Phys.org March 25, 2024 Despite real-time femtophotography advantages over conventional multi-shot approaches, existing techniques confront restricted imaging speed or degraded data quality by the deployed optoelectronic devices application scope, acquisition accuracy, and hindered by the limitations in the acquirable information imposed by the sensing models. An international team of researchers (Canada, France) overcame these challenges by developing swept coded aperture real-time femtophotography (SCARF). This enables all-optical ultrafast sweeping of a static coded aperture during the recording of an ultrafast event, bringing full sequence encoding of up to 156.3 THz to every pixel on a CCD camera. They demonstrated SCARF’s single-shot ultrafast […]
Tag Archives: Optical imaging
Physicists Discover a New Way to ‘See’ Objects Without Looking at Them
Science Alert December 29, 2022 Instead of lasers and mirrors, researchers in Finland proposed the concept of coherent interaction-free detection and demonstrated it experimentally using a three-level superconducting transmon circuit to detect an electromagnetic wave pulsed into a chamber. They showed that it is possible to ascertain the presence of a microwave pulse resonant with the second transition of the transmon, while at the same time avoid exciting the device onto the third level. Experimentally, this was done by using a series of Ramsey microwave pulses coupled into the first transition and monitoring the ground-state population. The protocol can be […]
Overcoming the optical resolution limit
Phys.org November 1, 2022 When measuring with light, the lateral extent of the structures that can be resolved by an optical imaging system is fundamentally diffraction limited. Researchers in Germany have developed an approach that uses microspheres placed directly on the surface of the object to extend the limits of interferometric topography measurements for optical resolution of small structures. They identified microspheres and photonic nanojets to explain the resolution enhancement. They extended the model with respect to microsphere-assisted interference microscopy providing a rigorous simulation of the scattered electric field directly above the sphere. Simulation and experimental results were compared in […]