论文标题
介质颗粒光学结合的巨大谐振增强
Giant resonant enhancement of optical binding of dielectric particles
论文作者
论文摘要
两个相同的电介质颗粒的光学耦合会导致键合和抗键共振。 后者的特征是在次波长范围内高指数微米尺寸粒子的$ Q $因子的谐振宽度大大缩小和强大的增强。我们将形状的颗粒视为在双重不相干反向传播贝塞尔束的同轴照明下的球形和磁盘。在球体的情况下，我们得出了光学结合力（OB）力的分析表达式，该表达式为$ 1/l^2 $，对于大距离$ l $之间的$ 1/l^2 $，并显示了两个振荡。对于近距离，OB力在谐振方面大大增加。 与两个球体相比，由于磁盘之间的距离和每个磁盘之间距离之间的距离和纵横比的差异的变化变化，因此两个同轴磁盘的情况与两个球体相比，具有极大的增强。在这种情况下，我们证明了直到几十年的纳米牛顿，OB力的前所未有。我们表明，OB力的大小和迹象在很大程度上取决于贝塞尔束的纵向波矢量。
Optical coupling of two identical dielectric particles gives rise to bonding and anti-bonding resonances. The latter is featured by significant narrowing of the resonant width and strong enhancement of the $Q$ factor for the high index micron size particles in subwavelength range. We consider particles shaped as spheres and disks under coaxial illumination of dual incoherent counter propagating Bessel beams. In the case of spheres we derive analytical expressions for the optical binding (OB) force which decreases as $1/L^2$ for large distance $L$ between the spheres and displays two periods of oscillations. For close distances the OB force enormously increases in the resonant regime. The case of two coaxial disks owing to variation of the distance between disks and aspect ratio of each disk is featured by extremal enhancement of the $Q$ factor compared to the case of two spheres. In that case we demonstrate unprecedent enhancement of the OB force up to several decades of nano Newtons. We show that the magnitude and sign of the OB force strongly depend on the longitudinal wave vector of the Bessel beams.
