Nature Phys. http://doi.org/v7p (2014)
Plasmonic lasers have recently been explored as a means to enhance lasing performances. They take advantage of a metallic cavity that can sustain surface plasmon polariton (SPP) waves to achieve a higher optical confinement and feedback. Even though SPPs can generate highly focused optical excitations at much faster timescales than their photonic counterparts, at present the potential application of plasmonic lasers in everyday technology is limited. In particular, parasitic cavity losses, which are connected to the degree of optical confinement, have an effect on the laser threshold and dynamics. Now, Rupert Oulton and co-authors present a hybrid plasmonic laser that operates at room temperature and shows ultrafast lasing characteristics. This is achieved by matching the energy of the excitons in a ZnO nanowire to the surface plasmon frequency of a Ag-based plasmonic laser in the ultraviolet. Accelerated lasing dynamics were demonstrated when compared with standard ZnO nanowire lasers, with pulses shorter than 800 fs. Even though this supreme speed might not allow the build-up of a population inversion, the improved performance compared with photonic devices clearly shows the potential of plasmonic lasers as an alternative means to obtain ultrafast lasing.
|版权所有 ©2009 中国科学院上海光学精密机械研究所 沪ICP备05015387号|