Photonic crystals have three purchasing laser grade optical prism that can be controlled manually for different purposes. The first characteristic is that if the optical energy gap is used, the light can be blocked. This feature allows the light to be locked in a fairly small area. In the current industry, this feature is used to concentrate light in an area and make it into an integrated circuit.
Another characteristic is that the photonic crystal has an anisotropy, and the photonic crystal will scatter in many directions because the photonic crystal can appear to be transparent and opaque with the polarization angle of the light (at a certain angle, it can pass through). But there are some ways to pass through).
The third characteristic is that the curve of the photonic crystal is very complicated and varied. Because the curve of the special high precision optical lens manufacturer/supplier changes very quickly and is very irregular, as long as the wavelength changes slightly, the light entering the photonic crystal can be seen, and its angle will deviate very much. In terms of advantages, the area of ​​photonic crystals is one thousandth smaller than that of conventional integrated circuits, so, in contrast, the degree of circuit accumulation is 1,000 times larger than in the past. Another advantage is that the refractive index can be up to 1,000 times the previous one.
In addition, it is also possible to use a polarizing property to change the properties of light, and it is possible to condense the polarized light of the conventional square to one thousandth of the conventional volume. In short, what are the benefits and characteristics of photonic crystals? High accumulation, small size and low cost.
Making LEDs using photonic crystals
In addition, photonic crystals have other properties. With its characteristics, photonic crystal LEDs can be fabricated. Generally, it can be divided into two types, one is an LED, and the other is a laser diode (Laser Diode). The LD laser diode part can be divided into photonic crystal DFB laser diode (Photonic crystal DFB LD) and Photonic crystal defect LD. Photonic crystal DFB laser diodes are well-known structures, and their laser values ​​can be controlled to be emitted in very low areas. The structure of such a sub-structure is the area where the wholesale high efficiency laser grade optical filter energy gap must exist, and because of this, the structure It is more difficult to achieve commercialization.
It is relatively simple to make LEDs by using the structure of photonic crystals. The part that is often confused about photonic crystals is that they use DFB lasers, so some people think that they are using a specific period or wavelength. In fact, the answer is wrong. The reason is that the DFB laser and the photonic crystal LD ​​have limited incidence of incident and diffracted light. However, the angle of incident light and the angle of diffracted light relative to the photonic crystal are not limited. So instead of using specific cycles or wavelengths to enhance efficiency, this feature is very important for LEDs.