N atomic force microscope. The position in the microsphere might be changed by moving the cantilever, in order that near-field data of your target position may be collected, and super-resolution pictures of any sample region is often obtained [136]. As shown in Figure 7e, the microspheres around the cantilever are utilized to approach the sample to comprehend imaging with the disc having a Methyl jasmonate custom synthesis spacing of 80 nm. In addition, the fiber probe also can act as a cantilever to improve the flexibility of imaging, applying fiber tweezers to trap cells and scan the characters etched on the silicon substrate at a rate of 20 /s [79], as shown in Figure 7f. Furthermore, a 2 2 C10 H7 Br droplet microlens array was assembled utilizing optical tweezers [115] and also the assembled droplet microlens was transferred towards the polystyrene nanoparticle surface with the stack, where the contour from the nanoparticle became apparent within the field of view in the microscope (Figure 7g). Allen et al. [137] employed high refractive index (n = two) BaTiO3 microspheres embedded in PDMS films to achieve significant location imaging of 60 nm Au dimer spacing and 15 nm butterfly junction arrays. Zhang et al. [138] utilised BaTiO3 microspheres embedded in PDMS films to image the streak GSK2646264 Cancer structure on the surface of a Blu-ray disc (Figure 7h). In addition, by means of the dynamic scanning imaging mode from the microlens array as well as the superimposed reconstruction mode with the random microlens array region imaging, a 900 2 surface image stitched by 210 images was realized (Figure 7i), which can decrease the amount of photos needed, increase imaging efficiency, and improve the observation variety.Photonics 2021, 8, 434 Photonics 2021, 8, x FOR PEER REVIEW14 of 22 15 ofFigure Optical imaging of of nanostructures microspheres. (a) SiO SiO2 microspheres on goldFigure 7.7. Optical imaging nanostructures withwith microspheres. (a)microspheres on gold-plated two plated porous anodic aluminum oxide film; (b) BaTiO3 microspheres on nano-plasma samples with porous anodic aluminum oxide film; (b) BaTiO3 microspheres on nano-plasma samples having a gap of a gap of 500 nm; (c) TiO2 microsphere superlenses on 60 nm wafers; (d) Magnified image of gold 500 nm; (c) TiO2 microsphere superlenses on 60 nm wafers; (d) Magnified image of gold splitting splitting square nanostructures imaged making use of microspheres combined with micropipettes; (e) Magsquare nanostructures imaged utilizing microspheres combined with micropipettes; (e) Magnified image nified image of a microsphere combined with an AFM cantilever against a DVD; (f) Optical pictures of a nanopatternscombinedon the fiber ofcantilever against(g)DVD; (f) pictures images of nanopatterns a of microsphere trapped with an AFM a biomagnifier; a Optical Optical of PS nanoparticles by trapped around the fiber of a biomagnifier; imaging of photos of PS nanoparticles by a 2 two (i) The Blu2 2 microlens array; (h) Large-area (g) Optical Blu-ray discs by BaTiO3 microlenses; microlens array; (h)surface recorded employing the random microlens array region imaging superimposed reconstrucray disc Large-area imaging of Blu-ray discs by BaTiO3 microlenses; (i) The Blu-ray disc surface tion mode. recorded applying the random microlens array location imaging superimposed reconstruction mode.4.two. Super-Resolution Imaging of Living Cells by Photonic Nanojets 4.two. Super-Resolution Imaging of Living Cells by Photonic Nanojets The combination ofof microsphere superlenses and optical imaging device for biologiThe mixture microsphere superlenses and an an optical imaging.