Phys.org March 18, 2024 Researchers in Austria produced a sub-terahertz holographic image of a two-dimensional 576-bit data code using a diffractive phase-plate element. The phase plate was designed to encode a focused image of the data code into a phase modulation profile. The complex phase plate structure is fabricated from polylactic acid using fused deposition modeling, a common three-dimensional-printing technique. The simplified optical setup, consisted of a 0.14 THz diverging source, the holographic phase plate, and a scanning detector, without the need for additional optical elements. The information stored in the data code was an example of a cryptographic private […]
Tag Archives: Holography
Researchers devise new quantum photonics technique to create better holograms
Phys.org July 10, 2023 It is possible to observe interference between independent light sources by measuring correlations in their intensities rather than their amplitudes. An international team of researchers (Canada, UK) applied this concept of intensity interferometry to holography. They combined a signal beam with a reference and measured their intensity cross-correlations using a time-tagging single-photon camera. The correlations revealed an interference pattern from which they reconstructed the signal wavefront in both intensity and phase. They demonstrated the principle with classical and quantum light, including a single photon. Since the signal and reference do not need to be phase-stable nor […]
New holographic camera sees the unseen with high precision
Science Daily November 17, 2021 A team of researchers in the US (Northwestern University, Southern Methodist University) has invented a new method called synthetic wavelength holography. By capturing the entire light field of an object in a hologram, it is possible to reconstruct the object’s three-dimensional shape in its entirety. They captured holographic imaging around a corner or through scatterers — with synthetic waves instead of normal light waves. From there, an algorithm reconstructed the scattered light signal to reveal the hidden objects. The system could rapidly capture full-field images of large areas with submillimeter precision. To eliminate the need […]
New holographic technique opens the way for quantum computation
Eurekalert May 3, 2019 An international team of researchers (Switzerland, UK, Spain) shows that holograms of local electromagnetic fields can be obtained with combined attosecond/nanometer resolution in an ultrafast transmission electron microscope. Unlike conventional holography, where signal and reference are spatially separated and then recombined to interfere, our method relies on electromagnetic fields to split an electron wave function in a quantum coherent superposition of different energy states. In the image plane, spatial modulation of the electron energy distribution reflects the phase relation between reference and signal fields. Beyond imaging applications, this approach allows implementing quantum measurements in parallel, providing […]