Focusing Electromagnetic Fields with Cascaded Circular Apertures
Abstract
Diffraction from apertures – often understood as a detrimental effect that makes the beam size larger – can be used to focus light in proper configurations. Following the theory of M. De, et al., Appl. Opt. 7, 483-488 (1968), and J. W. Y. Lit, et al., J. Opt. Soc. Am. 59, 559-567 (1969), we demonstrate such effects in VirtualLab Fusion with its flexible Fourier transform settings. In the following two examples, we show the field along z axis, analyze it on the focal plane, and compare it with the reference.
VirtualLab Fusion Configuration
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VirtualLab Fusion
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Use Case
Diffraction Patterns behind Different Apertures
With the advanced propagation technology in VirtualLab Fusion, we calculate the diffraction patterns for apertures with different shapes and study the property of diffraction.
Use Case
Pinhole Modeling in a Low-Fresnel-Number System
With the flexible Fourier transform settings in VirtualLab Fusion, we model the diffraction effect from surface apertures and pinholes in a low-Fresnel-number system.