A Light Focusing Structure

Abstract

The invention discloses a light focusing structure. The light focusing structure is a three-dimensional taper asymmetric structure made of photoresist; two faces of the sides of the tapered asymmetric structure are tapered planes, and the other face is a tapered arc surfacer; the bottom surface of the tapered asymmetric structure is a plane; and the surface of the tapered non-asymmetric structure is plated with a metal layer. Incident light is coupled as plasma wave on the metal surface to focus on a structure tip, which can break through a diffraction limit and makes the diameter of a focusing facula smaller than 100 nanometers. Besides, the light focusing structure has no a symmetric axis in any direction, so that the light focusing structure can effectively utilize polarized light energy of any polarization direction under radiation of a wide light spectrum light source without polarization processing and can maximally utilize the incident light energy. The light focusing structure is high in feasibility, can be used for manufacturing the optical fiber probe to be used for near field optical detection, can be applied in the optical cutting edge field like the single molecule fluorescence imaging and has a high scientific research value and a wide market application prospect.

Description

technical field

[0001] The invention relates to the field of light energy focusing. It is based on the surface plasmon waves generated by the coupling of the metal on the surface of the micro-nano structure and the space light. Through the designed three-dimensional structure, it converges at the tip of the structure to form a focus of energy. Background technique

[0002] How to focus laser energy and obtain a smaller spot size is a long-term research problem in the field of light energy focusing. The focusing scheme adopted by ordinary light optics is to use a lens system such as a concave-convex lens to focus spatially parallel light. Due to the diffraction limit of light, this method cannot obtain a spot size on the order of tens of nanometers. The solution adopted by wave optics is to use the waveguide structure to convert the electromagnetic wave of light into an electromagnetic wave with a shorter wavelength, so as to break through the diffraction limit of light, so ...

Images