Highlighting and dissecting photonics research, one post at a time.
You can’t see objects through a wall, but imagine you can see around a corner, or maybe two. While this has been demonstrated with pulsed lasers and ranging experiments, imagine instead using walls as mirrors and just looking. It may sound far-fetched, but a team led by Aristide Dogariu at CREOL at the University of Central Florida has shown that it can be done by imaging the spatial coherence of reflected light from a wall.
Optical coherence tomography (OCT) is a non-invasive three-dimensional clinical imaging method that uses a coherent light source, a laser, to image different depths into tissue. However, speckle noise – an imaging artifact due to scattering and interference of coherent light – has been unavoidable and has limited the capabilities of OCT. Now, at team led by Adam de la Zerda at Stanford University has implemented a clever trick to remove speckle noise, opening up the full diagnostic potential of OCT.
Holograms reproduce both the intensity and phase of recorded light; therefore, unlike traditional photographs, holograms have the potential to faithfully reproduce a full three-dimensional scene. Continue reading “Flat Holography”
To image deep into biological tissue, two-photon microscopy has become a standard. Two-photon microscopy uses the non-linear absorption of a fluorescent molecule to simultaneously absorb two lower-energy photons as though they were one. But what is the potential for imaging with three-photons? Continue reading “1, 2, 3 Photons”
Photon Report 