Kini Manjeshwar Sushanth, Ciers Anastasiia, Monsel Juliette, Pfeifer Hannes, Peralle Cindy, Wang Shu Min, Tassin Philippe, Wieczorek Witlef
Opt Express. 2023 Sep 11;31(19):30212-30226. doi: 10.1364/OE.496447.
Increasing the interaction between light and mechanical resonators is an ongoing endeavor in the field of cavity optomechanics. Optical microcavities allow for boosting the interaction strength through their strong spatial confinement of the optical field. In this work, we follow this approach by realizing a sub-wavelength-long, free-space optomechanical microcavity on-chip fabricated from an (Al,Ga)As heterostructure. A suspended GaAs photonic crystal mirror is acting as a highly reflective mechanical resonator, which together with a distributed Bragg (DBR) reflector forms an optomechanical microcavity. We demonstrate precise control over the microcavity resonance by change of the photonic crystal parameters. We find that the microcavity mode can strongly couple to the transmissive modes of the DBR. The interplay between the microcavity mode and a guided resonance of the photonic crystal modifies the cavity response and results in a stronger dynamical backaction on the mechanical resonator compared to conventional optomechanical dynamics.
增强光与机械谐振器之间的相互作用是腔光力学领域一项持续进行的工作。光学微腔能够通过其对光场的强空间限制来提高相互作用强度。在这项工作中，我们采用这种方法，通过在由（铝，镓）砷异质结构制成的芯片上实现一个亚波长长度的自由空间光机械微腔。一个悬浮的砷化镓光子晶体镜作为一个高反射率的机械谐振器，它与一个分布布拉格（DBR）反射器一起形成一个光机械微腔。我们通过改变光子晶体参数展示了对微腔共振的精确控制。我们发现微腔模式可以与DBR的透射模式强烈耦合。微腔模式与光子晶体的导模之间的相互作用改变了腔的响应，并且与传统光机械动力学相比，对机械谐振器产生了更强的动态反作用。
