Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Characterization of optical waveguides with near - field scanning optical microscope

근접장 주사 광학현미경을 이용한 광 도파로 특성 연구

  • Ji, Won-Soo (School of Information and Communication Engineering, Inha University) ;
  • Kim, Dae-Chan (School of Information and Communication Engineering, Inha University) ;
  • Lee, Seung-Gol (School of Information and Communication Engineering, Inha University) ;
  • O, Beom-Hoan (School of Information and Communication Engineering, Inha University) ;
  • Lee, El-Hang (School of Information and Communication Engineering, Inha University)
  • 지원수 (인하대학교 정보통신공학부, 마이크로 포토닉스 연구 센터) ;
  • 김대찬 (인하대학교 정보통신공학부, 마이크로 포토닉스 연구 센터) ;
  • 이승걸 (인하대학교 정보통신공학부, 마이크로 포토닉스 연구 센터) ;
  • 오범환 (인하대학교 정보통신공학부, 마이크로 포토닉스 연구 센터) ;
  • 이일항 (인하대학교 정보통신공학부, 마이크로 포토닉스 연구 센터)
  • Published : 2002.08.01
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Abstract

The propagation characteristic of an optical waveguide was investigated by measuring with a near-field scanning optical microscope (NSOM) the evanescent field formed at the neighbor of its core-cladding interface. For this purpose, the NSOM system was developed specially as a form of Photon scanning tunneling microscope. The evanescent field distributions of several channel waveguides were measured at the wavelength of 1550 ㎚, and the usefulness of the system was verified by comparing experimental results with simulation results. In particular, the interference phenomena of the guided modes during their propagation along a multimode channel waveguide could be observed directly from the measured evanescent field distribution.

광 도파로를 따라 전파하는 빛의 특성을 측정하기 위해 근접장 주사 광학현미경(Near-field scanning optical microscope, NSOM)으로 광 도파로의 표면에 형성된 에바네슨트 파 evanescent wave)의 분포를 측정하였다. 사용된 NSOM은 photon scanning tunneling microscope방식으로 본 연구의 목적에 적합하도록 직접 제작한 것이다. 광원 파장 1550㎚에서 단일 모드 다중 모드 채널형 광 도파로에 대해 도파로 표면에 형성된 에바네슨트 파의 분포를 측정하였으며, 3차원 빔전파방법(Beam Propagation Method)으로 계산된 수치 해석 결과와 두 모드 간의 간섭 형상을 직접적으로 확인할 수 있었다.

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References

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