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Abstract
We present a concealing method in which an anti-point spread function (APSF) is generated using binary optics, which produces a large-scale dark area in the focal region that can hide any object located within it. This result is achieved by generating two identical PSFs of opposite signs, one consisting of positive electromagnetic waves from the zero-phase region of the binary optical element and the other consisting of negative electromagnetic waves from the pi-phase region of the binary optical element.
Highlights
The radius of each belt is obtained by finding the local minimum of the light-field intensity in a 3D space near the focal region of the imaging lens
This process can be simplified by finding the local minimum with a flat response along the optical axis[18,19,20,21,22] and along the transversal direction
It is clear that the field in the focal region essentially reaches zero within 4 wavelengths
Summary
To prevent the detection of an object by a probing electromagnetic plane wave from a far-away radar system, we generate an APSF using a binary optical element and a lens, and we place an object inside this APSF. This APSF ensures that all electromagnetic waves will bypass the target that we wish to hide. The size of the APSF can be increased or decreased by changing the numerical aperture (NA) of the focusing lens
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