Related Experiment Video
Updated: Oct 14, 2025
09:33
Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
6.4K
Dynamically tunable third-harmonic generation with all-dielectric metasurfaces incorporating phase-change
Optics Letters
|November 1, 2021
Summary
This study introduces a novel phase-change metasurface for dynamic control of nonlinear optical sources. It demonstrates a high-contrast third-harmonic generation switch with potential for optical computing and communications.
Area of Science:
- Photonics and Nanotechnology
- Materials Science
- Nonlinear Optics
Background:
- Subwavelength nonlinear optical sources are highly efficient but lack dynamic controllability.
- Germanium antimony telluride (GST) exhibits non-volatile refractive index changes, making it suitable for reconfigurable nanostructures.
Purpose of the Study:
- To numerically demonstrate an electromagnetically-induced-transparency-based silicon metasurface for actively controlling nonlinear optical sources.
- To achieve dynamic modulation of third-harmonic generation (THG) using GST.
Main Methods:
- Utilizing a quarter-wave asymmetric Fabry-Perot cavity with GST to modulate optical phase.
- Implementing an electromagnetically-induced-transparency (EIT) effect in a silicon metasurface.
- Controlling GST crystallization fraction for multi-level amplitude modulation.
Main Results:
- Demonstrated a giant third-harmonic generation (THG) switch with a modulation depth of approximately 70 dB.
- Achieved multi-level THG amplitude modulation by controlling GST's intermediate states.
- Showcased dynamic control of nonlinear optical responses at the C-band.
Conclusions:
- GST-based nonlinear photonic switches offer fast dynamic control and high modulation depth.
- The developed metasurface has significant potential for applications in optical communications and computing.
- This work paves the way for advanced reconfigurable photonic devices.
