Abstract
A two-dimensional (2D) Fibonacci grating is used to transform evanescent waves into propagating waves for far-field super-resolution imaging. By detecting far-field intensity distributions of light field through objects in front of the 2D Fibonacci grating in free space at once, we can retrieve the image of objects with beyond λ/7 spatial resolution. We also find that the coherent illumination case can give a better resolution than incoherent illumination case by such 2D grating-assisted imaging system. The analytical results are verified by numerical simulation.
Highlights
Optical microscopy is a most popular real-time imaging tool in wide applications of life science and nanotechnology[1]
Illuminations to objects or multiple direction detections of diffraction fields[16,18]. To improve such low-speed imaging process, in this paper we present a 2D Fibonacci grating-assisted microscope for far-field super-resolution imaging in free space
We have demonstrated that a Fibonacci 2D grating can be used to transform evanescent waves into propagation waves for far-field super-resolution imaging
Summary
Optical microscopy is a most popular real-time imaging tool in wide applications of life science and nanotechnology[1]. The high spatial frequency information of objects could be carried to far-field area by such grating. By measuring the far-field light intensity distributions at once, we can reconstruct the images of sample objects with a spatial resolution beyond λ/7 through the Fourier optics method[2] and finite-difference time-domain (FDTD) numerical simulation method.
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