Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Theoretical Calculation on Radiation Patterns of Epi-signal in CARS Microscopy

간섭성 반스톡스 라만 산란 현미경 후방 신호지 방사패턴에 관한 이론계산 연구

  • 유용심 (한국표준과학연구원 기반표준부) ;
  • 조혁 (충남대학교 물리학과)
  • Published : 2007.08.25
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Abstract

We theoretically investigated the far-field radiation pattern of epi-signal from a polystyrene sphere in coherent anti-Stokes Raman scattering (CARS) microscopy with an objective lens of high numerical aperture. We calculated the field distribution of the incident laser beams under the tight-focusing condition and the far-field radiation pattern through coherent addition of radiation from the nonlinear polarizations (Hertzian dipoles) as the origin of CARS signal generation. The epi-radiation patterns for polystyrene spheres of different diameters are calculated, and the pattern of a sphere is also compared with that of a shell fer a diameter of 1100 nm. We finally show how the radiation pattern of the polystyrene sphere changes as the center of the sphere shifts from the focus of the beam.

높은 수치구경의 대물렌즈를 사용하는 간섭성 반스톡스 라만 산란 현미경(coherent anti-Stokes Raman scattering microscopy)에서 폴리스틸렌구에서 발생한 신호의 먼거리장 방사패턴에 대한 이론적 계산 연구를 수행하였다. 극초점 조건에서 입사 레이저 광의 전기장 분포를 계산하였고, CARS 신호 생성원인인 비선형 분극(헤르치안 쌍극자) 방사의 간섭성 합을 통하여 먼거리장 방사 패턴을 계산하였다. 폴리스틸렌구의 크기에 따른 후방 방사패턴을 계산하였고, 1100 nm 직경을 가진 폴리스틸렌구와 폴리스틸렌 구껍질의 방사패턴을 비교하였다. 또한, 극초점으로부터 폴리스틸렌구의 중심이 이동함에 따른 방사패턴의 변화를 보였다.

Keywords

References

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