Shrinking endoscopes with meta-optical fibers

Ultra-compact, agile endoscopes with a large field of view (FoV), long depth of field (DoF), and short rigid tip length are essential for developing minimally invasive operations and new experimental surgeries. As these fields ...

Study proposes achromatic metalens with varifocal performance

Metalenses, comprising one of the most prominent applications of metasurfaces, demonstrate promising abilities to replace traditional lenses. By manipulating the phase distribution of metalenses composed of appropriately ...

Liquid crystal integrated metalens for versatile color focus

The development of metasurfaces opened a horizon for the advance of planar optics. Among metadevices, the metalens has attracted widespread attention for practical applications in imaging and spectroscopy, as it provides ...

Driven to diffraction

As anyone with an interest in photography will know, to get features such as a powerful zoom, you usually need a big camera. The reason is that most cameras rely on refraction, whereby the light passing through lenses slows ...

Forging a photo is easy, but how do you spot a fake?

Faking photographs is not a new phenomenon. The Cottingley Fairies seemed convincing to some in 1917, just as the images recently broadcast on Russian television, purporting to be satellite images showing the MH17 airliner ...

Novel zoom objective with deformable mirrors

Unmanned aerial vehicles UAVs deployed on landscape analysis missions carry optical measuring equipment that is required to operate free of chromatic aberration. Researchers have now designed an all-reflective zoom objective ...

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