Photonics Research, Volume. 9, Issue 7, 1157(2021)
Inflection point: a perspective on photonic nanojets
Fig. 1. Schematic illustration of the research model and the obtained inflection point. (a) 3D schematic diagram of a dielectric microcylinder illuminated by an incident plane EM wave. (b) 2D representation of the research model in (a). Green solid lines show the process of a plane wave propagation through the microcylinder. RSC, region of slow change; RRC, region of rapid change; RWC, region of weak contribution;
Fig. 2. 2D optical field distributions of light illuminating the (a-1) RSC, (a-2) RRC, and (a-3) composite region of “RWC + RRC” obtained from FEM-based full-wave simulations. The model parameters are:
Fig. 3. Inflection point between RSC and RRC of the first LRI for the model of plane-wave-illuminated microcylinder varies with the RIC of microcylinder and environment medium. (b) Position distributions of the emitting points
Fig. 4. (a) Working distance
Fig. 5. Schematic diagrams illustrate the existence of (a-1) PNJ and (a-2) PH for the cases of
Fig. 6. PHs formed at the rear surface of the microcylinder under illumination conditions of (a)
Fig. 7. Modulation of PH key parameters (
Fig. 8. Bending angles (
Fig. 9. Distributions of energy flow streamlines of (a-1) RRC and (a-2) “RWC + RRC” on the first LRI illuminated by a plane wave. From the central symmetry axis of the microcylinder to both sides, the 11 streamlines are represented by Arabic numbers 1–11 and marked with small circles. (b) Relative differences in
Fig. 10. Contour plots of optical field distributions for the illumination conditions of (a)
Fig. 11. (a) Schematic diagram used to define the bending angle of PH. “B,” selected arc line on the boundary between the microcylinder and environmental medium;
Fig. 12. Schematic diagram of a plane-wave-illuminated microcylinder made of composite materials. The refractive indices of the upper, middle, and lower parts of the microcylinder are
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Guoqiang Gu, Pengcheng Zhang, Sihui Chen, Yi Zhang, Hui Yang. Inflection point: a perspective on photonic nanojets[J]. Photonics Research, 2021, 9(7): 1157
Category: Nanophotonics and Photonic Crystals
Received: Jan. 6, 2021
Accepted: Mar. 25, 2021
Published Online: Jun. 9, 2021
The Author Email: Hui Yang (hui.yang@siat.ac.cn)