Actively tunable laser action in GeSn nanomechanical oscillators

Area of Science:

• Optoelectronics
• Nanotechnology
• Materials Science

Background:

• Mechanical forces from oscillations can tune material properties like refractive index.
• Dynamic mechanical forces have not been used for tunable lasers.
• Precise control of mechanical oscillations is well-established.

Purpose of the Study:

• To demonstrate actively tunable mid-infrared laser action.
• To utilize group-IV nanomechanical oscillators for tunable lasers.
• To explore the use of dynamic mechanical forces in laser development.

Main Methods:

• Fabrication of a suspended Germanium-Tin (GeSn) cantilever nanobeam on a Silicon (Si) substrate.
• Resonant driving of the nanobeam using radio-frequency waves.
• Inducing time-varying elastic strain in the GeSn nanobeam via electrically controlled mechanical oscillation.

Main Results:

• Achieved actively tunable laser emission in the mid-infrared (>2 μm wavelengths).
• Demonstrated wide-range tunability by utilizing radio-frequency mechanical resonances.
• Showcased ultralow power consumption for laser tuning.

Conclusions:

• Group-IV nanomechanical oscillators offer a compact platform for tunable mid-infrared lasers.
• Electrically controlled mechanical oscillations provide an effective method for active laser tuning.
• This approach presents a promising pathway for energy-efficient, tunable laser sources.