High-efficiency mid-infrared transmissive Huygens dielectric metasurface

Ruirui Song; Wenbin Li; Qinling Deng; Shaolin Zhou

doi:10.1117/12.2604930

13 December 2021 High-efficiency mid-infrared transmissive Huygens dielectric metasurface

Ruirui Song, Wenbin Li, Qinling Deng, Shaolin Zhou

Proceedings Volume 12072, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Micro- and Nano-Optics, Catenary Optics, and Subwavelength Electromagnetics; 1207203 (2021) https://doi.org/10.1117/12.2604930
Event: Tenth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2021), 2021, Chengdu, China

Abstract

Over the past decade, major progress in emerging mid-infrared (IR) sources and detectors leads to increased interests for various IR-based applications, such as trace-gas detection, biological and medical sensing, and environmental monitoring. However, a limiting factor in the middle and long wave IR range is the lack of suitable materials that are transparent, low cost, lightweight and easy to fabricate. Here, we numerically demonstrate the artificially constructed Huygens meta-surface with versatile mid-IR wavefront control, by hybridizing the dielectric meta-atoms of high-permittivity chalcogenide on fluoride substrates. Based on the double-elements Huygens meta-atom design for linear phase tuning, transmission is enhanced substantially with high-efficiency (85%) by concentrating beam propagation into the first diffraction order similar as traditional blazed grating but with ultra-thin thickness (λ/8). Further, based on centrosymmetric deflection to produce a local and highly focused propagation mode, a Bessel beam generator is demonstrated (λ=5.22 μm, NA = 0.5) by coding a well-defined phase map into dielectric meta-atoms. As a result, the proposed dielectric metasurface with nanometer level thickness shows great prospects in the field of integrated photonics.

Citation Download Citation

Ruirui Song, Wenbin Li, Qinling Deng, and Shaolin Zhou "High-efficiency mid-infrared transmissive Huygens dielectric metasurface", Proc. SPIE 12072, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Micro- and Nano-Optics, Catenary Optics, and Subwavelength Electromagnetics, 1207203 (13 December 2021); https://doi.org/10.1117/12.2604930

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KEYWORDS

Dielectrics

Mid-IR

Diffraction

Bessel beams

Infrared sensors

Phase modulation

Beam propagation method

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