
1.School of Engineering and Information Technology, University of New South Wales, Canberra, ACT, 2600, Australia
2.Nonlinear Physics Centre, The Australian National University, Canberra, ACT, 2601, Australia
3.Department of Physics, Politecnico di Milano, Piazza Leonardo Da Vinci 32, 20133, Milan, Italy
4.Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, Albert-Einstein-Str. 15, 07745, Jena, Germany
5.The MOE Key Laboratory of Weak Light Nonlinear Photonics, School of Physics and TEDA Applied Physics Institute, Nankai University, Tianjin, 300457, China
Dragomir Neshev (Dragomir.Neshev@anu.edu.au)
Andrey E. Miroshnichenko (Andrey.Miroshnichenko@unsw.edu.au)
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Xu, L. et al. Boosting third-harmonic generation by a mirror-enhanced anapole resonator. Light: Science & Applications, 7, 430-437 (2018).
Xu, L. et al. Boosting third-harmonic generation by a mirror-enhanced anapole resonator. Light: Science & Applications, 7, 430-437 (2018). DOI: 10.1038/s41377-018-0051-8.
We demonstrate that a dielectric anapole resonator on a metallic mirror can enhance the third harmonic emission by two orders of magnitude compared to a typical anapole resonator on an insulator substrate. By employing a gold mirror under a silicon nanodisk, we introduce a novel characteristic of the anapole mode through the spatial overlap of resonantly excited Cartesian electric and toroidal dipole modes. This is a remarkable improvement on the early demonstrations of the anapole mode in which the electric and toroidal modes interfere off-resonantly. Therefore, our system produces a significant near-field enhancement, facilitating the nonlinear process. Moreover, the mirror surface boosts the nonlinear emission via the free-charge oscillations within the interface, equivalent to producing a mirror image of the nonlinear source and the pump beneath the interface. We found that these improvements result in an extremely high experimentally obtained efficiency of 0.01%.
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