Journal
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
Volume 23, Issue 1, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2016.2537267
Keywords
Dispersion engineering; graphene; Mie scattering theory; superscatterers
Categories
Funding
- National Natural Science Foundation of China [61322501, 61574127, 61275183]
- National Program for Special Support of Top-Notch Young Professionals
- Program for New Century Excellent Talents in University [NCET-12-0489]
- Fundamental Research Funds for the Central Universities
- Innovation Joint Research Center for Cyber-Physical-Society System
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The energy-momentum dispersion relation is a fundamental property of plasmonic systems. In this paper, we show that the method of dispersion engineering can be used for the design of ultracompact graphene-based superscatterers. Based on the Bohr model, the dispersion relation of the equivalent planar waveguide is engineered to enhance the scattering cross section of a dielectric cylinder. Bohr conditions with different orders are fulfilled in multiple dispersion curves at the same resonant frequency. Thus, the resonance peaks from the first-and second-order scattering terms are overlapped in the deep-subwavelength scale by delicately tuning the gap thickness between two graphene layers. Using this ultracompact graphene-based superscatterer, the scattering cross section of the dielectric cylinder can be enhanced by five orders of magnitude.
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