非对称膜中的成键、反键和可调光学力
Bonding, antibonding and tunable optical forces in asymmetric membranes
摘要：
我们表明，可调的吸引力（键合）和排斥力（反键合）可以出现在高度不对称的结构耦合到外部辐射，导波共振，首先预测在对称系统的键合/反键合水平排斥的后果。我们的重点是由悬浮在未图案化分层衬底上方的光子晶体（多孔）膜组成的几何形状，支持可以通过多孔膜的周期性调制耦合的平面波导模式。与对称双膜结构相比，非对称几何结构在易于制造和实验表征方面具有明显的优势。我们发现，不对称性也可能导致不寻常的行为的力的大小的键合/反键对膜分离的变化，包括非单调依赖的分离。我们提出了一种计算方法，通过一个单一的时域模拟获得整个力谱，通过傅立叶变换的响应，以一个短脉冲，从而获得频率依赖的应力张量。我们指出，通过操作两个，而不是一个单一的频率，这些倏逝力可以被利用来调整膜的弹性常数，而不改变其平衡分离。
英文摘要：
We demonstrate that tunable attractive (bonding) and repulsive (anti-bonding) forces can arise in highly asymmetric structures coupled to external radiation, a consequence of the bonding/anti-bonding level repulsion of guided-wave resonances that was first predicted in symmetric systems. Our focus is a geometry consisting of a photonic-crystal (holey) membrane suspended above an unpatterned layered substrate, supporting planar waveguide modes that can couple via the periodic modulation of the holey membrane. Asymmetric geometries have a clear advantage in ease of fabrication and experimental characterization compared to symmetric double-membrane structures. We show that the asymmetry can also lead to unusual behavior in the force magnitudes of a bonding/antibonding pair as the membrane separation changes, including nonmonotonic dependences on the separation. We propose a computational method that obtains the entire force spectrum via a single time-domain simulation, by Fourier-transforming the response to a short pulse and thereby obtaining the frequency-dependent stress tensor. We point out that by operating with two, instead of a single frequency, these evanescent forces can be exploited to tune the spring constant of the membrane without changing its equilibrium separation.
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