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- W4308032962 abstract "A novel optical beam deflector based on a Lithium niobate (LN) waveguide is demonstrated, which can operate at both electro-optic and thermo-optic modes. At the electro-optic mode, the microstructured serrated electrodes induce inhomogeneous change in the refraction index of LN waveguide via the Pockels effect when a voltage is applied. The incident beam is thus deflected with the deflected distance changing linearly with the applied voltage. A high deflection speed up to 2.5 GHz is observed experimentally. The optical beam deflector can operate at the thermo-optic mode, where the deflected distance depends on the applied electric power; thus it varies quadratically with the applied voltage. The deflection capacity at the thermo-optic mode is much higher than electro-optic mode, since the deflection distances are respectively 27.19 and 2.53 μ m for the thermo-optic and electro-optic modes at a 4 V applied voltage. Therefore, the distinct electro-optic and thermo-optic operating modes enable the LN optical beam deflector to be qualified for various tasks, such as optical scanning, optical modulator. • The electro-optic and thermo-optic operating modes of the LN deflector are demonstrated theoretically and experimentally. The two operating modes can be easily switched by connecting/disconnecting the GND and OUT ports. The underlying physics and deflection features have been investigated in detail. In both modes, the outputted beams keep in good quasi-Gaussian shapes. • A high deflection speed up to 2.5 GHz is observed experimentally. With a high deflection efficiency at the electro-optic mode, a 2.5 GHz signal response is observed experimentally with an extinction ratio 1.96 dB under a RF driving signal of 0.2 V amplitude. This finding pave the way for the high speed modulator based on beam deflection principle, which is extremely broadband. • The thermo-optic operating mode has a high deflection capacity. The deflection distances are 2.53 and 27.19 μ m for the thermo-optic and electro-optic modes at 4 V applied voltage. The deflection capacity of the thermo-optic operating mode allows us to realize low-voltage driving beam deflection." @default.
- W4308032962 created "2022-11-07" @default.
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- W4308032962 date "2023-02-01" @default.
- W4308032962 modified "2023-09-26" @default.
- W4308032962 title "Lithium niobate optical beam deflectors operating at both electro-optic and thermo-optic modes" @default.
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- W4308032962 doi "https://doi.org/10.1016/j.optcom.2022.129093" @default.
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