Electrically-Excited Surface Plasmon Polaritons with Directionality Control
23 Feb 2015

Submitted by (Bold are A*Star Staff): Zhaogang Dong,Hong-Son Chu,Di Zhu,Wei Du,Yuriy A. Akimov,Wei Peng Goh,Tao Wang,Kuan Eng J. Goh,C. Troadec ,Christian A. Nijhuis,Joel K. W. Yan

Research Institute: IHPC

Title of Paper: Electrically-Excited Surface Plasmon Polaritons with Directionality Control

Published in: American Chemical Society

Abstract: Compact electrical sources of surface plasmon polaritons (SPPs) are promising for integration with high-speed electronics. Being a highly compact source, the point dipole has the ability to directly couple to surface plasmon modes, and be electrically driven through the inelastic tunneling of electrons, for example, at the tip of a scanning tunneling microscope (STM). However, the directional control of electrically excited SPPs from such compact sources has not been demonstrated, despite its importance in controlling the optical energy flow on a chip. In this paper, we present a comprehensive analysis of the directional excitation of SPPs on Au 1D cavity by moving an STM tip relative to the edge of the cavity stripe and analyzing the light collected through an inverted microscope. The directional propagation of the SPP and its far-field emission exhibit a clear cyclic dependence on the relative distance from this edge. These results provide key steps toward realizing compact solid-state devices with the ability to excite and direct the propagation of light.

URL: http://pubs.acs.org/doi/abs/10.1021/ph5004303

Acknowledegment remark in publication: Chu would like to acknowledge the support of the A*STAR Computational Resource Centre through the use of its high performance computing facilities.