Dear Rahul Sharma , a Raman polar plot such as the one provided in your image shows the variation of the Raman signal of a Raman mode with the angle of polarization of the excitation source used. Normally this is done for linear polarization.

Your polar plot shows the behaviour of the two main Raman modes of MoS2, A1g and E2g , and as the graph shows they have a different behaviour or response to the polarization of the excitation source.

To read this Raman polar plot it could be useful to print the data in a cartesian graph, with Y= Intensity and X= polarization angle. If you do so, you will see that the E2g mode (black line) shows a sinusoidal like appearance with a maximum intensity at around 90º and 270º and minimums at 0º and 180º. If you represent the cartesian plot of A1g (red line), it will show a more complex pattern with maximum intensities at around 75º and 255º, and therefore dephased around 15º from the max intensities of E2g (which is true also for the minimums). Additionally the cartesian plot of A1g shows a couple of local maximums at 150º and 330º.

This means that theses two Raman modes of MoS2, A1g and E2g, show a different variation of intensity with the variation of polarization angle.

You could be interested in maximizing the Raman signal of both modes, and to do so you should choose the polarization angle which provides the best balance between the response of both modes. If their plots were not dephased the angle would be the one which in both modes corresponds to the max intensity. In your case these maximums are dephased around 15º, so the angle of polarization that maximized simultaneously both modes would be where the plots cut each other, in your case around 82.5º. You could also want to enhance the signal of just one of the modes, so you must use a polarization angle corresponding to its max intensity.

Hope it helps. Good luck with your research work.

Why the Raman spectrum of MoS2 is polarization dependent?

Dear Manuel Gómez, thank you for your answer, but the polarization angle in my graph is not for the incident light but for the analyzer, as I mentioned in the question itself. I want to know what information the reflected light will provide when passed through an analyzer with different angles.