The Origin Of The Polarizer

Slightly explain:

polarized light:

Human understanding of light can be divided into four important stages:

1. In the seventeenth century, Newton first began a systematic study of light. He discovered that the so-called white light is a mixture of all colored lights. In order to explain this phenomenon, there are many different theories derived.

2. At the beginning of the 19th century, Thomas Young successfully explained most of the optical phenomena such as reflection, refraction and diffraction using wave theory.

3. In 1873, Maxwell discovered that the light wave is an electromagnetic wave, in which the electric wave and the magnetic wave are inseparable and cannot be separated. The electric field (E), the magnetic field (H) and the direction (k) of the electromagnetic wave are mutually Vertical relationship.

4. At the beginning of the twentieth century, Einstein discovered that the energy of light could be explained by the theory of particles, and thus derived from quantum science. In other words, light has both wave and particle characteristics.

Because the theory of polarized light is explained by wave theory, the discussion in the past has regarded light as electromagnetic waves, and for the sake of simplicity, we only consider the electric field vector E. The unpolarized E can be represented by Figure 2. Many of the symmetrically equal lengths of radiation in Figure 2 indicate that E vibrates in the plane formed by E, H, and the chances of vibration in all directions are equal. When E is unevenly distributed, it is called Polarization. As shown in Figure 3, it is partially polarized. When E vibrates in only one direction, it is called linearly polarized light. From the vector point of view, when the vectors in each direction in Fig. 2 are projected onto two mutually perpendicular coordinate axes of X and Y, the unpolarized light can be decomposed into two perpendicular linearly polarized lights.