There are a number of models to analyze propagation of light in scattering media, including ballistic, diffusion, Kublai-munk, Monte-Carlo etc. The multiple scattering resembles to be dominant in highly scattering media such as biological tissues, dense clouds, ash plume, dense aerosols and dusts even colloidal solutions and suspensions, while to my knowledge there is no perfect theory to describe multiple scattering in random media or turbid media. Can you suggest how to deal with this phenomena?
I'd recommend taking a look at the books by Ishimaru, 'Wave propagation in radom media', perhaps that will be enlightening.
http://books.google.nl/books/about/Wave_Propagation_and_Scattering_in_Rando.html?id=wAZnuHdEKL0C&redir_esc=y
In addition to the excellent book by Ishimaru, I'd recommend another one:
"Light Propagation through Biological Tissue and Other Diffusive Media: Theory, Solutions, and Software"
Author(s): Fabrizio Martelli; Samuele Del Bianco; Andrea Ismaelli; Giovanni Zaccanti
Published: 2010
DOI: 10.1117/3.824746
eISBN: 9780819481832 | Print ISBN13: 9780819476586
http://ebooks.spiedigitallibrary.org/book.aspx?bookid=83
Dear Parviz Parvin! Concerning the photon-photon interaction (you put this question) let me say something else as an addendum. (I had commented that your question, but an addendum is necessary in my view.)
Of course, what I had written, is (in my mind) correct. The only thing I forgot to mention: if you ar speaking about _direct_ interaction, the answer is "not", despite the photon-photon interaction cross sections had been measured. Let me explain what I mean.
The situation with photons is a bit different from gluons, for example. Gluons can interact with each other directly (the "first order" process); photons - only via "higher order interactions" when the interaction goes with help of vacuum fluctuations (electron-positron pairs first of all). This is because the physical vacuum is a media which produces observable effects like the Lamb shift, anomalous electron (muon) magnetic moment etc.
Direct gluon-gluon interaction was observed in experiments at LEP.
Photon-photon interaction in vacuum has an _analogy_ (with all precautions!) when two intensive laser beams meet each other in a gas, for example. In that case the atoms of the gas play a role of vacuum electron-positron fluctuations. This is also the "higher order" process.
So, in the next time, please, formulate your questions more precisely!
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Optics