Dr. Yuhui Zhang Profile

Dr. Yuhui Zhang

at Changchun Univ of Science and Technology

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Proceedings Article | 12 March 2021 Paper

Terahertz wavefront manipulation in graphene metalens for dual polarization incidences

Yuhui Zhang, Yuegang Fu

Proceedings Volume 11763, 117630X (2021) https://doi.org/10.1117/12.2586174

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We proposed a metalens structure based on graphene in the Terahertz (THz) regime by using the finite-difference timedomain method. The structure consists of two layers of graphene arrays, polymer dielectric spacer and a gold mirror film. The proposed metalens can realize two functions. The first function is to control x-polarized incidence and y-polarized incidence respectively by two layers of graphene, that is, to regulate x-polarized incidence when the working voltage is applied to the lower graphene and 0 voltage is applied to the upper graphene. When the working voltage is applied to the upper graphene and the 0 voltage is applied to the lower graphene, y-polarized incidence is regulated. The second function is to apply 0 voltage to the lower graphene, and regulate both x-and y-polarized incidence by changing the Fermi level of the upper graphene. The simulation results of FDTD show that the metalens structure can not only achieve different functions, but also the focusing effect is in good agreement with the design value. This work provides a new method for wavefront manipulation of metalens.

Proceedings Article | 25 October 2016 Paper

All-optical relative intensity noise suppression method for the high precision fiber optic gyroscope

Yue Zheng, Chunxi Zhang, Lijing Li, Lailiang Song, Yuhui Zhang

Proceedings Volume 10158, 101580L (2016) https://doi.org/10.1117/12.2246725

KEYWORDS: Fiber optic gyroscopes, Signal to noise ratio

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The relative intensity noise (RIN) is a main factor that limits the detection accuracy of the high precision fiber optic gyroscope (FOG). The RIN spectrum is determined by the normalized autocorrelation of the optical spectrum of the broadband source and is intrinsically different from other fundamental noises. In this paper, we propose an all-optical technique to suppress the RIN. With the power addition of the optical waves from the signal optical path and the reference optical path, the RIN is effectively eliminated at the eigen frequency of the FOG, which is also the demodulation window for the rotation rate signal. Compared with the traditional optical configuration of the FOG, there is only one additional optical component. Experimental results show that, with this method, we can achieve a nearly 3-fold improvement in the angular random walk coefficient. The improved optical configuration for RIN suppression is simple to realize and suitable for engineering application.

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