Dear Research Community,
I'm currently doing experiments in a non-invasive glucose meter but I am finding some papers that their setup have two polarization plates with the sample in between. What I'm curious is why some setup used 0 and 90 degrees but some have 90 and 45 and also some papers uses 0 and 0 degrees accordingly.
Does anyone know why in reflection mode of the laser some setups are 0 90, 90 45, 0 0 for their combination of polarization?
Hello David Chiu ,
there are a range of methods for glucose monitoring. This might be a good start
Article Non-Invasive Blood Glucose Monitoring Technology: A Review
Since there is also scattering involved, using polarizers can help to 'prefer' one type of scattering. For example to see more single scattering than multiple scattering Article Multiple scattering effects on intercept, size, polydispersi...
Hope this helps.
I believe that this reference will help you
https://opentextbc.ca/universityphysicsv3openstax/chapter/polarization/
David Chiu,
>Does anyone know why in reflection mode of the laser some setups are 0 90, 90 45, 0 0 for their combination of polarization?
To give you detailed answer, it is necessary to know description of such setups.
In general, if your sample has extended scattering properties, single scattered light usually keep polarization orientation of incident beam, so for 0° + 90° setup you will mainly suppress single scattering components and increase part of multiple scattered light.
Multiple scattering usually produce depolarization of incident beam, so for the case of 0° + 0° setup in output beam will be stressed single scattering components.
90° + 45° setup probably deals with analysis of circularly polarized scattered components, but in such a case setup has to contain phase retarding components like quarter-wave plate.
David Chiu, I don't know single publication that can answer your question. You should look through classical textbooks like
- Kerker M. The Scattering of Light, and Other Electromagnetic Radiation (New York: Academic Press Inc, San Diego),
- Azzam R. M. A., Bashara N. M. Ellipsometry and polarized light (North-Holland, Amsterdam, 1977);
- Ishimaru A. Wave Propagation and Scattering in Random Media. Part I: Scattering and Propagation of Waves in a Tenuous Distribution of Scatterers: Single Scattering Approximation; Part II: Transport Theory Of Waves In Randomly Distributed Scatterers (Wiley-IEEE Press, 1997).
You can recommend my answers if they are useful for you.
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