LabAdviser/314/Microscopy 314-307/Technique/Holo: Difference between revisions
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'''Feedback to this page''': '''[mailto:labadviser@nanolab.dtu.dk?Subject=Feed%20back%20from%20page%20http://labadviser.nanolab.dtu.dk/index.php/LabAdviser/314/Technique/X-ray_spectroscopyHolo click here]''' | '''Feedback to this page''': '''[mailto:labadviser@nanolab.dtu.dk?Subject=Feed%20back%20from%20page%20http://labadviser.nanolab.dtu.dk/index.php/LabAdviser/314/Microscopy_314-307/Technique/X-ray_spectroscopyHolo click here]''' | ||
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[[Category:314]] | [[Category:314]] | ||
[[Category:314-Microscopy]] | [[Category:314-Microscopy]] | ||
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Off-axis electron holography is a transmission electron microscopy technique that is sensitive to the phase of the electrons passing through the specimen. The measurement of phase changes of electrons is very important for measuring material properties like mean inner potential and built-in potential. It is also very important in measuring charge distribution across specimens at a high spatial resolution. In this technique a part of the electron beam passes through the specimen and the other part passes through vacuum. A biprism wire (see the below figure) in the plane of the SAD apertures is held at a fixed potential and this creates an interference pattern between the electrons passing through the specimen and vacuum. | Off-axis electron holography is a transmission electron microscopy technique that is sensitive to the phase of the electrons passing through the specimen. The measurement of phase changes of electrons is very important for measuring material properties like mean inner potential and built-in potential. It is also very important in measuring charge distribution across specimens at a high spatial resolution. In this technique a part of the electron beam passes through the specimen and the other part passes through vacuum. A biprism wire (see the below figure) in the plane of the SAD apertures is held at a fixed potential and this creates an interference pattern between the electrons passing through the specimen and vacuum. | ||
[[file:Off-axis_Holo_sketch.png|thumb|150px| | [[file:Off-axis_Holo_sketch.png|thumb|150px|left|Schematic of the set-up for off-axis electron holography and example image [https://link.springer.com/chapter/10.1007%2F978-3-030-00069-1_16]]] | ||
<br clear=all> | <br clear=all> | ||
The detailed procedure for obtaining electron holograms as well as thickness measurements using convergent beam electron diffraction is described below. The procedure has been used for obtaining holograms of GaAs nanowires, but it can be applied to other specimens. Some tips are also given at the end of this document. | The detailed procedure for obtaining electron holograms as well as thickness measurements using convergent beam electron diffraction is described below. The procedure has been used for obtaining holograms of GaAs nanowires, but it can be applied to other specimens. Some tips are also given at the end of this document. | ||
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== more detailed information == | == more detailed information == | ||
*[[LabAdviser/314/Technique/Holo/Off-axis_ATEM|Off-axis holography at the ATEM]] | *[[LabAdviser/314/Microscopy_314-307/Technique/Holo/Off-axis_ATEM|Off-axis holography at the ATEM]] (microscope not available at DTU Nanolab anymore) | ||
*[[LabAdviser/314/Microscopy_314-307/Technique/Holo/Off-axis_ETEM|Off-axis holography at the ETEM]] | |||
== relevant microscopes == | |||
*[[LabAdviser/314/Microscopy_314-307/TEM/ATEM|Titan ATEM]] (microscope not available at DTU Nanolab anymore) | |||
*[[LabAdviser/314/Microscopy_314-307/TEM/ETEM|Titan ETEM]] | |||
== literature == | == literature == | ||
*[https://link.springer.com/chapter/10.1007%2F978-3-030-00069-1_16 Handbook of Microscopy, P.W. Hawkes and J.C.H. Spence; Springer (2019)] | *[https://link.springer.com/chapter/10.1007%2F978-3-030-00069-1_16 Handbook of Microscopy, P.W. Hawkes and J.C.H. Spence; Springer (2019)] | ||
Latest revision as of 09:20, 7 May 2024
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This section is written by DTU Nanolab internal if nothing else is stated.
Off-axis Electron Holography
Off-axis electron holography is a transmission electron microscopy technique that is sensitive to the phase of the electrons passing through the specimen. The measurement of phase changes of electrons is very important for measuring material properties like mean inner potential and built-in potential. It is also very important in measuring charge distribution across specimens at a high spatial resolution. In this technique a part of the electron beam passes through the specimen and the other part passes through vacuum. A biprism wire (see the below figure) in the plane of the SAD apertures is held at a fixed potential and this creates an interference pattern between the electrons passing through the specimen and vacuum.
The detailed procedure for obtaining electron holograms as well as thickness measurements using convergent beam electron diffraction is described below. The procedure has been used for obtaining holograms of GaAs nanowires, but it can be applied to other specimens. Some tips are also given at the end of this document.
more detailed information
- Off-axis holography at the ATEM (microscope not available at DTU Nanolab anymore)
- Off-axis holography at the ETEM
relevant microscopes
- Titan ATEM (microscope not available at DTU Nanolab anymore)
- Titan ETEM