Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Talbot imaging of periodic amplitude objects and its visibility

주기적인 진폭격자들에 의한 Talbot 결상 및 가시도 분석

  • Kim, Young-Ran (Applied Optics and Electromagnetics, School of Natural Scieces, Hannam University) ;
  • lee, Seung-Bok (Applied Optics and Electromagnetics, School of Natural Scieces, Hannam University) ;
  • Jo, jae-Heung (Applied Optics and Electromagnetics, School of Natural Scieces, Hannam University) ;
  • Chang, Soo (Applied Optics and Electromagnetics, School of Natural Scieces, Hannam University) ;
  • Rim, Cheon-Seog (Applied Optics and Electromagnetics, School of Natural Scieces, Hannam University)
  • 김영란 (한남대학교 자연과학부 광.전자물리학 전공) ;
  • 이승복 (한남대학교 자연과학부 광.전자물리학 전공) ;
  • 조재흥 (한남대학교 자연과학부 광.전자물리학 전공) ;
  • 장수 (한남대학교 자연과학부 광.전자물리학 전공) ;
  • 임천석 (한남대학교 자연과학부 광.전자물리학 전공)
  • Published : 2001.04.01
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Abstract

The Talbot effect for periodic objects with the spatial period p illuminated by expanded coherent light is analyzed by Fresnel diffraction theory, and the Talbot distance (Zr) at which we can observe 1: 1 imaging without any lenses can be defined. We confmned experimentally the Talbot imaging of line, circular, X -type and '||'&'||'copy;-type 2 dimensional alTay gratings at ZT. At the same time, we observed phase reversed Talbot imaging at Zr/2 and Talbot subimage with p/2 at Zr/4 and 3Zr/4. The visibility of Talbot images as a function of the number of slits of the input grating was measured by the FFf (Fast Fourier Transform) results of these images. As a result stationary maximum visibility of V = 0.25 was obtained from grating numbers with more than 15 slit pairs.

주기적인 진폭물체를 가간섭광인 레이저광으로 조명하였을 때 이 물체가 렌즈없이 회절에 의하여 결상되는 Talbot 결상을 회절이론으로 해석하고 물체의 상이 1:1로 결상되는 Talbot 거리(Zr)를 정의 하였다. 그리고 실험적으로 이 Z/sub T//2 위치에서는 위상에서는 위상이 반전되는 현상도 동시에 관찰하였다. 이러한 Talbot 결상시 주기적인 물체의 개수, 즉 격자의 수에 따라 Talbot 상의 가시도를 Talbot 상의 FFT(Fast Fourier Transform)로부터 측정하였으며 그 결과 적어도 15개 이상의 격자들로 구성되어야 가시도 0.25로 정상적인(stationary) Talbot 결상이 됨을 알 수 있었다.

Keywords

References

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