We theoretically suggest ultra-sparse 1D and 2D arrays of high-index dielectric wires as broadband, omnidirectional reflectors and polarizers. Using diffraction potential arguments and numerical simulations, we show the proposed device for 1D array supports a high-extinction polarizing function. For an optimized 1D SrTiO3-wire array, a TE reflection resonance has a remarkably wide bandwidth while the TM wave almost freely passes through the array in the entire zero-order spectral domain. Based on the theoretically observed performance of the 1D array, we design fully conical omnidirectionality in the reflection for the 2D extension at the center wavelength of the fundamental-mode resonance condition. We briefly discuss possibility of the proposed 1D and 2D wire grid architectures for space-variant beam transforming optics and vector beam generations. Applications to THz photonic components and other long-wave devices such as radio-wave telescopes and satellite antenna are envisioned.
Gunpyo Kim, Jae Woong Yoon, Seok-Ho Song, and Robert Magnusson, "Wideband ominidirectional reflectors and polarizers with minimal material embodiment (Conference Presentation)," Proc. SPIE 10528, Optical Components and Materials XV, 1052818 (Presented at SPIE OPTO: January 31, 2018; Published: 14 March 2018); https://doi.org/10.1117/12.2288994.5751440633001.
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