electric field enhancement structure

Abstract

An electric field enhancing structure is provided. The electric field enhancing structure comprises a base layer, a medium layer on the surface of the base layer, a separating layer on the surface of the medium layer, and a dielectric particle layer on the surface of the separating layer. The dielectric particle layer is formed by a plurality of dielectric particles. The refractive index of the dielectric particles is higher than that of the separating layer. The electric field enhancing structure is advantageous in that the dielectric particles having the high refractive index interact with an incident electromagnetic field to generate a resonance electromagnetic coupling mode so that heat loss is greatly reduced, the dielectric particles are close to a metal and hold the separating layer having a certain low refractive index, the electromagnetic resonance mode of the dielectric particles interacts with a plasmon mode of adjacent metal so that a large electromagnetic enhanced field is formed between the dielectric particles and the metal, and existence of the separating layer low in refractive index can avoid direct contact between the metal and a detected object, thus effectively preventing Raman signal, fluorescence signal, and the like of the detected object from being quenched.

Description

technical field [0001] The invention relates to the field of optical field enhancement, in particular to an electric field enhancement structure for enhancing the intensity of an incident optical field. Background technique [0002] The collective oscillation of surface electrons generated by metal particles under the excitation and coupling of electromagnetic waves exhibits exotic optical properties, which are the so-called localized plasmon resonance properties. This kind of resonance of light and electrons can confine light on the surface of metal particles in the range of tens of nanometers or even smaller, and form a strong local electromagnetic field, localized plasmon of metal particles, super strong optical localization and optical field The enhanced properties make it show great application prospects in biosensors, surface-enhanced Raman spectroscopy, and fluorescence-enhanced spectroscopy. [0003] Surface-enhanced Raman spectroscopy based on metal particles is a ...

AI Technical Summary

Problems solved by technology

The increase in the temperature of the metal particles will not only cause the degradation of its Raman signal enhancement performance in the detection of molecules in Raman spectroscopy, but also may change the properties of the metal particles and their surrounding detection substances, thereby enhancing the electric field of the metal particles. Limited use in some biomedical applications

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