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Broadband Electromagnetic Wave Tunneling with Transmuted Material Singularity
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- Liu, Yichao (författare)
- Taiyuan Univ Technol, Coll Phys & Optoelect, Minist Educ & Shanxi Prov, Key Lab Adv Transducers & Intelligent Control Sys, Taiyuan 030024, Peoples R China.
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- Sun, Fei (författare)
- Taiyuan Univ Technol, Coll Phys & Optoelect, Minist Educ & Shanxi Prov, Key Lab Adv Transducers & Intelligent Control Sys, Taiyuan 030024, Peoples R China.
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- Yang, Yibiao (författare)
- Taiyuan Univ Technol, Coll Phys & Optoelect, Minist Educ & Shanxi Prov, Key Lab Adv Transducers & Intelligent Control Sys, Taiyuan 030024, Peoples R China.
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- Taiyuan Univ Technol, Coll Phys & Optoelect, Minist Educ & Shanxi Prov, Key Lab Adv Transducers & Intelligent Control Sys, Taiyuan 030024, Peoples R China Elektroteknisk teori och konstruktion (creator_code:org_t)
- American Physical Society (APS), 2020
- 2020
- Engelska.
- Ingår i: Physical Review Letters. - : American Physical Society (APS). - 0031-9007 .- 1079-7114. ; 125:20
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
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- Subwavelength channels filled with near-zero-index (NZI) media can realize extraordinary optical functionalities, for example, tunneling electromagnetic wave without reflections, but usually confined in a narrow wavelength band due to the material singularity (refractive index n approximate to 0), which seriously limits the practical potentials. In this Letter, we show this limit can be fundamentally overcome by an alternative, named near-zero-index-featured (NZIF) structure, with the singularity transmuted via a controlled optical conformal mapping, enabling the device implementation with nonmagnetic normal dielectrics (i.e., relative permittivity >1). Their equivalence is strictly examined through a subwavelength tunneling waveguide. Classic wave tunneling features in a broad frequency range are revealed in various confined geometries. These properties are robust against the disturbance of several kinds of structural defects benefited from the infinite effective local wavelength. The broadband and lossless NZIF medium proposed here provides a promising way to pursue the fascinating light controlling functionalities as initially enabled by singular NZI materials.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
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- Liu, Yichao
- Sun, Fei
- Yang, Yibiao
- Chen, Zhihui
- Zhang, Jianzhong
- He, Sailing
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- Ma, Yungui
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