Journal
OPTICS EXPRESS
Volume 22, Issue 22, Pages 27001-27006Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.027001
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Funding
- National Natural Science Foundation of China [61176084, 11174282, 61475191, 61405243, 11404388, 61275062, 11304375, 61475188]
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A novel array of slits design combining the nano-slit grating and dielectric-metal is proposed to obtain giant and tunable electric field enhancement in the terahertz regime. The maximum amplitude of electric field is more than 6000 times larger than that of the incident electric field. It is found that the enhancement depends primarily on the stripe and nano-slits width of grating, as well as the thickness of spacer layer. This property is particularly beneficial for the realization of ultra-sensitive nanoparticles detection and nonlinear optics in the terahertz range, such as the second harmonic generation (SHG). (C) 2014 Optical Society of America
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