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arXiv 1503.03789cond-mat.mes-hallphysics.optics
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六方氮化硼隧道结的双光子耦合发射

Antenna-coupled photon emission from hexagonal boron nitride tunnel junctions

Markus Parzefall, Palash Bharadwaj, Achint Jain, Kenji Watanabe, Takashi Taniguchi, Lukas Novotny

摘要:

在纳米尺度下,电信号到光信号的超快转换对于数据处理、电信和光互连具有根本意义。然而,半导体LED的调制带宽受到电子-空穴对的自发复合速率的限制,并且电驱动超快激光器的占用空间对于实际的片上集成来说太大。金属-绝缘体-金属(MIM)隧道结接近电子器件的最终尺寸极限,并且其操作速度从根本上仅受隧穿时间限制。在这里,我们研究的电子能量的转换-本地化的垂直金-h-BN-金隧道结-到自由空间的光子,介导的谐振槽天线。光学天线有效地弥补了纳米尺度体积与远场辐射之间的尺寸失配,极大地提高了电子-光子转换效率。我们实现了非弹性电子隧穿的偏振、定向和共振增强发光,为研究电子与强电磁场的相互作用建立了一个新的平台。我们的研究结果铺平了道路,通过纳米光子设计原理和纳米电子学的结合,使纳米光源的进一步发展。

英文摘要:

The ultrafast conversion of electrical to optical signals at the nanoscale is of fundamental interest for data processing, telecommunication and optical interconnects. However, the modulation bandwidths of semiconductor LEDs are limited by the spontaneous recombination rate of electron-hole pairs and the footprint of electrically-driven ultrafast lasers is too large for practical on-chip integration. A metal-insulator-metal (MIM) tunnel junction approaches the ultimate size limit of electronic devices and its operating speed is fundamentally limited only by the tunneling time. Here we study the conversion of electron energy - localized in vertical gold-h-BN-gold tunnel junctions - into free space photons, mediated by resonant slot antennas. Optical antennas efficiently bridge the size-mismatch between nanoscale volumes and far-field radiation and strongly enhance the electron-photon conversion efficiency. We achieve polarized, directional and resonantly enhanced light emission from inelastic electron tunneling and establish a novel platform for studying the interaction of electrons with strong electromagnetic fields. Our results pave the way for the further development of nanoscopic sources of light enabled by the combination of nanophotonic design principles and nanoelectronics.

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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