Open Access Highly Accessed Nano Express

The coupling between localized surface plasmons and excitons via Purcell effect

Feng Wang, Dongsheng Li*, Deren Yang and Duanlin Que

Author Affiliations

State Key Laboratory of Silicon Materials and Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, People’s Republic of China

For all author emails, please log on.

Nanoscale Research Letters 2012, 7:669  doi:10.1186/1556-276X-7-669

Published: 7 December 2012

Abstract

The coupling between localized surface plasmons (LSPs) within silver nanostructures and excitons in a silicon-rich silicon nitride (SiNx) matrix has been demonstrated via the Purcell effect. A simple model is employed for the estimation of the Purcell factor as well as the average position of excitons within a luminescence matrix. The estimated average position of the excitons is located at approximately 40 nm beneath the top surface of the SiNx films. The approaches for further improving the optoelectrical properties of the luminescence matrix are anticipated based on the model we adopted. The optimization of the thickness of the luminescence matrix as well as the size and shape of metal nanostructures may be the alternative approaches. Besides, the application of multilayers with the luminescence matrix inserted between barrier layers (we defined it as confined structures here) may be also an available choice. Our work may provide a deep comprehension on the coupling between LSPs and excitons, which is not limited to a certain luminescence material but with unconfined structures.

Keywords:
Localized surface plasmons; Silicon-rich silicon nitride; Silver nanostructures; Average position of excitons; Luminescence