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Title: Doubly enhanced second harmonic generation through structural and epsilon-near-zero resonances in TiN nanostructures
Authors: Wen, Xinglin
Li, Guangyuan
Gu, Chengyan
Zhao, Jiaxin
Wang, Shijie
Jiang, Chunping
Palomba, Stefano
Martijn de Sterke, C.
Xiong, Qihua
Keywords: Science::Physics
Issue Date: 2018
Source: Wen, X., Li, G., Gu, C., Zhao, J., Wang, S., Jiang, C., . . . Xiong, Q. (2018). Doubly enhanced second harmonic generation through structural and epsilon-near-zero resonances in TiN nanostructures. ACS Photonics, 5(6), 2087-2093. doi:10.1021/acsphotonics.8b00419
Journal: ACS Photonics
Abstract: Enhancing the nonlinear frequency conversion efficiency at the nanoscale is important for on-chip communication, information processing and sensing. Plasmonic nanostructures can significantly enhance the nonlinear signal due to localized surface plasmon (LSP) resonance, that is, localized electric field enhancements. Ideally, a double resonance occurs, in which both the excitation and the harmonic wavelengths are enhanced, but this is restricted by the available modes. It has been recently shown that thin films of epsilon-near-zero (ENZ) materials can also enhance optical nonlinear effects if excited at the ENZ wavelength. Here, we report the first demonstration of a new mechanism to enhance the second harmonic generation (SHG), combining a structural LSP resonance at the fundamental frequency, and the material ENZ resonance at the second harmonic frequency. We show that when both resonances are present, the SHG is substantially enhanced. With its refractory nature and CMOS compatibility, our results show considerable promise for TiN micro and nanostructures in integrated on-chip nonlinear optical devices.
ISSN: 2330-4022
DOI: 10.1021/acsphotonics.8b00419
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
Organisations: NOVITAS, Nanoelectronics Centre of Excellence
MajuLab, CNRS-UCA-SU-NUS-NTU International Joint Research Unit
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Photonics, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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