주입 전하량의 실시간 제어에 의한 PPLN 제작 및 분극반전 과정 분석
Fabrication of PPLN by Real-Time Control of a Transferred Charge and Analysis of Domain Inversion Process
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초록
율적인 PPLN 제작을 위하여 DC 전계를 인가하면서 LiNbO3에 인가되는 전압 및 전류를 실시간으로 측정할 수 있는 실험 장치를 제안하였다. 제안된 실험 장치를 사용함으로써 PPLN의 분극반전에 필요한 충분한 전하량을 공급하기 위한 전계인가시간을 수초단위로 증가시킬 수 있어 LiNbO3에 주입되는 전하량의 조절을 용이하게 할 수 있었다. 또한 PPLN의 분극반전 과정을 단계별로 분류하고 각 단계별 실험결과를 바탕으로 분석함으로써 최적의 PPLN 제작조건을 구할 수 있었다.
Abstract
We proposed a PPLN fabrication setup that measures the voltage and current applied to LiNbO3 in real time during application of a DC electric field. Because the duration for transferring a sufficient electron charge to LiNbO3 increases, we are able to control the electron charge flow transferred to LiNbO3 efficiently. We divided the domain inversion process of PPLN into 5 states: Nucleation (state 1), Spread of the domain inversion region under the electrode(state 2), Accumulation of the electron charge at the insulator/LiNbO3ㄴ interface(state 3), Domain inversion under the insulator layer after breakdown(state 4), and Lowering the electric field applied to LiNbO3 (state 5). We have found that the Threshold Point is essential for the domain inversion and that the domain inversion process must be stopped within state 3 for the optimum PPLN. Using these results, we could fabricate a stable and reproducible PPLN efficiently.
참고문헌 (11)
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