doped anatase TiO2 system could be a promising candidate for applications in photocatalysts or magnetic storage devices.
SOLID STATE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Francis Tchomb Mabvuer, Fridolin Tchangnwa Nya, Guy Maurel Dzifack Kenfack, Amel Laref
Summary: In this research, we investigated the efficiency loss in thin-film CIGS photovoltaic cells due to reduced absorber coat depth, and found that the disruption of charge-carrier transport is the main cause. To improve the efficiency, we proposed an architecture with a stepped band gap profile. By modifying the gallium content, we modeled a three-steps stacking profile of the active layer and achieved an enhancement in efficiency and fill factor values.
Article
Spectroscopy
Z. Hussein, W. Khan, A. Laref, H. R. Alqahtani, Z. I. Y. Booq, R. Alsalamah, A. Ahmed, Fridolin Tchangnwa Nya, Shahariar Chowdhury, Mohammed El Amine Monir, Atul Kumar, H. M. Huang, Y. C. Xiong, J. T. Yang
Summary: 2D graphene doped with Al and Si atoms were studied using ab-initio simulations to investigate their electronic and optical behaviors. Al-doped graphene exhibited p-type behavior, while Si-doped graphene showed semiconducting behavior. Doping two Al atoms created a metallic system, while doping two Si atoms caused the reappearance of the Dirac cone. The different electronic structures of these doped systems resulted in different optical behaviors, altering the optical absorption from the infrared to the visible windows.
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
(2023)
Article
Physics, Multidisciplinary
Barnabas Aloumko, Crevain Souop Tala Foadin, Marius Bouba Ousmanou, Fridolin Tchangnwa Nya, Geh Wilson Ejuh
Summary: The reactivity, electronic, linear and non-linear optical properties of titanium dioxide, boron and nitrogen-doping carbon nanocone were systematically evaluated using density functional theory (DFT) levels B3LYP, B3PW91 and CAM-B3LYP/6-31+G(d). The doping resulted in a significant reduction in the energy gap of the carbon nanocone, making some of the derivatives suitable for semiconductor materials and highly demanded-superconducting materials. The study also identified a derivative with high absorption capacity in the visible range, making it a potential candidate for photovoltaic devices. Additionally, the formed derivatives showed superior properties for non-linear optical applications and predicted exothermic reactions, contrary to previous literature findings. Manipulation of boron and nitrogen heteroatoms offers new opportunities to enhance the properties of carbon nanocones.
Article
Energy & Fuels
Anne Marie Houmomou, Sali Mohammadou, Guy Maurel Dzifack Kenfack, Fridolin Tchangnwa Nya, Amel Laref, Alidou Mohamadou
Summary: This research investigates a method to improve the performance of CIGSe-based thin-film solar cells by analyzing the output parameters of two reference cells with different buffer layers. The use of ZnS as a buffer layer and an indium-enriched layer at the ZnS/CIGSe heterojunction results in improved performance. Numerical modeling software is used to calculate the efficiency, and the ZnS structure achieves an efficiency of 24.31%. Further analysis of functional layer properties leads to an optimized structure, resulting in improved efficiency of 25.22% and a stable flow of charge carriers.
Article
Polymer Science
Barnabas Aloumko, Fridolin Tchangnwa Nya, Crevain Souop Tala Foadin, Marius Bouba Ousmanou, Geh Wilson Ejuh
Summary: This study investigates the electronic, optoelectronic, linear, and nonlinear optical properties of corannulenes doped with boron-nitride units at the rim position. The results show that these doped structures have good energy stability and exhibit semiconducting behavior. Moreover, the addition of boron-nitride units enhances the first-order hyperpolarizability, making them suitable for nonlinear optical applications. Specifically, the compounds C35B5N5H15 and C70B5N5H20 exhibit high photo-current response in the visible range, making them promising materials for optoelectronic applications.
