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Updated: Jun 5, 2025

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

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Optically Defined Phononic Crystal Defect.

Thomas J Clark¹, Simon Bernard¹, Jiaxing Ma¹

¹Department of Physics, <a href="https://ror.org/01pxwe438">McGill University</a>, Montréal, Québec H3A 2T8, Canada.

Physical Review Letters

|December 13, 2024

Summary

This summary is machine-generated.

Researchers created a mechanical crystal with a defect mode controlled by light. This optical method confines mechanical vibrations to specific areas, enhancing frequency shifts and reducing effective mass for novel defect engineering.

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Area of Science:

Solid-state physics
Materials science
Nanotechnology

Background:

Phononic crystals control mechanical vibrations.
Creating localized mechanical defects is challenging.
Optical control offers reconfigurability.

Purpose of the Study:

To demonstrate all-optical control of mechanical defect modes.
To localize mechanical modes within a phononic crystal.
To achieve in situ reconfigurability of mechanical defects.

Main Methods:

Utilizing an optical spring to manipulate a phononic crystal membrane.
Transferring a mechanical mode into the crystal's band gap.
Measuring frequency shifts and effective mass changes.

Main Results:

Successfully localized a mechanical mode within a few unit cells.
Observed a significant frequency shift due to mode confinement.
Demonstrated a 37-fold reduction in the mode's participating mass.
Achieved fast and reversible all-optical control.

Conclusions:

All-optical control provides a new method for engineering mechanical defects.
In situ reconfigurability of mechanical defects is achievable.
This technique offers advantages for advanced mechanical systems.