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arXiv 0810.0592physics.optics
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用纳米腔天线增强光通过金属纳米狭缝的异常传输

Enhancing extraordinary transmission of light through a metallic nano slit with a nano cavity antenna

Yanxia Cui, Sailing He

摘要:

通过在狭缝开口上引入由附近的金属纳米带形成的纳米腔天线,增强了光通过金属膜中的纳米狭缝的非凡传输。对于固定的波长,金属纳米带的宽度应选择为使有限长度的水平金属-绝缘体-金属波导谐振为法布里-珀罗腔。当使用这种腔体天线来增强通过非谐振纳米狭缝的传输时,狭缝应该在水平谐振腔中具有最大磁场的位置处打开。结果表明,优化后的腔体天线可以大大提高光通过非谐振纳米狭缝(约20倍)或谐振纳米狭缝(124%)的传输。纳米狭缝的透射光谱也可以通过调节金属纳米带的宽度来调节。首次研究了纳米腔体天线的这种传输增强效应,并解释了其物理机制。

英文摘要:

The extraordinary transmission of light through a nano slit in a metal film is enhanced by introducing a nano cavity antenna formed by a nearby metallic nano-strip over the slit opening. For a fixed wavelength, the width of the metallic nano-strip should be chosen to make the horizontal metal-insulator-metal waveguide of finite length resonant as a Fabry-Perot cavity. When such a cavity antenna is used to enhance the transmission through a non-resonant nano slit, the slit should be opened at a position with maximal magnetic field in the horizontal resonant cavity. It is shown that an optimized cavity antenna can enhance greatly the transmission of light through a non-resonant nano slit (by about 20 times) or a resonant nano slit (by 124%). The transmission spectrum of the nano slit can also be tuned by adjusting the width of the metallic nano-strip. Such a transmission enhancement with a nano cavity antenna is studied for the first time and the physical mechanism is explained.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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