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Second Harmonic Generation from Phase-Engineered Metasurfaces of Nanoprisms.
Kanta Mochizuki1, Mako Sugiura1, Hirofumi Yogo1
1Department of Applied Chemistry and Biochemical Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka 432-8561, Japan.
Micromachines
|September 16, 2020
Summary
Researchers enhanced second harmonic generation (SHG) using gold (Au) nanoprism metasurfaces. Optimizing SiO2 spacer thickness maximized SHG by over 3500 times due to plasmonic resonance and electric field enhancement.
Area of Science:
- Plasmonics
- Nonlinear Optics
- Nanophotonics
Background:
- Metasurfaces enable tailored light-matter interactions.
- Second Harmonic Generation (SHG) is a key nonlinear optical process.
- Non-centro-symmetric nanostructures are crucial for efficient SHG.
Purpose of the Study:
- To fabricate and optimize gold (Au) nanoprism metasurfaces for enhanced SHG.
- To investigate the role of spacer thickness and electric field enhancement on SHG intensity.
- To correlate numerical modeling with experimental SHG measurements.
Main Methods:
- Fabrication of Au nanoprism metasurfaces on SiO2-Si substrates using electron beam lithography and lift-off.
- Experimental characterization of SHG and reflectivity spectra.
- Numerical modeling of light enhancement at the fundamental wavelength.
Main Results:
- Optimized SiO2 spacer thickness was identified as a critical parameter for SHG enhancement.
- SHG intensity strongly correlates with electric field enhancement at the fundamental wavelength.
- Experimental SHG measurements validated numerical modeling predictions.
- SHG enhancement factors up to approximately 3.5 × 10^3 were achieved at plasmonic resonance.
Conclusions:
- Gold nanoprism metasurfaces are effective for significantly enhancing SHG.
- Precise control over nanostructure geometry and dielectric environment is key to maximizing nonlinear optical responses.
- This work demonstrates a pathway for developing advanced photonic devices utilizing nonlinear phenomena.
