The diffractive elements operate with interference and diffraction that help produce distributed light that is arbitrary. It is considered a thin phase and helps to aid the operating system designs.
The diffractive optics are the optics in micro size and fabricated with the relief structure to resemble the steps. The integrated circuits and lithographic techniques are used to make these elements. These elements have advanced the efficiencies to around 80%, neglecting all the surface losses. These elements are also cost-efficient and have a size quite tiny for the fabrication, and have a centrosymmetric pattern, making it a brilliant design.
RPC photonics design helps to produce analog and continuous phase elements. These elements have an efficiency of 90% without the losses produce many more general pattern designs.
Various Kind Of Diffraction Or Binary Elements:
There are various types of elements used in diffraction optics. Let us discuss them. Here are the following elements you must know:
Diffractive lens – It helps you to lessen the number of elements in the conventional lens system. It is considered to have a thin layer of λ/(n – 1), where the λ is the operating wavelength and n is the index of refraction. It consists of zones that are fine at the edges of the lenses.
Beam Splitter – The beam splitter is another diffractive element that can split the beam light into a spot array. When the beam is incident on the beam splitter that split the elements into spot arrays that can be one dimensional or two dimensional.
Diffusers – it helps to provide illumination that can be controlled used for an application like the lithographic illumination system. It also gives the high-intensity fall-off wider than the limited diffraction spot, which corresponds to incident beam light size at the wavelength.
Corrector Plates – It can be used to correct the wavefront by inducing the phase delay. It also helps in high accuracy.
These are some of the diffraction elements used you should know. They develop many designs and modeling codes that improve performance by optimizing the various binary elements. The only issue is calculating the binary element surface structure provided the expected intensity distribution in the image plane. These are quite crucial things you must study in diffraction optics.