What is binary lens?
Binary diffractive lenses are surface-relief structures that are fabricated based on very large-scale integration (VLSI) lithographic techniques. The name “binary” reflects the coding scheme employed to create the sequence of photolithographic masks for fabrication.
How does diffractive lens work?
A: The Diffractive lens has a thin structure of rings on its surface, with different each ring having a tooth-like profile. Light going through the rings is delayed in a proportion to the height along the radius, creating a radial phase profile that is identical to that of a regular lens.
What is a diffractive optical element?
Diffractive elements are thin phase elements that operate by means of interference and diffraction to produce arbitrary distributions of light or to aid in the design of optical systems. RPC Photonics designs and fabricates diffractive elements with both binary and analog phase profiles.
What is Canon diffractive optics?
DO (diffractive optics) lens elements enable telephoto lenses to be lighter and more compact while maintaining a high level of performance. Canon succeeded in creating the innovative DO lenses by bonding a precise diffraction grating to the surface of a glass lens.
How many Focii are there in a zone plate?
Zone plate has one focus whereas lens has multiple focii.
How diffractive optical elements are made?
Diffractive Micro-optics Usually, micro-optic diffractive elements are made as thin plates imposing a certain spatial pattern of optical phase changes on an incident light beam, which is usually a laser beam.
How DOEs a Metalens work?
A metalens is made by depositing an array of subwavelength “pillars” of a high-index material on a flat substrate on the order of a millimeter thick, with both materials transparent at the transmitted wavelength. The pillars must be transparent and have a high refractive index at the operating wavelength.
What does do stand for in Canon lenses?
DO – diffractive optics (e.g. Canon EF 400mm f/4 DO IS II USM Lens) DO stands for Diffractive Optics and shows that a lens uses special elements to help make them more compact without compromising on quality. Good to know: These are usually differentiated by a green ring around the front of the lens.
Which lens is used in zone plate?
It is a transparent plate on which circles whose radii, proportional to the square roots of natural numbers 1, 2, 3… are drawn. The alternate annular zones thus formed are blocked. Such a plate behaves like a convex lens and produces an image of a source of light on the screen placed at a suitable distance.
How is zone plate constructed?
Unlike lenses or curved mirrors, zone plates use diffraction instead of refraction or reflection. A zone plate consists of a set of concentric rings, known as Fresnel zones, which alternate between being opaque and transparent. Light hitting the zone plate will diffract around the opaque zones.
What is a Metalens?
Metalenses are flat surfaces that use nanostructures to focus light. These simple, flat surface lenses could replace bulky, curved lenses currently used in optical devices. It uses arrays of titanium dioxide nanofins to equally focus wavelengths of light and eliminate chromatic aberration.
What are the different types of binary diffractive lenses?
Two types of the binary diffractive lenses are demon- strated. The one is the binary diffractive convex lens for focusing LED light [1,12-14] and the other is the binary diffractive concave lens for diffusing LED light. These Copyright © 2013 SciRes.
How to improve the efficiency of binary diffractive convex lenses?
In the case of the binary diffractive convex lens with 2-mm focal length, it is pos- sible to control the luminous intensity distribution. To improve the diffraction efficiency and realize a thin LED light source, the binary diffractive lenses with 100-μm-order focal length are effective.
What is the difference between binary convex lens and binary concave lens?
The one is the binary diffractive convex lens for focusing LED light [1,12-14] and the other is the binary diffractive concave lens for diffusing LED light. These Copyright © 2013 SciRes. OPJ
What is the wavelength of light produced by binary diffractive concave lenses?
The binary diffractive concave lens fabricated in this study can be used to broadly disperse 532 nm light and produces the same effect as a refractive concave lens. For white-light LEDs, we chose a design wavelength of 555 nm.