Random laser spectroscopy for nanoscale perturbation sensing

Qinghai Song, Purdue University - Main Campus
Shumin Xiao, Purdue University - Main Campus
Zhengbin Xu, Purdue University - Main Campus
V. M. Shalaev, Birck Nanotechnology Center and School of Electrical and Computer Engineering, Purdue University
Young L. Kim, Purdue University - Main Campus

Abstract

We report a spectroscopic method using coherent random lasers for a simple, yet nanoscale, sensing approach. Unique spectral properties of coherent random laser emission can be detectably altered when introducing nanoscale perturbations to a simple nanocomposite film that consists of dielectric nanospheres and laser-dye-doped polymer to serve as a transducer. Random lasing action provides a means to amplify subtle perturbations to readily detectable spectral shifts in multiple discrete emission peaks. Owing to several advantages, such as large-area detection, narrow and multiple emission peaks, straightforward detection, and simple fabrication, random laser spectroscopy has the potential for ultrasensitive, yet simple, biosensors in various applications.

Discipline(s)

Engineering | Nanoscience and Nanotechnology