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arXiv 0904.3484cond-mat.mes-hall
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光学等离子体激元和单等离子体激元源的近场电学探测

Near-field Electrical Detection of Optical Plasmons and Single Plasmon Sources

Abram L. Falk, Frank H. L. Koppens, Chun L. Yu, Kibum Kang, Nathalie de Leon Snapp, Alexey V. Akimov, Moon-Ho Jo, Mikhail D. Lukin, Hongkun Park

摘要:

光子电路可以比电子电路快得多,但它们很难在光波长尺度以下被放大。基于表面等离子体激元(SP)的纳米级光子电路是解决这个问题的一个很有前途的方法,因为它们可以使光在衍射极限以下局域化。然而,在SP的定位和利用常规远场光学器件可以检测到SP的效率之间存在一般的折衷。在这里,我们描述了一种新的全电SP检测技术的基础上引导等离子体激元和纳米线场效应晶体管之间的近场耦合。我们使用的技术,以电检测从一个单独的胶体量子点耦合到SP波导的等离子体发射。我们的探测器是纳米级和高效的(0.1电子/等离子体),等离子体门控效应可用于放大信号甚至更高(高达50电子/等离子体)。这些结果使新的芯片上的光学传感应用,是一个关键的一步,“黑暗”optoplasmonic纳米电路中,SP可以产生,操纵和检测,而不涉及远场辐射。

英文摘要:

Photonic circuits can be much faster than their electronic counterparts, but they are difficult to miniaturize below the optical wavelength scale. Nanoscale photonic circuits based on surface plasmon polaritons (SPs) are a promising solution to this problem because they can localize light below the diffraction limit. However, there is a general tradeoff between the localization of an SP and the efficiency with which it can be detected with conventional far-field optics. Here we describe a new all-electrical SP detection technique based on the near-field coupling between guided plasmons and a nanowire field-effect transistor. We use the technique to electrically detect the plasmon emission from an individual colloidal quantum dot coupled to an SP waveguide. Our detectors are both nanoscale and highly efficient (0.1 electrons/plasmon), and a plasmonic gating effect can be used to amplify the signal even higher (up to 50 electrons/plasmon). These results enable new on-chip optical sensing applications and are a key step towards "dark" optoplasmonic nanocircuits in which SPs can be generated, manipulated, and detected without involving far-field radiation.

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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