Surface plasma nanometer ring light filter

Abstract

The invention relates to a surface plasma nanometer ring light filter provided with a base material. A noble metal film is pasted on the base material. A round ring matrix processed through a focused ion beam etching method is arranged on the noble metal film. The inner diameter and the outer diameter of each round ring in the round ring matrix are set in advance according to different monochromatic light. The base material is made of one of quartz and glass, and the noble metal film is made of one of gold, silver and platinum. The surface plasma nanometer ring light filter uses the highly symmetrical round ring structure to solve the polarization sensitive problem universally existing in antenna grooves and one-dimensional pile grating light filter parts, and enables application range of similar light filter elements to be wider and adapt to natural light of non polarization better.

Description

technical field [0001] The invention belongs to an optical functional device, in particular to an optical filter, in particular to an optical filter with a nano-ring structure. Background technique [0002] Since the French scientist Ebbesen et al. first discovered the phenomenon of extraordinary optical transmission (EOT) in metal subwavelength structures in 1998 [1], the related research on surface plasmons has gained extensive attention and considerable development. . Devices prepared using the surface plasmon principle have the advantages of high resolution, easy modulation, and excellent performance, and have been widely used in optoelectronics, new energy (solar cells), data storage, and microscopic imaging. Among them, the development of optical filter devices is the fastest, and the application prospects are the broadest. In 2000 and 2006, British scientist Pendry proposed the concept of superlens with negative refractive index [2] and stealth conditions obtained b...

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Problems solved by technology

[0003] In order to solve the polarization sensitivity problem existing in linear grating / groove filters, the present invention proposes a surface plasmon nano-ring filter, which uses a highly symmetrical ring structure to solve the problem. It solves the problem of polarization sensitivity common to antenna grooves and one-dimensional layer stack grating filters, which makes similar filter devices have a wider range of applications and is more suitable for unpolarized natural light

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