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Harmonic Nanoparticles for Regenerative Research
Published on: May 1, 2014
Doubly resonant metallic nanostructure for high conversion efficiency of second harmonic generation
Sinjeung Park1, Jae W Hahn, Jae Yong Lee
1Nano Photonics Laboratory, School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-749, South Korea.
Optics Express
|March 16, 2012
Summary
Researchers developed a novel plasmonic nanodevice for efficient second harmonic generation. This nanodevice significantly enhances nonlinear emission, paving the way for advanced nanophotonic devices.
Area of Science:
- Photonics
- Nanotechnology
- Nonlinear Optics
Background:
- Metallic nanostructures exhibit strong nonlinear emission, enabling functional nanophotonic devices.
- Second harmonic generation (SHG) is a key nonlinear optical process with applications in frequency conversion.
Purpose of the Study:
- To demonstrate a novel plasmonic nanodevice design for high conversion efficiency of second harmonic generation.
- To investigate the role of coupled resonances in enhancing SHG.
Main Methods:
- Fabrication of a 4x4 bowtie aperture array.
- Utilizing plasmonic resonance for local field enhancement of the fundamental wave.
- Employing Fabry-Pérot resonance for high transmission of the second harmonic wave.
- Integrating nanostructures for surface plasmon polariton excitation and higher-order diffraction suppression.
- Incorporating an anti-reflection layer.
Main Results:
- Achieved a second harmonic conversion efficiency of 1.4 x 10^-8.
- Obtained an efficiency nearly an order of magnitude higher than previously reported results.
- Theoretically analyzed and confirmed the role of double resonances (plasmonic and Fabry-Pérot) in augmenting the SHG response.
Conclusions:
- The designed plasmonic nanodevice significantly enhances second harmonic generation efficiency through coupled resonances.
- This work offers a promising pathway for developing high-performance nanophotonic devices for nonlinear optical applications.
