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Updated: Jul 1, 2026
11:08
Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
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Evolutionary design of two-dimensional material Fabry-Perot structures for enhanced second harmonic generation.
Rabindra Biswas1, Asish Prosad1, Lal A S Krishna1
1Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore 560012, India.
Nanophotonics (Berlin, Germany)
|December 5, 2024
Summary
This study introduces a hybrid-genetic optimization (HGA) method to design resonant photonic structures for enhanced nonlinear optical response in two-dimensional (2D) materials. The HGA approach significantly speeds up design and achieves substantial second harmonic generation (SHG) enhancement in gallium selenide (GaSe) flake devices.
Area of Science:
- Photonics and Optical Engineering
- Materials Science
- Nanotechnology
Background:
- Integrating two-dimensional (2D) materials with resonant photonic structures can enhance nonlinear optical properties.
- Traditional design methods for these structures are computationally intensive and may not optimize nonlinear signal generation.
Purpose of the Study:
- To develop and demonstrate a computationally efficient optimization technique for designing resonant photonic structures with 2D materials.
- To enhance second harmonic generation (SHG) in gallium selenide (GaSe) multilayer structures.
Main Methods:
- Utilized a hybrid-genetic optimization (HGA) algorithm for designing multilayer Fabry-Perot cavities.
- Experimentally fabricated and characterized structures with single and double gallium selenide (GaSe) flakes, silicon dioxide, and polymethyl methacrylate layers.
- Compared experimental results with a reference sample and previous reports.
Main Results:
- HGA accelerated cavity design by 8.8x (single GaSe) and 89x (double GaSe) compared to full parameter sweeps.
- Achieved measured SHG enhancement factors of 128x (single GaSe) and 400x (double GaSe) relative to a reference.
- Obtained SHG conversion efficiencies 1-2 orders of magnitude higher than previous studies on 2D material resonant systems.
Conclusions:
- HGA is a highly effective and efficient method for designing resonant photonic structures for enhanced nonlinear optics.
- The developed GaSe-based Fabry-Perot structures demonstrate significant improvements in SHG, paving the way for advanced photonic devices.
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