| terahertz wave owns enormous academic value and application prospect in not onlyBasic research area such as physical, chemical, information and biological but also technical area,material national and defense, medical,for example. Conventional material is difficult to occur inTHz electromagnetic response, in particular magnetic response. SRR structure make up the lack ofelectromagnetic materials in terahertz frequency. SRR structure absorber with the perfectabsorption, regard as an important device in terahertz system, widely used in terahertzcommunication and terahertz detection.In this paper we research on a great quantity of absorbers, Detailed analyze of the absorptionprinciple of four SRR structure absorbers based on the perspective of the circuit, and finishsimulation processing and testing.1.Design two kinds of equivalent circuit models for the split resonance rings absorbers. In firstmodel, The theoretical simulation result of this absorber shows that its center frequency is0.747THz with the absorption gets0.969,reflection reach0.031and the transmission is0. Thetheoretical bandwidth is7GHz. In second model, The theoretical simulation result of this absorbershows that its center frequency is0.735THz, obtained the absorption0.980,reflection reach0.02and transmission is0. The theoretical bandwidth is40GHz Processing and testing this terahertzabsorber, results show that the center frequency is0.734THz obtained the absorption0.990,reflection reach0.05and transmission is0.the bandwidth is50GHz. Compared with the twoequivalent circuit models we found second theoretical models with mutual inductance has higherprecision.2.We research on the squared SRR resonance characteristic and find resonant frequency withthe width between two rings is bigger become higher and with the metal length is longer becomelower. Design an equivalent circuit model The theoretical simulation result of this absorber showsthat its center frequency is0.591THz, obtained the absorption0.984,reflection reach0.016andtransmission is0. The theoretical bandwidth is21GHz Processing and testing this terahertzabsorber, results show that the center frequency is0.572THz obtained the absorption0.993,reflection reach0.07and transmission is0. The bandwidth is25GHz3.Design an equivalent circuit model for the cross terahertz SRR structure absorbers. Thetheoretical simulation result of this absorber shows that its center frequency is0.568THz,obtained the absorption0.993,reflection reach0.007and transmission is0. The theoreticalbandwidth is36GHz Processing and testing this terahertz absorber, results show that the centerfrequency is0.571THz obtained the absorption0.996reflection reach0.04and transmission is 0.The bandwidth is29GHz. we research on resonance characteristic and find resonant frequencywith the length of the cross is longer become higher and with the period is larger become lower.4.We research on The symmetric C shaped SRR structure absorbers，design an equivalentcircuit model. The theoretical simulation result of this absorber shows that its center frequency is0.575THz, obtained the absorption0.995, the reflection reach0.005and transmission is0. Thetheoretical bandwidth is20GHz Processing and testing this terahertz absorber, results show thatthe center frequency is0.571THz obtained the absorption0.996reflection reach0.04andtransmission is0.The bandwidth is24GHz. we research on resonance characteristic and findresonant frequency with the length of the metal longer become lower and with the distancebetween two C shaped is larger become higher. |
