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4 March 2019 Physical-optics modeling of diffractive/meta-lenses and their design (Conference Presentation)
Frank Wyrowski, Site Zhang, Christian Hellmann, Liangxin Yang
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Proceedings Volume 10899, Components and Packaging for Laser Systems V; 1089916 (2019) https://doi.org/10.1117/12.2509414
Event: SPIE LASE, 2019, San Francisco, California, United States
Abstract
Optical components consisting of hybrid elements (reflective, refractive and diffractive elements) are widely used in modern optical applications. Diffractive lenses as an example play an important role in imaging systems, laser-beam shaping, integration systems in optical communications, etc. Recently, due to the advances in modern fabrication technologies, meta-lenses also start to draw attention. We propose methods for the modeling and design of diffractive and meta-lenses based on the concept of the fast-physical-optics approach. A diffractive or meta-lens can be modeled as a series of structures functioning locally (e.g. local gratings) on a base interface. Each local structure introduces a certain local phase modulation, and by putting all of them together, the lens functionality can be achieved. In our approach, the rigorous Fourier modal method (FMM) is applied for the analysis of the local micro-/nanostructures, with all vectorial effects and possible higher-order effects taken into consideration; then the phase modulations can be collected for the lens function modeling. In this manner, a multi-scale simulation becomes feasible and efficient in most cases. The design of diffractive/meta-lenses follows an inverse concept—starting with a functional description of the whole lens, and then searching for suitable local structures which realize the desired phase modulation with high efficiency. Depending on the working diffraction order of the local structures, either a diffractive or a meta-lens can be constructed.
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Frank Wyrowski, Site Zhang, Christian Hellmann, and Liangxin Yang "Physical-optics modeling of diffractive/meta-lenses and their design (Conference Presentation)", Proc. SPIE 10899, Components and Packaging for Laser Systems V, 1089916 (4 March 2019); https://doi.org/10.1117/12.2509414
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KEYWORDS
Systems modeling
Optical components
Phase modulation
Imaging systems
Laser systems engineering
Lenses
Optical communications
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