AI Article Synopsis
- - The study demonstrates a subwavelength diffraction grating that can differentiate the transverse profile of an incoming optical beam concerning a spatial variable.
- - Results match well with the analytical model, indicating that differentiation occurs during transmission when light hits the grating at an angle, linked to guided-mode resonance.
- - This technology could lead to innovative photonic devices for applications like beam shaping, optical information processing, and analog optical computing.
Article Abstract
We present an experimental demonstration of a subwavelength diffraction grating performing first-order differentiation of the transverse profile of an incident optical beam with respect to a spatial variable. The experimental results are in a good agreement with the presented analytical model suggesting that the differentiation is performed in transmission at oblique incidence and is associated with the guided-mode resonance of the grating. According to this model, the transfer function of the grating in the vicinity of the resonance is close to the transfer function of an exact differentiator. We confirm this by estimating the transfer function of the fabricated structure on the basis of the measured profiles of the incident and transmitted beams. The considered structure may find application in the design of new photonic devices for beam shaping, optical information processing, and analog optical computing.
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| http://dx.doi.org/10.1364/OE.26.010997 | DOI Listing |
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