Microcavity-engineered plasmonic resonances for strong light-matter interaction
Figure 1. Left. A quantum emitter interacting with a metallic nanostructure in the vacuum. Right. A quantum emitter interacting with a microcavity-engineered metallic nanostructure.
In this work, the researchers report that the dissipation can be suppressed by engineering the electromagnetic environment of metallic nanostructures. An optical microcavity provides a non-trivial electromagnetic environment which substantially broadens the radiative output channel of the metallic nanostructures, guiding the energy out from the dissipative region and thus suppressing the dissipations. With such an interface, energy and information can be guided out from the single quantum emitter at both high speed and high efficiency.
“Theoretical model shows that microcavities-engineered metallic structures can boost the radiation efficiency of a quantum emitter by 40 times and the radiation output rate by 50 times, compared to metallic nanostructures in the vacuum”, said Peng Pai, who was an undergraduate at Peking University and now is a Ph.D. student at Massachusetts Institute of Technology. Importantly, reversible energy exchange between the photon and the quantum emitter at THz rate can be achieved, manifesting the strong light-matter interaction at the quantum level.
“Our approach to reducing the dissipations is not restricted by the scale, shape, and material of the metallic nanostructures,” said Professor Xiao. “In combination with previous approaches, it is promising to build the state-of-the-art light-matter interface at nanoscale using microcavity-engineered metallic nanostructures, providing a new platform for the study of quantum plasmonics, quantum information processing, precise sensing and advanced spectroscopy.”
More information: Pai Peng, Yong-Chun Liu, Da Xu, Qi-Tao Cao, Guowei Lu, Qihuang Gong, and Yun-Feng Xiao, “Enhancing Coherent Light-Matter Interactions through Microcavity-Engineered Plasmonic Resonances,” Phys. Rev. Lett. 119, 233901 (2017) – Published 4 December 2017
Edited by: Zhang Jiang
Source: School of Physics