• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2001 Fiscal Year Final Research Report Summary

Phase Retrieval Microscope Based on Photon Counting Image Detection

Research Project

Project/Area Number 10450029
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied optics/Quantum optical engineering
Research InstitutionWaseda University

Principal Investigator

KOMATSU Shinichi  Waseda University, School of Science and Engineering, Professor, 理工学部, 教授 (00087446)

Co-Investigator(Kenkyū-buntansha) HATTORI Masayuki  Waseda University, School of Science and Engineering, Assistant, 理工学部, 助手 (20308208)
Project Period (FY) 1998 – 2001
Keywordsphase recovery / photon counting / visualization / inverse problem / lightwave sensing / photon imaging / optical measurements / accurate measurements
Research Abstract

The accuracy and sensitivity of the phase retrieval from a Fraunhofer diffraction pattern greatly depend on the dynamic range of the measured Fraunhofer diffraction pattern. In this study, the photon-imaging detector was adopted to detect higher order diffraction spots of a very weak phase grating. The phase retrieval was accomplished experimentally fairly well from the Fraunhofer diffraction intensity distribution data including up to the third order diffraction spots to which the iterative Fourier transform algorithms were applied. The object phase distribution was retrieved with fairly high accuracy and sensitivity. A newly introduced procedure for measuring the entire diffraction pattern with single photon-imaging detector is also described.
The application of the ML-EM (maximum likelihood-expectation maximization) method to the processing of images of extremely low intensity, which is detectable only with a photon counting camera, is also examined. The influence of the photon noise is also quantitatively examined. It is experimentally shown that the ML-EM produces better restoration than the Wiener filter in the extremely low intensity region where the maximal number of photons per pixel is less than about one hundred.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Y.Kamura: "Phase Retrieval Microscope for Quantitative Imaging of a Weak Phase Object"Jpn.J.Appl.Phys.. 37. 6018-6019 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Ohno: "Image Restoration and Object Distance Evaluation from a Defocused Photon Image"Proc.SPIE. 4416. 412-415 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Nakashima: "Phase Retrieval Microscope Using photon Imaging Detector"Tech.Dig.MOC. 8. 270-273 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Kamura: "Phase Retrieval Microscope for Quantitative Imaging of a Weak Phase Object"Jpn. J. Appl. Phys.. 37. 6018-6019 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Ohno: "Image Restoration and Object Distance Evaluation from a Defocused Photon Image"Proc. SPIE. 4416. 412-415 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Nakashima: "Phase Retrieval Microscope Using Photon Imaging Detector"Tech.Digest MOC. 8. 270-273 (2001)

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2003-09-17  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi