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Title: Nonlinearity in the Dark: Broadband Terahertz Generation with Extremely High Efficiency

Abstract

Plasmonic metamaterials and metasurfaces offer new opportunities in developing high performance terahertz emitters and detectors beyond the limitations of conventional nonlinear materials. However, simple meta-atoms for second-order nonlinear applications encounter fundamental trade-offs in the necessary symmetry breaking and local-field enhancement due to radiation damping that is inherent to the operating resonant mode and cannot be controlled separately. Here we present a novel concept that eliminates this restriction obstructing the improvement of terahertz generation efficiency in nonlinear metasurfaces based on metallic nanoresonators. This is achieved by combining a resonant dark-state metasurface, which locally drives nonlinear nanoresonators in the near field, with a specific spatial symmetry that enables destructive interference of the radiating linear moments of the nanoresonators, and perfect absorption via simultaneous electric and magnetic critical coupling of the pump radiation to the dark mode. Our proposal allows eliminating linear radiation damping, while maintaining constructive interference and effective radiation of the nonlinear components. We numerically demonstrate a giant second-order nonlinear susceptibility ~10 –11 m/V, a one order improvement compared with the previously reported split-ring-resonator metasurface, and correspondingly, a 2 orders of magnitude enhanced terahertz energy extraction should be expected with our configuration under the same conditions. Here, our study offers amore » paradigm of high efficiency tunable nonlinear metadevices and paves the way to revolutionary terahertz technologies and optoelectronic nanocircuitry.« less

Authors:
 [1];  [2];  [3];  [4];  [2];  [5]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States); Anhui Univ., Hefei (China)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  3. Zhejiang Univ., Hangzhou (China)
  4. Anhui Univ., Hefei (China)
  5. Ames Lab. and Iowa State Univ., Ames, IA (United States); Institute of Electronic Structure and Lasers (IESL), Crete (Greece)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1494937
Alternate Identifier(s):
OSTI ID: 1491286
Report Number(s):
IS-J-9877
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:  
AC02-07CH11358; 320081; 61601166; 61701001; 61701003; 61722101; KJ2017ZD51; KJ2017ZD02
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 2; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Fang, Ming, Shen, Nian -Hai, Sha, Wei E. I., Huang, Zhixiang, Koschny, Thomas, and Soukoulis, Costas M. Nonlinearity in the Dark: Broadband Terahertz Generation with Extremely High Efficiency. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.122.027401.
Fang, Ming, Shen, Nian -Hai, Sha, Wei E. I., Huang, Zhixiang, Koschny, Thomas, & Soukoulis, Costas M. Nonlinearity in the Dark: Broadband Terahertz Generation with Extremely High Efficiency. United States. doi:10.1103/PhysRevLett.122.027401.
Fang, Ming, Shen, Nian -Hai, Sha, Wei E. I., Huang, Zhixiang, Koschny, Thomas, and Soukoulis, Costas M. Fri . "Nonlinearity in the Dark: Broadband Terahertz Generation with Extremely High Efficiency". United States. doi:10.1103/PhysRevLett.122.027401.
@article{osti_1494937,
title = {Nonlinearity in the Dark: Broadband Terahertz Generation with Extremely High Efficiency},
author = {Fang, Ming and Shen, Nian -Hai and Sha, Wei E. I. and Huang, Zhixiang and Koschny, Thomas and Soukoulis, Costas M.},
abstractNote = {Plasmonic metamaterials and metasurfaces offer new opportunities in developing high performance terahertz emitters and detectors beyond the limitations of conventional nonlinear materials. However, simple meta-atoms for second-order nonlinear applications encounter fundamental trade-offs in the necessary symmetry breaking and local-field enhancement due to radiation damping that is inherent to the operating resonant mode and cannot be controlled separately. Here we present a novel concept that eliminates this restriction obstructing the improvement of terahertz generation efficiency in nonlinear metasurfaces based on metallic nanoresonators. This is achieved by combining a resonant dark-state metasurface, which locally drives nonlinear nanoresonators in the near field, with a specific spatial symmetry that enables destructive interference of the radiating linear moments of the nanoresonators, and perfect absorption via simultaneous electric and magnetic critical coupling of the pump radiation to the dark mode. Our proposal allows eliminating linear radiation damping, while maintaining constructive interference and effective radiation of the nonlinear components. We numerically demonstrate a giant second-order nonlinear susceptibility ~10–11 m/V, a one order improvement compared with the previously reported split-ring-resonator metasurface, and correspondingly, a 2 orders of magnitude enhanced terahertz energy extraction should be expected with our configuration under the same conditions. Here, our study offers a paradigm of high efficiency tunable nonlinear metadevices and paves the way to revolutionary terahertz technologies and optoelectronic nanocircuitry.},
doi = {10.1103/PhysRevLett.122.027401},
journal = {Physical Review Letters},
number = 2,
volume = 122,
place = {United States},
year = {2019},
month = {1}
}

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