Fenghao Xu
Ph.D. Student in Applied Physics, admitted Autumn 2018
All Publications
-
A Purcell-enabled monolayer semiconductor free-space optical modulator
NATURE PHOTONICS
2023
View details for DOI 10.1038/s41566-023-01250-9
View details for Web of Science ID 001031418200001
-
Quantitative phase contrast imaging with a nonlocal angle-selective metasurface.
Nature communications
2022; 13 (1): 7848
Abstract
Phase contrast microscopy has played a central role in the development of modern biology, geology, and nanotechnology. It can visualize the structure of translucent objects that remains hidden in regular optical microscopes. The optical layout of a phase contrast microscope is based on a 4 f image processing setup and has essentially remained unchanged since its invention by Zernike in the early 1930s. Here, we propose a conceptually new approach to phase contrast imaging that harnesses the non-local optical response of a guided-mode-resonator metasurface. We highlight its benefits and demonstrate the imaging of various phase objects, including biological cells, polymeric nanostructures, and transparent metasurfaces. Our results showcase that the addition of this non-local metasurface to a conventional microscope enables quantitative phase contrast imaging with a 0.02π phase accuracy. At a high level, this work adds to the growing body of research aimed at the use of metasurfaces for analog optical computing.
View details for DOI 10.1038/s41467-022-34197-6
View details for PubMedID 36543788
View details for PubMedCentralID PMC9772391