High-throughput terahertz imaging: Progress and challenges

Lying between the infrared and millimeter wave regimes, terahertz waves possess many unique properties, prompting numerous compelling imaging applications, such as non-destructive testing, security screening, biomedical diagnosis, ...

Orbital angular momentum boosts multiplexed holography

Optical holography is a powerful method for recording and reconstructing complete optical field information, including intensity and phase. It has found extensive applications in various fields, such as optical display, imaging, ...

The making of a Mona Lisa hologram

Holograms are often displayed in science fiction as colorful, life-sized projections. But what seems like the technology of the future is actually the technology of the present, and now it has been used to recreate the Mona ...

Sparse holography: A novel method for creating 3D images

Computational imaging has seen tremendous progress in the last decade. The process involves using a combination of advanced algorithms and hardware to create images that cannot otherwise be captured by traditional cameras.

Bringing angular momentum to holograms and metasurfaces

Holography, invented by Gabor, provides an approach for recording and reconstructing the complete information (i.e. intensity and phase) of the light from an object. Since its invention, holographic-related technologies have ...

Linear polarization holography

In conventional holography, the hologram is formed by recording the interference fringes of two coherent beams using a photosensitive material. The amplitude and phase information of the original signal wave can be reconstructed ...

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Holography

Holography (from the Greek ὅλος hólos, "whole" + γραφή grafē, "writing, drawing") is a technique that allows the light scattered from an object to be recorded and later reconstructed so that when an imaging system (a camera or an eye) is placed in the reconstructed beam, an image of the object will be seen even when the object is no longer present. The image changes as the position and orientation of the viewing system changes in exactly the same way as if the object were still present, thus making the image appear three-dimensional. This effect can be seen in the figure on the right where the orientation of the mouse is significantly different in the two images and its position relative to other parts of the scene has changed. The holographic recording itself is not an image – it consists of an apparently random structure of either varying intensity, density or profile – an example can be seen in Figure 4 below.

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