On-chip mechanical exceptional points based on an optomechanical zipper cavity

Area of Science:

• Physics
• Quantum Mechanics
• Nanotechnology

Background:

• Exceptional points (EPs) are spectral singularities in non-Hermitian systems.
• Optical EPs have been explored for various physics concepts.
• Mechanical systems offer potential for EP exploitation in sensing and dynamics.

Purpose of the Study:

• To demonstrate on-chip mechanical exceptional points (EPs).
• To utilize a silicon optomechanical zipper cavity for EP realization.
• To explore applications of mechanical EPs in ultrasensitive measurements.

Main Methods:

• Coupling two near-degenerate mechanical breathing modes via a single optical mode.
• Utilizing a silicon optomechanical zipper cavity.
• Tailoring dissipative and coherent couplings between mechanical oscillators.

Main Results:

• Successful demonstration of on-chip mechanical EPs.
• Observation of 1/2 order spectral splitting, a signature of EPs.
• Creation of an integrated platform for mechanical EP research.

Conclusions:

• The study provides an integrated silicon chip platform for mechanical EPs.
• Mechanical EPs show potential for ultrasensitive measurements.
• This work advances the understanding and application of EPs beyond photonics.