Broadband opto-mechanical phase shifter for photonic integrated circuits

Details Broadband opto-mechanical phase shifter for photonic integrated circuits Broadband opto-mechanical phase shifter for photonic integrated circuits

2012-02-15

arxiv.org/abs/1202.3239v1

Physics

Optics

Scientific paper

A broadband opto-mechanical phase shifter for photonic integrated circuits is proposed and numerically investigated. The structure consists of a mode-carrying waveguide and a deformable non-mode-carrying nanostring, which are parallel with each other. Utilizing the optical gradient force between them, the nanostring can be deflected. Thus the effective refractive indices of the waveguide is changed with the deformation, and further causes a phase shift. The phase shift under different geometry sizes, launched powers and boundary conditions are calculated and the dynamical properties as well as the thermal noise's effect are also discussed. It is demonstrated that a $\pi$ phase shift can be realized with only about 0.64 mW launched power and 50 $\mu m$ long nanostring. The proposed phase shifter may find potential usage in future investigation of photonic integrated circuits.

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