Opt Express. 2023 Feb 13;31(4):6623-6632. doi: 10.1364/OE.482723.
We have investigated the effect of enhanced optical force via the acoustic graphene plasmon (AGP) cavities with the ultra-small mode volumes. The AGP mode can generate stronger field confinement and higher momentum, which could provide giant optical force, and has no polarization preference for the optical source. We have demonstrated that the trapping potential and force applied on polystyrene nanoparticle in the AGP cavities are as high as -13.6 × 10 kT/mW and 2.5 nN/mW, respectively. The effect of radius of rounded corners and gap distance of AGP cavities on the optical force has been studied. Compared with an ideal nanocube, nanocube with rounded corners is more in line with the actual situation of the device. These results show that the larger radius of nanocube rounded corners, the smaller trapping potential and force provided by AGP cavities. Our results pave a new idea for the investigation of optical field and optical force via acoustic plasmon mode.
我们研究了通过具有超小模式体积的声学石墨烯等离子体（AGP）腔增强光力的效果。AGP 模式可以产生更强的场限制和更高的动量，从而提供巨大的光力，并且对光源没有极化偏好。我们已经证明，在 AGP 腔中的聚苯乙烯纳米粒子上的捕获势和施加的力分别高达-13.6×10 kT/mW 和 2.5 nN/mW。研究了 AGP 腔的圆角半径和间隙距离对光力的影响。与理想的纳米立方体相比，带有圆角的纳米立方体更符合器件的实际情况。这些结果表明，纳米立方体圆角的半径越大，AGP 腔提供的捕获势和力就越小。我们的结果为通过声波等离子体模式研究光场和光力开辟了新的思路。
