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On the basis of transformation thermodynamics and compensation medium theory, we develop a method to design a two-dimensional thermal illusion device with arbitrary shape, and the general expression of thermal conductivity in the each region is obtained. Simulation results show that when an object is covered with the thermal illusion device, it will accurately perform the same temperature distribution signature as another object we have predetermined. Owing to the property of deceiving and interfering with the observer, the thermal illusion device can achieve generalized thermal stealth by using thermal metamaterials, which may have a potential application in military field. 相似文献
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A 7-chip, 280 Gb/s optical code-division multiplexing (OCDM) system incorporating quaternary phase coding and decoding superstructured fiber Bragg gratings (SSFBGs) is experimentally demonstrated. Only ordinary phase masks and sub-micrometer precision are needed to fabricate the encoding and decoding SSFBGs. Interchannel interference noise is also considered and evaluated, 2-channel 40 (Gb/s)/channel (2×40 Gb/s) signal transmission is demonstrated. 相似文献
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研究了皮秒抽运脉冲在正常色散平坦光纤中超连续谱的形成过程,分析了脉冲演化过程中光波分裂的产生及其所显示的四波混频对超连续谱特性的影响.结果表明:脉冲初期光谱展宽由自相位调制效应主导,此后由于光谱中心区域能量在色散作用下不断向旁瓣转移,自相位调制效应逐渐减弱而四波混频作用增强,光谱会再度显著展宽.超连续谱的噪声特性与光谱演化状态密切相关,是光谱特征结构对抽运脉冲强度噪声响应的动态表征.
关键词:
正常色散平坦光纤
自相位调制
四波混频
超连续谱 相似文献
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