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Design and Construction of Fluorescent Confocal Microscopy Setup for Detection of Single Photon Emitters in 2d Materials

Ebrahimi, Abolfazl | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56488 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Esfandiar, Ali
  7. Abstract:
  8. The main goal of this research is to detect and characterize single-photon emitters in two-dimensional hexagonal boron nitride crystal with the help of fluorescence confocal microscope and Hanbury-Brown and Twiss interferometer. The origin of single-photon radiation in this crystal is not precisely known. It seems that the transition between energy levels, which occurs due to the presence of point defects in the crystal structure of this material, in the distance between the conduction and valence bands, is the source of single-photon radiation. This material does not require low temperature for single-photon radiation, which is an important advantage for it. In a confocal microscope, the incoming laser light is focused at the sample location through an objective lens, and the fluorescence light is collected through the same lens and directed to the detector. The basis of confocal microscope work is to eliminate the light emitted from non-focal planes by placing a very small aperture in front of the detector. Also, in this arrangement, unlike the wide field microscope, which uses a camera to record the image, the surface of the sample is scanned with the help of a nano positioner device. By sweeping the sample in three spatial directions, it is possible to form three-dimensional images, which is one of the advantages of the confocal microscope. This microscope is used to find single photon emitters in solid state systems (hexagonal boron nitride in this research). The Hanbury-Brown and Twiss interferometer consists of a beam splitter and two detectors in its two arms. The intensity correlation between these two detectors gives important information about the input beam to the interferometer. This interferometer can be used to prove that the return radiation from the sample is single-photon radiation
  9. Keywords:
  10. Hexagonal Boron Nitride ; Fluorescence Radiation ; Twiss Interferometer ; Hanbury-Brown Interferometer ; Single Photon Emitter ; Confocal Microscope

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