Access to eBooks is limited to institutions that have purchased or currently subscribe to the SPIE eBooks program. eBooks are not available via an individual subscription. SPIE books (print and digital) may be purchased individually on SPIE.Org.

Contact your librarian to recommend SPIE eBooks for your organization.
Chapter 5:
Polarimetric Interactions: Reflection and Transmission
Abstract
This chapter introduces the formalism we need to describe the interaction of a polarized beam with a reflective or transmissive medium. To simplify the discussion, we begin in this chapter with simple optically flat surfaces and move, in Chapter 6, to consideration of the more complex surfaces that represent the surfaces we wish to remotely sense. This chapter draws on classic texts on optics and polarization [e.g., Hecht (1990) and Goldstein (2003)], to which the reader is referred for a more thorough treatment. 5.1 Fresnel Specular Reflection In Chapter 2 we introduced the concept of total reflection as the ratio of the exittance from a surface to the irradiance onto a surface and a similar term for the transmission. Fresnel (1866) showed that for radiation normally incident onto a planar dielectric surface (i.e., an optically flat surface), the reflectivity is a function only of the index of refraction of the two media and can be expressed as r=(n 2 −n 1 n 2 +n 1 ) 2 , where n 1 is the index of refraction in the medium in which the wave is propagating (often air) and n 2 is the index of refraction of the second medium (i.e., the reflecting surface). If the medium is opaque, then the remainder of the energy is absorbed (i.e., 1-r). If the medium is transmissive, the transmission through the interface is simply τ=1−r . For the more general case of radiation incident from an arbitrary angle, we must take into account the polarized nature of radiation.
Online access to SPIE eBooks is limited to subscribing institutions.
CHAPTER 5
11 PAGES


SHARE
Back to Top