Photonic nanojets generated by rough surface micro-cylinders

This paper studies the photonic nanojets generated by micro-cylinders with rough surfaces using FDTD method. Photonic nanojets are observed when plane wave propagates through various micro-cylinders embedded in vacuum. When micro-cylinders are embedded in water medium, the dimension of the generated photonic nanojets increases, as well as the distance between the micro-cylinders and the photonic nanojets. While the maximum intensity of the photonic nanojets decreases. In addition, photonic nanojet disappears when using rough surface micro-cylinders due to the strong random scattering and interference effect. In practice, these results provide guidance when using photonic nanojets for probing and manipulating nanoscale objects, nanopatterning and nanolithography with subwavelength spatial resolution and ultra-high density optical storage.