Realization of broadband truly rainbow trapping in gradient-index metamaterials

Author:

Xu Jie12ORCID,Xiao Sanshui3ORCID,He Panpan4,Wang Yazhou3ORCID,Shen Yun5,Hong Lujun5ORCID,Luo Yamei12,He Bing12

Affiliation:

1. Southwest Medical University

2. Medical Engineering & Medical Informatics Integration and Transformational Medicine of Luzhou Key Laboratory

3. Technical University of Denmark

4. Luzhou Vocational and Technical College

5. Nanchang University

Abstract

Unidirectionally propagating wave (UPW) such as surface magnetoplasmon (SMP) has been a research hotspot in the last decades. In the study of the UPW, metals are usually treated as perfect electric conductors (PECs). However, it was reported that the transverse resonance condition induced by the PEC wall(s) may significantly narrow up the complete one-way propagation (COWP) band. In this paper, ultra-broadband one-way waveguides are built by utilizing the epsilon-negative (ENG) metamaterial (MM) and/or the perfect magnetic conductor (PMC) boundary. In both cases, the total bandwidth of the COWP bands are efficiently enlarged by more than three times than the one in the original metal-dielectric-semiconductor-metal structure. Moreover, the one-way waveguides consisting of gradient-index metamaterial are proposed to achieve broadband truly rainbow trapping (TRT). In the full-wave simulations, clear broadband TRT without back reflection is observed in terahertz regime. Besides, giant electric field enhancement is achieved in a PMC-based one-way structure, and the amplitude of the electric field is enormously enhanced by five orders of magnitude. Our findings are beneficial for researches on broadband terahertz communication, energy harvesting and strong-field devices.

Funder

National Natural Science Foundation of China

Department of Science and Technology of Sichuan Province

Start-up funding of Southwest Medical University

Science and Technology Strategic Cooperation Programs of Luzhou Municipal People’s Government and Southwest Medical University

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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