This feature article reviews recent developments in optical HRIPs and their typical applications in high-tech fields. Therefore, research of HRIPs is becoming an interdisciplinary subject. Besides the refractive index, optical dispersion (Abbe number), birefringence and optical transparency are often involved in designing HRIPs for practical optical fabrications. Incorporation of high- nnanoparticles into polymers seems to be a more promising strategy to achieve a refractive index higher than 1.80 however, the obtained organic–inorganic hybrid materials sometimes suffer from poor storage stability, higher optical loss and poor processability. Relevant Papers A Deep Learning Solvent-Selection Paradigm Powered by a Massive Solvent/Nonsolvent Database for Polymers Refractive index prediction models. However, their upper n limitation is usually below 1.80. The common THz optical component materials high-density polyethylene, polytetrafluoroethylene, polyimide (Kapton), and polyethylene cyclic olefin copolymer (Topas) were evaluated for broadband THz applications. For intrinsic HRIPs, aromatic rings, sulfur-containing groups, halogens except fluorine and organometallic moieties are often utilized to increase their refractive indices. We report broad bandwidth, 0.110 THz time-domain spectroscopy of linear and electro-optic polymers. High refractive indices have been achieved either by introducing substituents with high molar refractions to make intrinsic HRIPs or by combining high- nnanoparticles with polymer matrixes to make HRIP nanocomposites. Rapid developments in advanced photonic devices have led to the increasing exploration of high refractive index (high- n) materials, particularly high-refractive-index polymers (HRIP).
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