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Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials

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Second-harmonic generation from split-ring resonators on a GaAs substrate.

F B P Niesler¹, N Feth, S Linden

¹Institut for Angewandte Physik, DFG-Center for Functional Nanostructures, Universität Karlsruhe, Karlsruhe, Germany. fabian.niesler@physik.uni-karlsruhe.de

|July 3, 2009

Summary

This summary is machine-generated.

We explored second-harmonic generation in gold split-ring resonators on GaAs. Our findings reveal a specific nonlinear optical effect arising from the interaction between resonator fields and the GaAs substrate.

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Area of Science:

Nonlinear optics
Plasmonics
Solid-state physics

Background:

Second-harmonic generation (SHG) is a key nonlinear optical process.
Split-ring resonators (SRRs) exhibit strong plasmonic field enhancement.
Gallium arsenide (GaAs) is a technologically important semiconductor with significant nonlinear optical properties.

Purpose of the Study:

To investigate SHG from SRRs on a GaAs substrate.
To identify the specific contributions to SHG from the interplay between SRR local fields and GaAs nonlinear susceptibility.
To validate experimental findings with theoretical modeling.

Main Methods:

Fabrication of gold split-ring resonators on crystalline GaAs substrates.
Systematic variation of SRR orientation relative to incident light polarization and GaAs crystallographic axes.
Optical characterization of second-harmonic generation.
Theoretical modeling of nonlinear optical response.

Main Results:

Unambiguous identification of a nonlinear optical contribution.
Demonstration of the interplay between plasmonic local fields and the bulk GaAs second-order nonlinear-susceptibility tensor.
Experimental results show good agreement with theoretical predictions.

Conclusions:

The study successfully isolates and identifies a specific nonlinear optical mechanism in the SRR-GaAs system.
This work provides a deeper understanding of nonlinear phenomena at the interface of plasmonic nanostructures and nonlinear optical substrates.
The findings have implications for designing advanced nonlinear optical devices.