Photonics Research, 2017, 5 (5): 05000450, Published Online: Sep. 12, 2017  

Coupled quantum molecular cavity optomechanics with surface plasmon enhancement Download: 625次

Jian Liu 1,2Ka-Di Zhu 1,2,*
Author Affiliations
1 Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), 800 DongChuan Road, Shanghai 200240, China
2 School of Physics and Astronomy, Shanghai Jiao Tong University, 800 DongChuan Road, Shanghai 200240, China
Abstract
Cavity optomechanics is applied to study the coupling behavior of interacting molecules in surface plasmon systems driven by two-color laser beams. Different from the traditional force–distance measurement, due to a resonant frequency shift or a peak splitting on the probe spectrum, we have proposed a convenient method to measure the van der Waals force strength and interaction energy via nonlinear spectroscopy. The minimum force value can reach approximately 10?15 N, which is 3 to 4 orders of magnitude smaller than the widely applied atomic force microscope (AFM). It is also shown that two adjacent molecules with similar chemical structures and nearly equal vibrational frequencies can be easily distinguished by the splitting of the transparency peak. Based on this coupled optomechanical system, we also conceptually design a tunable optical switch by van der Waals interaction. Our results will provide new approaches for understanding the complex and dynamic interactions in molecule–plasmon systems.

Jian Liu, Ka-Di Zhu. Coupled quantum molecular cavity optomechanics with surface plasmon enhancement[J]. Photonics Research, 2017, 5(5): 05000450.

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