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Tunable high-order harmonic generation in GeSbTe nano-films.

Viacheslav Korolev¹, Artem D Sinelnik¹, Mikhail V Rybin^2,3

¹Friedrich-Schiller University Jena, Jena, Germany.

Nanophotonics (Berlin, Germany)

|December 5, 2024

Summary

This summary is machine-generated.

We demonstrate dynamic control over high-order harmonic generation (HHG) in germanium antimony telluride (GST) by optically switching its crystal phase. This phase-change material offers new possibilities for ultrafast optical control in photonic devices.

Keywords:

GST active nonlinear photonics high harmonic generation phase change material

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Area of Science:

Condensed matter physics
Ultrafast spectroscopy
Nanophotonics

Background:

High-order harmonic generation (HHG) in solids is crucial for ultrafast spectroscopy and attosecond pulse generation.
Nanoscale structuring of surfaces offers control over harmonic emission properties.
Phase-change materials present unique opportunities for dynamic optical control.

Purpose of the Study:

To investigate high-order harmonic generation (HHG) in the phase-change material Ge₂Sb₂Te₅ (GST).
To explore the potential of optical phase-switching for controlling HHG.
To assess GST as a material for dynamic photonic structures.

Main Methods:

Studying HHG in nanoscale structured GST.
Utilizing optical methods to induce reversible phase transitions between crystalline and amorphous states.
Characterizing the resulting changes in harmonic emission.

Main Results:

Demonstrated reversible optical phase-switching in GST.
Showcased dynamic control over harmonic emission efficiency and spatial characteristics.
Confirmed the feasibility of using phase-switching for ultrafast optical modulation.

Conclusions:

Ge₂Sb₂Te₅ (GST) is a viable material for dynamic control of high-order harmonic generation.
Optical phase-switching in GST enables flexible metasurfaces and photonic devices.
This work introduces new avenues for ultrafast optical control in condensed matter systems.