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A thin hologram [1]: Section 4.1 is one where the thickness of the recording medium is much less than the spacing of the interference fringes which make up the holographic recording. The thickness of a thin hologram can be down to 60 nm by using a topological insulator material Sb 2 Te 3 thin film. [9]
In general usage, a hologram is a recording of any type of wavefront in the form of an interference pattern. It can be created by capturing light from a real scene, or it can be generated by a computer, in which case it is known as a computer-generated hologram, which can show virtual objects or scenes.
Billing itself as the world’s “first holographic communications platform,” US startup Proto is beaming life-size, “3D” video into universities, hotels and medical centers.
It involves generating holographic interference patterns. A computer-generated hologram can be displayed on a dynamic holographic display, or it can be printed onto a mask or film using lithography. [1] When a hologram is printed onto a mask or film, it is then illuminated by a coherent light source to display the holographic images.
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This explains why scratch hologram images are subject to distracting distortions and collapse of the depth image outside of a very narrow field of view --- circular arcs are a fairly poor approximation to rainbow hologram fringes. Beaty also pointed out that the rainbow hologram of a single point is a rectangular section of nested parabolics. [5]
You can now turn your old smartphone into a hologram because the future
This hologram is a transmission hologram, where the hologram is illuminated on one side, and viewed from the other. Illumination and viewing can be done from the same side if the hologram is mounted onto a reflective surface. Mass replication of such holograms can be done using an embossing process. [3]