Tunable Optical Forces Enabled by Bilayer van der Waals Materials
Tunable Optical Forces Enabled by Bilayer van der Waals Materials
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DOI：
10.1002/adom.202301288
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发表时间：
2023-10
影响因子：
9
通讯作者：
Ziqiang Cai;Renchao Jin;Yihao Xu;Yongmin Liu
中科院分区：
文献类型：
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作者：
Ziqiang Cai;Renchao Jin;Yihao Xu;Yongmin Liu
光诱导力操纵纳米粒子在纳米技术和生物工程中有着广泛的应用。在正常情况下，当纳米粒子被光波照射时，从光到纳米粒子的动量转移可以推动它沿着光的传播方向移动。另一方面，横向光学力可以垂直于光传播方向传送对象，并且光学拉力可以将对象吸引到光源。虽然这些光学力已经引起了越来越多的关注，但对它们的原位调谐却很少有人探索。本文通过石墨烯/α相三氧化钼(α-MoO_3)双层结构，数值模拟了横向光学力和光学拉力的调谐。在平面波照射下，作用在双层结构上方的纳米粒子的光学力的幅度和方向都可以在中红外范围内调节。通过研究石墨烯/α-MoO_3双层膜支撑的混合等离子体声子-声子极化子对应的等频轮廓，可以了解其潜在的机制。使用偶极近似方法的解析研究再现了数值结果，揭示了光学力的起源。这项工作为工程光学力量操纵各种物体开辟了一条新的途径。
Manipulation of nanoparticles by light induced forces is widely used in nanotechnology and bioengineering. In normal cases, when a nanoparticle is illuminated by light waves, the transfer of momentum from light to the nanoparticle can push it to move along the light propagation direction. On the other hand, the lateral optical force can transport an object perpendicular to the light propagation direction, and the optical pulling force can attract an object toward the light source. Although these optical forces have drawn growing attention, in situ tuning of them is rarely explored. In this paper, tuning of both lateral optical forces and optical pulling forces is numerically demonstrated via a graphene/α‐phase molybdenum trioxide (α‐MoO3) bilayer structure. Under plane‐wave illumination, both the amplitude and direction of the optical forces exerted on a nanoparticle above this bilayer structure can be tuned in the mid‐infrared range. The underlying mechanism can be understood by studying the corresponding isofrequency contours of the hybrid plasmon‐phonon polaritons supported by the graphene/α‐MoO3 bilayer. The analytical study using the dipole approximation method reproduces the numerical results, revealing the origin of the optical forces. This work opens a new avenue for engineering optical forces to manipulate various objects optically.