Open Access Publication of the Month – Dennis Scheidt (INM-1) and Pedro Quinto-Su (UNAM-ICN)
13 January 2025
To encourage us all to broaden our horizons, each month the Central Library selects one open access publication from the JuSER publications portal to be featured in the newsletter of Forschungszentrum Jülich.
In this month’s open access publication, Dennis Scheidt (INM-1) and Pedro Quinto-Su (National Autonomous University of Mexico, Nuclear Sciences Institute) write about aberrations that occur in single-pixel imaging using coherent laser light.
In contrast to image acquisition with cameras, where the image is generated via the spatial arrangement of multiple sensors (pixels), in single-pixel imaging the spatial information is encoded in the structure of the measured light, meaning that a single, large-area sensor is sufficient to capture an image. To do this, a structured laser is used to illuminate an object and the reflected light is focused onto a photodiode. Single-pixel imaging enables very fast image acquisition that is independent of wavelength and therefore offers a cost-effective alternative to special cameras.
Through simulations and experiments, the authors show that the captured images can show errors caused by optical elements or turbulence when the size of the sensor is smaller than the area of the focus of the light source. Since lasers are coherent light sources, the smallest changes in the phase of the light (e.g. a twisted lens) cause an increase in the focus area due to interference effects. If the sensor is smaller than the focus, this interference signal is also recorded. Applications with very fast detectors must therefore use optics to adjust the size of the focus to the sensor, because fast sensors are usually very small.
The open access publication entitled “Errors in single pixel laser imaging emerging from spatial size limits in the bucket detector” was published in the Journal of Optics.
JuSER publications portal – Errors in single pixel laser imaging emerging from spatial size limits in the bucket detector
Forschungszentrum Jülich – Central Library (ZB) – Open Access
National Autonomous University of Mexico (UNAM) – Nuclear Sciences Institute (ICN) – About