Surface enhanced coherent anti-Stokes Raman scattering based on Fano-type metamaterials

HE Jinna; FAN Chunzhen; DING Pei; ZHU Shuangmei; LIANG Erjun

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Surface enhanced coherent anti-Stokes Raman scattering based on Fano-type metamaterials

HE Jinna 1 #,FAN Chunzhen 1,DING Pei 2,ZHU Shuangmei 1,LIANG Erjun 1 *

1.School of Physical Science & Engineering, Zhengzhou University, Zhengzhou 450052

2.Department of Mathematics & Physics, Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou 450015

*Correspondence author

#Submitted by

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Funding: Specialized Research Fund for the Doctoral Program of Higher Education（No.20114101110003）, National Natural Science Foundations of China（No.11574276, 11404291, 11504333）

Opened online: 7 December 2015

Accepted by: none

Citation: HE Jinna,FAN Chunzhen,DING Pei.Surface enhanced coherent anti-Stokes Raman scattering based on Fano-type metamaterials[OL]. [ 7 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4666525

Surface enhanced coherent anti-Stokes Raman scattering (SECARS) is a sensitive tool and promising for single molecular detection and chemical selective imaging. However, the usually experimentally observed enhancement factors (EF) were only 10~100, many orders of magnitudes lower than predicted. In this paper, we present a design of SECARS substrate consisting of three asymmetric gold disks and strategies for maximizing the EF by engineering the near-field properties of the plasmonic Fano nanoassembly. It is found that the "hot spots" corresponding to different frequencies involved in the SECARS process can be brought to the same spatial locations by tuning incident orientations, giving rise to highly confined SECARS "hot spots" with the EF reaching a sensitivity of single-molecule detection. These findings put an important step forward to the plasmonic substrate design for SECARS as well as for other nonlinear optical processes.

Keywords:Surface enhanced coherent anti-Stokes Raman scattering; Fano resonance; near-field enhancement; metamaterials

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