Optomechanical crystal with bound states in the continuum

Shengyan Liu, Hao Tong and Kejie Fang ()
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Shengyan Liu: University of Illinois at Urbana-Champaign
Hao Tong: University of Illinois at Urbana-Champaign
Kejie Fang: University of Illinois at Urbana-Champaign

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Chipscale micro- and nano-optomechanical systems, hinging on the intangible radiation-pressure force, have shown their unique strength in sensing, signal transduction, and exploration of quantum physics with mechanical resonators. Optomechanical crystals, as one of the leading device platforms, enable simultaneous molding of the band structure of optical photons and microwave phonons with strong optomechanical coupling. Here, we demonstrate a new breed of optomechanical crystals in two-dimensional slab-on-substrate structures empowered by mechanical bound states in the continuum (BICs) at 8 GHz. We show symmetry-induced BIC emergence with optomechanical couplings up to g/2π ≈ 2.5 MHz per unit cell, on par with low-dimensional optomechanical crystals. Our work paves the way towards exploration of photon-phonon interaction beyond suspended microcavities, which might lead to new applications of optomechanics from phonon sensing to quantum transduction.

Date: 2022
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DOI: 10.1038/s41467-022-30965-6

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