Light modulation using a graphene oxide (GO) thin layer in an optical waveguide is proposed and demonstrated. The GO-solution is prepared via enhanced Hummer’s technique and deposited onto the surface of a planar optical waveguide by drop-casting. A polarization dependent loss of 17 dB was measured within the GO-coated optical waveguide using a 1550 nm tunable laser source. Another 405 nm laser perpendicular to the GO layer is used to modulate the 1550 nm signal propagating through the fiber. The 1550 nm signal is observed to change linearly against the power of the 405 nm signal, with an increasing loss of up to 1.7 dB observed at a 405 nm signal power of 12 mW. A rise time of approximately 2 μ s is observed between the ON and OFF states of the waveguide, and indicates that the proposed device would be able to serve a number of real-world applications.

中文翻译：

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GO涂层光波导的光调制特性

提出并说明了在光波导中使用氧化石墨烯（GO）薄层的光调制。GO解决方案是通过增强的Hummer技术制备的，并通过压铸法沉积到平面光波导的表面上。使用1550 nm可调激光源在GO涂层光波导中测量了17 dB的偏振相关损耗。垂直于GO层的另一个405 nm激光用于调制通过光纤传播的1550 nm信号。观察到1550 nm信号相对于405 nm信号的功率线性变化，在12 mW的405 nm信号功率下观察到的损耗增加到1.7 dB。在波导的ON和OFF状态之间观察到大约2μs的上升时间，