equivalent circuit analysis
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2022 ◽  
Author(s):  
Yanming Feng ◽  
Zhiguo Li ◽  
Qiang Zhao ◽  
P P Chen ◽  
Jiqing Wang

Abstract Fano resonance and plasma induced transparency (PIT) have been widely observed in various plasmonic nanostructures. Fano resonance takes place in weak coupling regime where coupling constant between two electromagnetic modes is lower than damping constant of system. Hence, extracting coupling and damping coefficients from resonance spectrum is the key to distinguish between Fano resonance and other resonances. In this paper, we propose a simple and realizable coupled LC circuit to analyze Fano resonance and PIT. Weak and strong coupling regime are distinguished by comparing coupling constant with damping constant. Meanwhile, we gain deep insight into Fano resonance and PIT in circuit by analyzing circuit phase and understand their connection with resonance in photonic structure. Furthermore, we extend the equivalent circuit model to the field involved short-range plasmon polarization or multi-orders dark modes. Since there are no specific parameters associated with photonic nanostructure, the proposed equivalent circuit can be used in most plasmonic resonance system as an universal model.


2022 ◽  
Vol 5 (1) ◽  
Author(s):  
Xavier Vendrell ◽  
Julia Ramírez-González ◽  
Zuo-Guang Ye ◽  
Anthony R. West

AbstractRelaxor ferroelectrics exhibit both static and dynamic local structural order which controls their frequency-dependent electrical properties. A combination of advanced scattering and microscopy techniques have been used recently to determine the local structure of relaxors. To complement these, here we show an approach to electrical property measurements which identifies local dipoles whose switching is co-operative, temperature-dependent and responsible for the observed dispersion in dielectric properties. Impedance measurements and equivalent circuit analysis of a canonical relaxor, Pb(Mg1/3Nb2/3)O3 single crystal, over the ranges 180–1050 K and 100 Hz–1 MHz, show that incorporation of a single constant phase element into the equivalent circuit used to fit experimental data is able to account fully for the dispersions that characterise the relaxor response, over this frequency range. This allows parametrisation of the relaxor behaviour, gives increased understanding of the relaxation mechanisms responsible and forms the basis for modifying and controlling relaxor characteristics.


2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Zahilia Cabán Huertas ◽  
Daniel Settipani ◽  
Cristina Flox ◽  
Joan Ramon Morante ◽  
Tanja Kallio ◽  
...  

AbstractThis paper presents the electrochemical performance and characterization of nano Si electrodes coated with titanicone (TiGL) as an anode for Li ion batteries (LIBs). Atomic layer deposition (ALD) of the metal combined with the molecular layer deposition (MLD) of the organic precursor is used to prepare coated electrodes at different temperatures with improved performance compared to the uncoated Si electrode. Coated electrodes prepared at 150 °C deliver the highest capacity and best current response of 1800 mAh g−1 at 0.1 C and 150 mAh g−1 at 20 C. This represented a substantial improvement compared to the Si baseline which delivers a capacity of 1100 mAh g−1 at 0.1 C but fails to deliver capacity at 20 C. Moreover, the optimized coated electrode shows an outstanding capacity of 1200 mAh g−1 at 1 C for 350 cycles with a capacity retention of 93%. The improved discharge capacity, electrode efficiencies, rate capability and electrochemical stability for the Si-based electrode presented in this manuscript are directly correlated to the optimized TiGL coating layer deposited by the ALD/MLD processes, which enhances lithium kinetics and electronic conductivity as demonstrated by equivalent circuit analysis of low frequency impedance data and conductivity measurements. The coating strategy also stabilizes SEI film formation with better Coulombic efficiencies (CE) and improves long cycling stability by reducing capacity lost.


Author(s):  
Siti Nur Adlina Norazman ◽  
Mohd Sobri Idris ◽  
Rozana Aina Maulat Osman ◽  
Ku Noor Dhaniah Ku Muhsen

2021 ◽  
Author(s):  
Zahilia Cabán Huertas ◽  
Daniel Settipani Ramirez ◽  
Cristina Flox ◽  
Joan Ramon Morante ◽  
Tanja Kallio ◽  
...  

Abstract This paper presents the electrochemical performance and characterization of nano Si electrodes coated with titanicone (TiGL) as an anode for Li-ion batteries. Atomic Layer Deposition (ALD) of the metal combined with the Molecular Layer Deposition (MLD) of the organic precursor is used to prepare coated electrodes at different temperatures with improved performance compared to the uncoated Si electrode. Coated electrodes prepared at 150° C delivers the highest capacity and best current response of 1800-1 mAhg-1 at 0.1 C and 150 mAhg-1 at 20 C. This represented a substantial improvement compared to the Si baseline which delivers a capacity of 1100 mAhg-1 at 0.1C but fails to deliver capacity at 20C. Moreover, the optimized coated electrode shows an outstanding capacity of 1200-1 at 1C for 350 cycles with a capacity decay of 93%. The improved discharge capacity, electrode efficiencies, rate capability and electrochemical stability for the Si-based electrode presented in this manuscript are directly correlated to the optimized TiGL coating layer deposited by the ALD/MLD processes, which enhances lithium kinetics as demonstrated by equivalent circuit analysis and low frequency data fitting. The coating strategy also stabilizes SEI film formation with better Coulombic efficiencies and improves long cycling stability by reducing capacity lost.


Electronics ◽  
2021 ◽  
Vol 10 (15) ◽  
pp. 1773
Author(s):  
Jie Liu ◽  
Kai Zhang ◽  
Qiang Wu ◽  
Li Peng ◽  
Kai Yao ◽  
...  

In recent years, with the development of the communication industry, the need to use Ethernet switches to transmit big data has become more urgent, and its protocol standards are iterating towards higher return loss, wider bandwidth, lower impedance fluctuations and insertion loss. Based on the research of high-speed backplane with a single channel 25 Gbps transmission rate, a novel double grounded planar strip coplanar waveguide design is presented, which significantly improved return loss to 20 dB and reduced insertion loss, which meet the loss standard of 100GBASE-KR4. The resonant cavity model of transmission line reference plane is improved by introducing vias and the parameters of vias in the reference plane are studied to reduce the impact of resonance, which improved the transmission –1 dB bandwidth to 60 GHz. Based on equivalent circuit analysis of differential vias’ joint reverse pad, the parameters related to the differential vias are studied, the impedance fluctuation is reduced to 100 ± 3 Ω, which is 70% better than the impedance fluctuation standard (100 ± 10 Ω) of 100GBASE-KR4. After optimizing the mathematical model of strip coplanar waveguide, reference plane and differential vias, we built a simulation model of the backplane passive link which met the 100GBASE-KR4 backplane Ethernet specification. In the actual test, it was found that the optimized model can improve the link performance.


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