Raman Microscopy - simple question

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Discussion Overview

The discussion revolves around the best methods for holding micron-sized polystyrene beads for Raman microscopy. Participants explore various techniques and considerations related to sample preparation and the effects on microscopy results.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests using carbon tape, commonly used in electron microscopy, as a potential method for holding the samples.
  • Another participant proposes using a roughened glass slide, arguing that it may provide enough confinement to keep the beads still, but shares a concern about charging effects that could cause particles to move.
  • A different participant questions whether roughened glass might diffract the focused input beam and considers alternative methods such as optical trapping or placing the beads in a drop of water on a microscope slide.
  • One participant references an application of Raman microscopy involving the visualization of roughened surfaces, indicating that rough surfaces can be relevant in certain contexts.
  • Another participant distinguishes between Spontaneous Raman Microscopy and Coherent Antistokes Raman Microscopy, suggesting that slide preparation may have different levels of importance depending on the method used.

Areas of Agreement / Disagreement

Participants express differing opinions on the effectiveness of various sample holding methods, and there is no consensus on the best approach. The discussion remains unresolved with multiple competing views presented.

Contextual Notes

Participants mention potential issues such as diffraction from rough surfaces and charging effects, but do not fully resolve these concerns or clarify the implications for different Raman microscopy techniques.

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What's the best way to hold a sample of micron-sized polystyrene beads for raman microscopy?
 
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My first attempt would be carbon tape of the type used in electron microscopy. Other than that, you might try to get one to sit still enough on a roughened glass slide. There should be enough confinement in the rough part of a glass slide to hold one still. I can tell you from experience that the rough glass slide won't hold micron-sized silicate particles still in the EM... too much charging and the particle flys off to find something to dump it's extra electrons onto.
 
roughened glass? Wouldn't that diffract my focussed input beam? I'm thinking of either 'optically trapping' it, or just placing it in a drop of water on a microscope slide. Also, does anyone know by anychance why they use water in specific?
 
See http://www.nanophoton.jp/eng/raman/raman-11_application.html" . Visualizing the roughened surface of a diamond file, for example, is one of the applications of raman microscopy.
 
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I think that was more too do with Spontaneous Raman Microscopy. In which case the slide preparation isn't as important as Coherent Antistokes Raman Microscopy - which is what I'm doing.
 

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