Orientation-sensed Optomechanical Accelerometers based on Exceptional Points

We propose an optomechanical design, consisting of a parity-time symmetric multilayer structure tuned at exceptional-point degeneracy (EPD), with an adjustable layer that is coupled to micromechanical springs. The deflections of this layer in response to accelerations $α$, lead to square-root resonance detuning $Δω\equivω-ω_{EPD}\propto \sqrtα$ - thus dramatically enhancing the probe of ultra-small accelerations $α\ll1$. Our design is scalable and can, in principle, support higher $N$ order EPDs with sensitivity $Δω\propto\sqrt[n]α$. It also provides a pathway towards a new generation of on-chip hypersensitive accelerometers and vibrometers.

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