Properties of Light

Introduction By appropriately processing the properties of light, the optimum amount of energy derived is in the form of an evanescent wave. Evanescent waves are very sensitive to multilayer photonic bandgap formation due to changes in external environment and propagation of specific electromagnetic waves. Electromagnetic (EM) waves with frequencies falling within the wavelength photonic band gap (PBG) [1, 2] can not propagate through this structure. By introducing defects in the periodic structure, localized states can be created in the PBG.

Light seems like waves and particles. The wave properties of light include the curvature of the path of the wave as it enters another material (ie, prism, rainbow, pencil in glass water, etc.) from one material (medium). Particle characteristics were confirmed by photoelectric effect. Zinc exposed to ultraviolet light becomes positively charged because light may force electrons in zinc. These electrons can generate electricity. Sodium, potassium and selenium have critical wavelengths in the visible region. The critical wavelength is the maximum (visible or invisible) wavelength that produces the photoelectric effect.

Color is a characteristic of light depending on wavelength. When light strikes an object, some of it is absorbed and some is reflected. The apparent color of an opaque object depends on the wavelength of the light it reflects; for example, the red object observed under sunlight reflects only the waves that produce red light, so it looks red I will. The color of the transparent object is determined by the wavelength of the transmitted light. Opaque objects that reflect all wavelengths are displayed in white and those that absorb all wavelengths are displayed in black. Black and white are not generally regarded as true colors and black is said to be caused by lack of color, but white is caused by color mixture of all colors.

To define the color characteristics of the light source, the lighting industry mainly focuses on two indicators, a correlated color temperature (CCT), often used as an indicator of the apparent "warm" or "cold" of the light emitted by the light source, and It depends on the color rendering index (CRI) indicating the light source. A function that makes objects appear naturally. For example, to respond to expectations for excellent color rendering in retail applications, this research proposes to use a mature CRI and another indicator called Gamut Area Index (GAI). GAI represents the relative separation of the colors of objects illuminated by the light source, the larger the GAI, the greater the apparent saturation or vividness of the object's color. Therefore, a light source with balanced CRI and GAI is generally superior to a light source with only high CRI or high GAI.