Controlling Electromagnetic Waves In Metal Metamaterials

Metamaterial is the new artificial electromagnetic material whose lattice constantis much smaller than wavelength. The properties of metamaterial are distinguished fromthe other objects in nature. Consequently, it has a broad application foreground, forinstance, supper-resolution imaging, electromagnetic cloaking, absorbers, filters, andsensors. The properties of metamaterial appear at the resonance frequency. And wedesign several structures according to the special electromagnetic phenomenon at theresonance frequency. At last, the results show there are special properties at theresonance frequency, as follows:First, we design an analogue of double electromagnetically induced transparencylike in the middle-infrared region. We discuss the influence of number, position, size ofthe U-shaped ring and the thickness of the substrate by simulation. The structure has theultraslow light by simulation. Afterwards, we expound the broad application foregroundin ultraslow light.Second, we design a sensitive sensor with a micro-structure metamaterial. It isvery sensitive because of the high Q factor at resonance frequency. Consequently, wedesign A sensitive refractive index sensor with a double U-shaped rings-basedmetamaterial.At last, we design the new structure. There is a metamaterial with the hole in themiddle of it. And in the middle of the hole, there is also has a metal rod. Afterwards, wesimulate transmittance as a function of frequency. The curve shows that there are twoenhanced transmission. However, the full widths at half maximum of them vary a lot.The analysis shows that the localized surface resonance and coupled Plasmon cause theenhanced transmission.Then, we make the gain material instead of substrate. And we find the suitablegain material by simulation. Meanwhile, the simulation shows that the gain at differentresonance frequency is different with the same gain coefficient, and the gain withdifferent gain coefficient is different at the same resonance frequency. Meanwhile, theappropriate gain coefficient gains the specific resonance frequency.