한국광학회지 (Korean Journal of Optics and Photonics)

  • 제17권3호
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  • Pages.262-267
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  • 2006
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  • 1225-6285(pISSN)
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  • 2287-321X(eISSN)
한국광학회 (Optical Society of Korea)
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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

  • 권재영 (경북대학교 전자전기컴퓨터학부) ;
  • 김현덕 (경북대학교 전자전기컴퓨터학부) ;
  • 송재원 (경북대학교 전자전기컴퓨터학부)
  • Kwon, Jai-Young (School of Electrical Engineering and Computer Science, Kyungpook National University) ;
  • Kim, Hyun-Deok (School of Electrical Engineering and Computer Science, Kyungpook National University) ;
  • Song, Jae-Won (School of Electrical Engineering and Computer Science, Kyungpook National University)
  • 발행 : 2006.03.01
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초록

효율적인 PPLN 제작을 위하여 DC 전계를 인가하면서 $LiNbO_3$에 인가되는 전압 및 전류를 실시간으로 측정할 수 있는 실험 장치를 제안하였다. 제안된 실험 장치를 사용함으로써 PPLN의 분극반전에 필요한 충분한 전하량을 공급하기 위한 전계인가시간을 수초 단위로 증가시킬 수 있어 $LiNbO_3$에 주입되는 전하량의 조절을 용이하게 할 수 있었다. 또한 PPLN의 분극반전 과정을 단계별로 분류하고 각 단계별 실험결과를 바탕으로 분석함으로써 최적의 PPLN 제작조건을 구할 수 있었다.

We proposed a PPLN fabrication setup that measures the voltage and current applied to $LiNbO_3$ in real time during application of a DC electric field. Because the duration for transferring a sufficient electron charge to $LiNbO_3$ increases, we are able to control the electron charge flow transferred to $LiNbO_3$ 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/$LiNbO_3$ interface(state 3), Domain inversion under the insulator layer after breakdown(state 4), and Lowering the electric field applied to $LiNbO_3$ (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.

키워드

참고문헌

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