Photonics Research, 2018, 6 (9): 09000867, Published Online: Aug. 15, 2018  

Room temperature optical mass sensor with an artificial molecular structure based on surface plasmon optomechanics Download: 644次

Jian Liu 1,2,3Ka-Di Zhu 1,2,3,*
Author Affiliations
1 Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shanghai 200240, China
2 School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
3 Collaborative Innovation Center of Advanced Microstructures, Nanjing 210000, China
Abstract
We propose an optical weighing technique with a sensitivity down to a single atom through the coupling between a surface plasmon and a suspended graphene nanoribbon resonator. The mass is determined via the vibrational frequency shift on the probe absorption spectrum while the atom attaches to the nanoribbon surface. We provide methods to separate out the signals of the ultralow frequency vibrational modes from the strong Rayleigh background, first based on the quantum coupling with a pump-probe scheme. Owing to the spectral enhancement in the surface plasmon and the ultralight mass of the nanoribbon, this scheme results in a narrow linewidth (GHz) and ultrahigh mass sensitivity (30 yg). Benefitting from the low noises, our optical mass sensor can be achieved at room temperature and reach ultrahigh time resolution.

Jian Liu, Ka-Di Zhu. Room temperature optical mass sensor with an artificial molecular structure based on surface plasmon optomechanics[J]. Photonics Research, 2018, 6(9): 09000867.

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