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In this paper, focusing patterns are theoretically investigated by Richards-Wolf's integral in a high numerical aperture lens illuminated by a polarized beam. The doughnut beam is introduced to achieve high resolution focusing spot. The focusing spot is as small as half of wavelength. Meanwhile, the optical needle with super-resolution lateral size is realized by using a complex amplitude filter....
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...
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