Hyperbolic Meta-Materials (HMMs) are anisotropic materials with permittivity tensor that has both positive and negative eigenvalues. Here we report that by using a type II HMM as cladding material, a waveguide which only supports higher order modes can be achieved, while the lower order modes become leaky and are absorbed in the HMM cladding. This counter-intuitive property can lead to novel application in optical communication and photonic integrated circuit. The loss in our HMM-Insulator-HMM (HIH) waveguide is smaller than that of similar guided mode in a Metal-Insulator-Metal (MIM) waveguide.
Ying Tang, Zheng Xi, Man Xu, Aurèle J. L. Adam, and H. Paul Urbach, "Spatial mode filter with hyperbolic-cladded waveguide," Proc. SPIE 10112, Photonic and Phononic Properties of Engineered Nanostructures VII, 101120E (Presented at SPIE OPTO: January 31, 2017; Published: 20 February 2017); https://doi.org/10.1117/12.2250027.
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