逆反射光子纳米射流克服中尺度光聚焦的光学对比度极限
Overcoming optical contrast limit of mesoscale light focusing by means of retrograde-reflection photonic nanojet
摘要：
从理论上分析了逆反射模式下亚波长光子纳米射流的物理起源。这种特定类型的光子纳米喷射出现在平面光波的连续双聚焦时，由位于平面反射镜附近的透明电介质微粒引起。据我们所知，我们第一次报道了逆PNJ的独特性质，其用于使用光学对比度超过极限值（n > 2）的微粒来增加其焦距和强度，这从根本上将逆PNJ与常规PNJ行为区分开。这可能会大大增加基于PNJ的光镊的捕获潜力。
英文摘要：
The physical origin of subwavelength photonic nanojet in retrograde-reflection mode (retro-PNJ) is theoretically considered. This specific type of photonic nanojet emerges upon sequential double focusing of a plane optical wave by a transparent dielectric microparticle located near a flat reflecting mirror. For the first time to the best of our knowledge, we report a unique property of retro-PNJ for increasing its focal length and intensity using microparticles with the optical contrast exceeding limiting value (n > 2) that fundamentally distinguishes retro-PNJ from regular PNJ behavior. This may drastically increase the trapping potential of PNJ-based optical tweezers.
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