A standard spatial Fresnel lens (IMAGE) University of Warsaw, Faculty of Physics Caption Dr. Filip Sosnicki with a standard spatial Fresnel lens. Its temporal analogue was used in the conducted research (photo: Mirosław Kazmierczak, source: University of Warsaw). Credit Photo: Mirosław Kazmierczak, source: University of Warsaw Usage Restrictions It is permissable to make use of image provided the source and the author is quoted. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.