Year: 2018
Type: article
Abstract: Superscattering, that is, a phenomenon of the scattering cross section from a subwavelength object exceeding the single-channel limit, has important prospects in enhanced sensing/spectroscopy, solar cells, and biomedical imaging. Superscattering can be typically constructed only at a single frequency regime, and depends critically on the inescapable material losses. Under such realistic conditions, superscattering has not been predicted nor observed to exist simultaneously at multiple frequency regimes. Here we introduce multifrequency superscattering in a subwavelength hyperbolic structure, which can be made from artificial metamaterials or from naturally existing materials, such as hexagonal boron nitride (BN), and show the advantage of such hyperbolic materials for reducing structural complexity. The underlying mechanism is revealed to be the multimode resonances at multiple frequency regimes as appear in BN due to the peculiar dispersion of phonon-polaritons. Importantly, the multifrequency superscattering has a high tolerance to material losses and some structural variations, bringing the concept of multifrequency superscattering closer to useful and realistic conditions.
Source: ACS Photonics
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, Ministry of Education - Singapore, Nanyang Technological University, National Natural Science Foundation of China, Ministry of Education of the People's Republic of China, Ministry of Education, India, Materials Research Science and Engineering Center, Harvard University, Fundamental Research Funds for the Central Universities, Division of Materials Research, Natural Science Foundation of Zhejiang Province
Awards: G105361937, G1206614454, G2361169868, G2598644940, G3048563442, G318041215, G3202401936, G347520540, Graduate Research Fellowship Program, G391170236, G437536353, G4873476354, G4917416065, G5406567624, G5760841738, G6209202761, G6339488317, G6357482309, G6738855431, G7397159887, MIT Materials Research Science and Engineering Center - Full Proposal, G7596747812, G7815995946
OpenAlex ID: W2962975895