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.
A metamaterial perfect absorber for visible-near infrared broadband was proposed. The structure consists of four layers including reflective metal Ti layer, dielectric SiO2 layer, thin Ti layer, and the top single-sized Ti cylinder, which is named the generalized M/I/M absorber. We numerically studied the absorptivity of the absorber and achieved nearly perfect absorption via optimizing the structural parameters. Our Theoretical results show that (1) the maximum absorptivity in the high absorption window is as high as 99.96% over the wavelength range from 350~1400nm and the average absorptivity across the broadband was 98.21%. (2) this structure is insensitive to the incident angle of electromagnetic wave. We hope that such a device could be applied in solar energy absorption, thermal electronic equipment and perfect cloaking.
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