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Normal‐Mode Splitting in a Weakly Coupled Electromechanical System with a Mechanical Modulation
Author(s) -
Zhang ZhuCheng,
Wang YiPing,
Yu YaFei,
Zhang ZhiMing
Publication year - 2019
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.201800461
Subject(s) - modulation (music) , displacement (psychology) , coupling (piping) , physics , work (physics) , mechanical system , field (mathematics) , mechanical energy , materials science , acoustics , quantum mechanics , mathematics , psychology , power (physics) , artificial intelligence , computer science , pure mathematics , metallurgy , psychotherapist
Normal‐mode splitting (NMS) is one of the most significant manifestations of strongly coupled systems. Here, NMS is shown to occur in a weakly coupled electromechanical system. In this system, an exponentially enhanced electromechanical coupling is obtained by periodically modulating the electromechanical interaction and the mechanical spring constant. Under the mechanical modulation, an obvious NMS can occur in the fluctuation spectra of the mechanical oscillator's displacement and the output field. Besides, the Stokes and anti‐Stokes fields can also display an obvious NMS. Interestingly, the Stokes field can be changed from full absorption to significant amplification, and the anti‐Stokes field can also be enhanced significantly. Another novel feature of the results is that the intensity between the two peaks in NMS is almost zero, which means that the two peaks can be well resolved in experiments. This work presents an effective method for the generation of a well‐resolved NMS in a weakly coupled system.