Predicting Multi-Order Magnetic Polaritons Resonance in SiC Slit Arrays by Mutual Inductor–Inductor–Capacitor Circuit Model

2020 ◽  
Vol 142 (7) ◽  
Author(s):  
Yanming Guo ◽  
Bo Xiong ◽  
Yong Shuai
Keyword(s):  
Electromagnetic Field ◽  
Electromagnetic Waves ◽  
Fdtd Method ◽  
Circuit Model ◽  
Radiative Properties ◽  
Field Calculation ◽  
Thermal Radiative Properties ◽  
Resonance Frequencies ◽  
Lc Circuit ◽  
Calculation Results

Abstract Magnetic polariton (MP) that couples electromagnetic waves with magnetic excitation can be predicted by equivalent inductor–capacitor (LC) circuit model. However, when the resonance frequencies of MP and surface phonon polariton (SPhP) is close, the absorption and transmission peaks predicted by LC circuit model are far different from solving electromagnetic field calculation results. In this work, absorption and transmission enhancements with a SiC slit array are theoretically demonstrated within the SiC phonon absorption band with finite difference time-domain (FDTD) method. The interactions between SPhP and MP are confirmed by electromagnetic field distributions. Mutual inductor–inductor–capacitor (MLC) circuit model is used to predict the multiorder MP resonance conditions, and the coupling between MP and SPhP is treated as a mutual inductor in MLC model. The geometric effects of SiC slit arrays are investigated and MLC circuit model works well. This study may contribute to the design and prediction of thermal radiative properties and micro-/nanostructure metamaterials thermal radiative properties database building.

Predicting Multi-Order Magnetic Polaritons Resonance in SiC Slit Arrays by Improved LC Circuit Model

2019 ◽  
Author(s):  
Yanming Guo ◽  
Yong Shuai
Keyword(s):  
Electromagnetic Field ◽  
Resonance Condition ◽  
Fdtd Method ◽  
Circuit Model ◽  
Radiative Properties ◽  
Absorption Enhancement ◽  
Field Calculation ◽  
Thermal Radiative Properties ◽  
Resonance Frequencies ◽  
Lc Circuit

Abstract Magnetic polariton (MP) that couples electromagnetic waves with magnetic excitation can be predicted by equivalent inductor-capacitor (LC) circuit model. However, when the resonance frequencies of MP and surface phonon polariton (SPhP) is close, the absorption peak predicted by the previous LC circuit model are far different from solving electromagnetic field calculation results. Absorption enhancement with a SiC slit array is theoretically demonstrated within the SiC phonon absorption band with Finite-difference time-domain (FDTD) method. The electromagnetic field distributions confirm the interactions between SPhP and MP. Taking the effects of interactions between MP and SPhP into account, the improved LC circuit model is employed to predict MP1 resonance condition and the method for predicting the multi-order MP resonance conditions is given. This study may contribute to the oriented design of thermal radiative properties and micro/nanostructures metamaterials thermal radiative properties database building.

Parametric Investigation and Analysis of an Electric-LC Resonator by Using LC Circuit Model

2020 ◽  
Vol 35 (10) ◽  
pp. 1113-1118
Author(s):  
Han Xiong ◽  
Xiu-Ming Li
Keyword(s):  
Theoretical Calculations ◽  
Normal Incidence ◽  
Circuit Model ◽  
Critical Parameters ◽  
Left Hand ◽  
Resonance Frequencies ◽  
Lc Circuit ◽  
Lc Resonator ◽  
Specific Frequency ◽  
Lc Resonators

Electric-LC resonators (ELCs) metamaterials, as a kind of common structures, have been extensively investigated from microwave to terahertz frequencies. In this paper, we present a LC circuit model to analyze electric-LC resonator. With the reliable and closed formulas of the effective inductance and capacitance, the expressions of electric and magnetic resonance frequencies were obtained, which is suitable to discuss the resonance characteristic under the normal incidence case. Meanwhile, the mutual relationships among the permittivity, permeability, refractive index, and structure parameters can be explored by using the obtained expressions. Numerical simulations and theoretical calculations reveal that the width and length of the gaps are some of the critical parameters determining the resonator frequency of the example metamaterial. This study provides valuable information for designing the desired left-hand metamaterial at some specific frequency points.

Numerical Simulation of Solidification Process for a Machine Tool Bed

2011 ◽  
Vol 675-677 ◽  
pp. 987-990
Author(s):  
Ling Tang ◽  
Xu Dong Wang ◽  
Hai Jing Zhao ◽  
Man Yao
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Temperature Distribution ◽  
Machine Tool ◽  
Computation Time ◽  
Solidification Process ◽  
Field Calculation ◽  
Original Design ◽  
Calculation Results ◽  
Improved Design

In this paper, the flow, heat transfer and stress during solidification process of the machine tool bed weighed about 2.5ton that has been optimized by structural topologymethod, was calculated with ProCAST software, and the causes of the crack forming in the casting of the machine tool bed was analysed. According to the calculation results, the structural design of the local part where cracks tends to form has been improved, and the heat transfer and the stress are calculated again. By comparing the temperature field with filling of molten cast iron and without filling, it has been found that there was little effect of filling on the results of temperature distribution of the cast, therefore the effect of filling can be ignored in the following temperature field calculation to save computation time. The model has been simplified in the stress field calculation with considering the complexity of the machine tool bed and the cost of computation. Then, the merits and demerits of the original design and the improved design are compared and analyzed depending on the calculated temperature and stress results. It is suggested that the improved one could get a more uniform temperature distribution and then the trend of the crack occurring can be greatly reduced. These results could provide a guide for the actual casting production, achieving the scientific control of the production of castings, ensuring the quality of the castings.

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