Molecular Plasmonics
详细信息 查看全文
- 作者：Adam Lauchner ; Andrea E. Schlather ; Alejandro Manjavacas ; Yao Cui ; Michael J. McClain ; Grant J. Stec ; F. Javier Garc铆a de Abajo ; Peter Nordlander ; Naomi J. Halas
- 刊名：Nano Letters
- 出版年：2015
- 出版时间：September 9, 2015
- 年：2015
- 卷：15
- 期：9
- 页码：6208-6214
- 全文大小：382K
- ISSN：1530-6992
文摘
Graphene supports surface plasmons that have been observed to be both electrically and geometrically tunable in the mid- to far-infrared spectral regions. In particular, it has been demonstrated that graphene plasmons can be tuned across a wide spectral range spanning from the mid-infrared to the terahertz. The identification of a general class of plasmonic excitations in systems containing only a few dozen atoms permits us to extend this versatility into the visible and ultraviolet. As appealing as this extension might be for active nanoscale manipulation of visible light, its realization constitutes a formidable technical challenge. We experimentally demonstrate the existence of molecular plasmon resonances in the visible for ionized polycyclic aromatic hydrocarbons (PAHs), which we reversibly switch by adding, then removing, a single electron from the molecule. The charged PAHs display intense absorption in the visible regime with electrical and geometrical tunability analogous to the plasmonic resonances of much larger nanographene systems. Finally, we also use the switchable molecular plasmon in anthracene to demonstrate a proof-of-concept low-voltage electrochromic device.