- #1
philip041
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Am I right in saying that a tapered optical fibre 'collects' light from evanscent field. Why would this mean it needs to oscillate as it scans a sample surface?
Cheers!
philip
Cheers!
philip
Low amplitude oscillation is necessary in SNOM (Scanning Near-field Optical Microscopy) because it allows for more precise and accurate measurements of the sample's surface. This is because the near-field signal is highly sensitive to changes in the tip-sample distance, and by using a low amplitude oscillation, the tip is able to scan the surface at a constant distance, resulting in a more reliable measurement.
Low amplitude oscillation is crucial for achieving high resolution in SNOM. By keeping the tip at a constant distance from the sample, it eliminates any potential blurring or distortion that may occur with larger oscillations. This leads to sharper and more detailed images of the sample's surface.
No, high amplitude oscillation is not suitable for use in SNOM. This is because it can cause damage to the sample's surface and it can also result in inaccurate measurements due to the tip-sample distance constantly changing. Low amplitude oscillation is necessary for obtaining reliable and precise data.
No, there are other factors that can also affect SNOM measurements, such as the composition and properties of the sample, the type of tip used, and the environment in which the measurement is conducted. However, low amplitude oscillation is a critical factor that must be carefully controlled in order to obtain accurate and meaningful data.
One potential disadvantage of using low amplitude oscillation in SNOM is that it can increase the measurement time. This is because the tip must scan the surface at a slower speed in order to maintain a constant distance. However, the benefits of using low amplitude oscillation, such as improved resolution and accuracy, outweigh this potential drawback.