Photonic nanojets have been previously shown (both theoretically and experimentally) to be highly sensitive to the presence of an ultra-subwavelength nanoscale particle within the nanojet. In the present work, photonic nanojets elongated by almost an order of magnitude (relative to the latest previously published work) are found to possess another key characteristic: they are sensitive to the presence of ultra-subwavelength nanoscale thin features embedded within a dielectric object. This additional characteristic of photonic nanojets is demonstrated through comparisons between fundamentally different 3-D and corresponding 1-D full Maxwell's equations finite-difference time-domain (FDTD) models.
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Article Synopsis
- A dielectric microsphere can gather light into a photonic nanojet (PNJ) that moves towards a near-infrared laser, while it was previously thought Janus particles with a metal layer couldn't stable produce PNJs.
- Researchers found that synthetic Janus particles can also generate a PNJ and experience a backaction force due to their unique composition, even with non-resonant light.
- The study reveals that these Janus particles show a unique hysteresis effect in the backaction force based on laser power changes, suggesting potential applications in manipulating and sorting irregular particles using light.
In this work, we study the imaging performance of microsphere-assisted microscopy (MAM) using microspheres with different refractive indices and immersion conditions under both bright-field illumination (BFI) and dark-field illumination (DFI). The experimental results show that the position of the photonic nanojet of the microsphere plays an important role in MAM imaging. The contrast in imaging is affected by the reflection from the microsphere, the background signal without the microsphere, and the electric field on the substrate surface.
View Article and Find Full Text PDFArticle Synopsis
- This study looks at how to control special light beams called photonic nanojets (PNJs) using cylindrical shapes that can bend light.
- It shows that by using different light styles, we can create different shapes of PNJs, like rod-like and tube-like, which work well even when they are small.
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