Experiment Polarization, wave plates and LCD

Subjects discussed :
- Law of Malus
- Delay of a wave
- Production and analysis of polarized light
- Liquid crystal display

Principles and objectives:
The acronym LCD stands for Liquid Crystal Display and refers to a liquid crystal display.
It is easy to act on the structure of liquid crystals, in particular by applying an electric field. The alignment of the liquid crystal molecules is then constrained, which has the effect of modifying the optical properties of the latter, in particular its polarization. The operating principle is simple, in the absence of an electric field the molecules orient themselves naturally (twist effect) and the substance will be perfectly transparent. On the other hand, the action of an electric field creates a modification of the environment and the substance darkens.

Composition:
▪ 1 prism bench of 2 m with adjustable feet set (ref.202233)
 ▪ 7 standard prism carriers (ref.202234)
 ▪ 1 cold white LED lantern (ref.204277)
 ▪ 2 polarizers in graduated mount (ref.202374)
 ▪ 1 half-wave plate in graduated mount (ref.202376)
 ▪ 1 quarter-wave plate in graduated mount (ref.202378)
 ▪ 1 LCD system by transmission (ref.202884)
 ▪ 1 luxmeter on rod (ref.210010)
 ▪ 1 focusing lens (ref.202275) in mount (ref.202241)
▪  1 green Paton filter (ref.202361) and its mount on rod (ref.202242)
 ▪ 1 white metal screen with grid 20x20 cm (ref.202368)
 ▪ 1 experiment manual