Yang Jianming, Twardowski Patrice, Gérard Philippe, Duo Yi, Fontaine Joël, Lecler Sylvain
Opt Express. 2018 Feb 19;26(4):3723-3731. doi: 10.1364/OE.26.003723.
A glass cuboid, embedded inside a dielectric cylinder is studied when illuminated with a monochromatic plane wave. A photonic nanojet (PNJ) with a full-width at half-maximum (FWHM) waist of around 0.25λ is obtained outside the external surface of the cuboid. The influence of the parameters of a square section cuboid is studied. Three particular phenomena can be obtained and are discussed: an ultra-narrow PNJ on the external surface of the cuboid, a long photonic jet and the excitation of whispering gallery modes (WGMs). A parametric study, over the width and the height of a rectangular section cuboid, shows that these parameters can be used to control the photonic jet properties. We also study several other geometries of the insert, which shows that the key parameter is the refractive index of the inserted material. Finally, we show that by changing the incident angle we can obtain a curved photonic jet.
当用单色平面波照射时，对嵌入电介质圆柱体内的玻璃长方体进行了研究。在长方体的外表面之外获得了一个半高宽（FWHM）腰宽约为0.25λ的光子纳米射流（PNJ）。研究了方形截面长方体参数的影响。可以得到并讨论三种特殊现象：长方体外表面上的超窄PNJ、长光子射流以及回音壁模式（WGMs）的激发。对矩形截面长方体的宽度和高度进行的参数研究表明，这些参数可用于控制光子射流的特性。我们还研究了插入物的其他几种几何形状，结果表明关键参数是插入材料的折射率。最后，我们表明通过改变入射角可以获得弯曲的光子射流。
