Helical Piles Research Articles

Some electromagnetic fields in Reusch piles. II. Piles at normal incidence by monochromatic, plane and uniform waves

Proposes a formalism which allows one to consider the whole reflected waves at the interfaces of an helical pile of transparent plates with rectilinear birefringence (Reusch pile). This formalism is applied to a half infinite pile, illuminated in the direction of the screw axis by monochromatic plane and uniform waves. The existence, in the pile, of iterative vibrations (some of evanescent type) is discussed. When the plates are thin enough iterative vibrations coincide with the favoured waves which exist in twisted mesomorphic phases. Existence of multi-domains of selective reflexion is predicted. Some possibilities for their observation in materials different from twisted mesophases are mentioned.