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Enhanced Second Harmonic Generation by Mode Matching in Gain-assisted Double-plasmonic Resonance Nanostructure
Gui-Ming Pan1, Da-Jie Yang1,2, Li Zhou3
1Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan, 430072, P.R. China.
Scientific Reports
|August 31, 2017
Summary
This study enhances second harmonic generation (SHG) in nanostructures using gain-assisted plasmonic resonances. Significant intensity enhancements were achieved by exciting quadrupolar plasmons and matching frequencies.
Area of Science:
- Plasmonics
- Nonlinear Optics
- Nanophotonics
Background:
- Second harmonic generation (SHG) is crucial for nonlinear optical applications.
- Enhancing SHG in centrosymmetric materials is challenging due to symmetry constraints.
- Plasmonic nanostructures offer a route to enhance nonlinear optical phenomena.
Purpose of the Study:
- To theoretically investigate gain-assisted double plasmonic resonances for enhanced SHG.
- To explore the role of quadrupolar plasmons in boosting SHG.
- To achieve significant amplification of SHG intensity in a multilayered nanostructure.
Main Methods:
- Theoretical study of a silver-dielectric-gold-dielectric (SDGD) nanostructure.
- Incorporation of gain media into dielectric layers to compensate dissipation.
- Analysis of surface plasmon (SP) amplification and quadrupolar plasmon excitation.
- Mode matching conditions at fundamental and second harmonic (SH) frequencies.
Main Results:
- Giant amplification of surface plasmons (SPs) due to gain media.
- Excitation of local quadrupolar plasmon leading to boosted SHG.
- SHG near-field intensity enhancement by up to 4.43 × 10^2 and 1.21 × 10^5 times.
- Maximum SHG near-field enhancement of 6.55 × 10^7 times under double super-resonance conditions.
Conclusions:
- Gain-assisted double plasmonic resonances effectively enhance SHG in SDGD nanostructures.
- Quadrupolar plasmon excitation and mode matching are key to significant SHG amplification.
- The findings hold potential for developing advanced nanosensors and nanolasers.
