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Light-Induced In Situ Transmission Electron Microscopy for Observation of the Liquid-Soft Matter Interaction
Published on: July 26, 2022
Fiber optic light collection system for scanning-tunneling-microscope-induced light emission
Neil J Watkins1, James P Long, Zakya H Kafafi
1Naval Research Laboratory, Washington, DC 20375, USA.
The Review of Scientific Instruments
|June 8, 2007
Summary
We developed a simple light collection system for scanning tunneling microscopy (STM) light emission studies. This new method improves efficiency and simplifies alignment, enabling detailed nanoscale imaging.
Area of Science:
- Surface Science
- Nanotechnology
- Optical Physics
Background:
- Scanning tunneling microscopy (STM) is a powerful tool for surface analysis.
- STM-induced light emission (SILE) offers unique insights into surface electronic properties.
- Efficient light collection is crucial for high-resolution SILE experiments.
Purpose of the Study:
- To design and test a compact, retrofittable light collection scheme for STM.
- To enhance light collection efficiency and minimize alignment sensitivity in SILE.
- To demonstrate the system's capability for nanoscale imaging.
Main Methods:
- Utilized a pair of large core diameter, high numerical aperture optical fibers.
- Integrated the fiber collection system onto a standard STM setup.
- Performed bench tests to quantify light collection efficiency and alignment tolerance.
- Conducted photon-map imaging experiments on a stepped Au(111) surface.
Main Results:
- Achieved high light collection efficiency, limited primarily by fiber end reflectivity.
- Demonstrated negligible signal loss due to fiber misalignment.
- Obtained photon-map images with nanometer resolution.
- Exceeded signal rates of 10^4 counts/s on Au(111).
Conclusions:
- The developed light collection scheme is effective and practical for STM-induced light emission.
- The system simplifies experimental setup while maintaining high performance.
- This approach facilitates advanced nanoscale surface characterization using SILE.
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