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New research from QuantIC published in leading photonics journals

QuantIC had an early Christmas present in Dec last year when it had two new research papers published in leading photonics journals, Nature Photonics and Optica.
“Detection and tracking of moving objects hidden from view” (Gariepy, G, Tonolini, F, Henderson, R, Leach, J and Faccio, D) was featured in Nature Photonics and highlighted the development of a camera system that can see around walls and locate hidden objects with centimetre precision and then track their movement in real time. The system combines two pieces of equipment: a laser and a single-photon avalanche diode (SPAD) camera, which captures 20 billion frames per second. The team has been able to detect objects behind walls and then track their movements within seconds. Previously, tracking movement was not possible.

HW_Light Around Corners

Professor Daniele Faccio from Heriot-Watt University said, “The ability to detect the3D shape of static, hidden objects has been demonstrated before, but the long acquisition time required by existing methods meant locating and monitoring the objects was a major challenge. We can now track hidden objects in real time and we’re still making discoveries about how the light identifies the objects, and can picture them in considerable detail.”

Rescue missions, negotiating dangerous terrain and in-car systems that help avoid collisions are some of the real-life applications the team are exploring with this breakthrough technology.

Read the paper in full here:

Check out video footage of the technology in action here:

Over at the University of Glasgow, “Photon-sparse microscopy: Visible light imaging using infrared illumination” (Aspden, R, Gemmell, N, Morris, P, Tasca, D, Mertens, L, Tanner, M, Kirkwood, R, Ruggeri, A, Tosi, A, Boyd, R, Buller, G, Hadfield, R and Padgett, M) was published in Optic and introduced a new wavelength transforming ghost imaging technique.

Conventional imaging systems rely upon illumination light that is scattered or transmitted by the object and subsequently imaged. Ghost imaging systems based on parametric down-conversion use twin beams of position-correlated signal and idler photons.  One beam illuminates an object while the image information is recovered from a second beam that has never interacted with the object.

In their research, QuantIC’s researchers used a camera-based ghost imaging system where the correlated photons had significantly different wavelengths but still allowed the irradiation of an object with low energy, infrared photons whilst still making use of a visible wavelength, highly sensitive camera.

Photon Imaging

Professor Miles Padgett said, “To the best of our knowledge, this is the first time ghost imaging has been performed with such a large ratio between signal and idler wavelength and certainly the first time that this has been combined with an array type detector. The ability to translate the image information from infrared to visible wavelengths has potential for imaging light-sensitive specimens or where covert operation is desired.”

Read the paper in full here: