基于非弹性电子隧穿的表面等离激元激发

摘要/Abstract

摘要： 表面等离激元是一种存在于金属(或掺杂半导体)-介质界面的电磁极化和振荡现象,可以显著增强纳米尺度光与物质的相互作用,在波导、生化传感、超快调制、探测以及非线性光学等领域具有重要应用前景。表面等离激元的激发主要采用受衍射极限限制的光学激发方式,通常需要棱镜、光栅等大尺寸光学元件的辅助,这极大限制了等离激元器件的小型化和片上高密度集成。通过将等离激元纳米结构和隧道结集成起来,低能量的隧穿电子可以直接激发该结构的等离激元模式,具有超小尺寸、超快调制速度等优点。本文将回顾基于电子隧穿效应的表面等离激元激发的研究历史,并着重介绍该领域的最新研究进展。

关键词: 表面等离激元, 隧道结, 非弹性电子隧穿, 光学天线, 局域光学态密度, 发光, 波导

Abstract: Surface plasmons are highly confined electromagnetic modes coherently coupled to collective oscillations of free carriers at metal (or doped semiconductor) interfaces, which can greatly enhance light-matter interaction at the nanoscale and have found valuable applications in areas such as waveguiding, biochemical sensing, ultrafast modulation, detection and nonlinear optics. They are usually excited by diffraction-limited optical approaches with the use of bulky optical components (prisms, gratings,etc), which greatly limit the miniaturization of plasmonic devices and their chip-scale high-density integration. By integrating a plasmonic nanostructure with a quantum tunnel junction, low-energy inelastically tunneled electrons can directly excite plasmonic modes in the nanostructure with advantages such as ultra-small footprint and ultra-fast speed. In this paper, recent research progress in the inelastic tunneling-based electric excitation of localized and propagating surface plasmons is overviewed.

Key words: surface plasmon, tunnel junction, inelastic electron tunneling, optical antenna, local density of optical state, light emission, waveguiding

中图分类号:

O482

郑钧升, 刘璐芳, 潘陈馨钰, 郭欣, 童利民, 王攀. 基于非弹性电子隧穿的表面等离激元激发[J]. 人工晶体学报, 2021, 50(7): 1275-1286.

ZHENG Junsheng, LIU Lufang, PAN Chenxinyu, GUO Xin, TONG Limin, WANG Pan. Inelastic Electron Tunneling-Based Excitation of Surface Plasmons[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(7): 1275-1286.

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