Artificial surface plasmon-based annular resonator

Abstract

The invention discloses an artificial surface plasmon-based annular resonator. The artificial surface plasmon-based annular resonator is simple in structure and consists of metal units which are arranged periodically, wherein the thickness of each metal unit is far less than the operating wavelength, and the transmission of surface waves can be bound in the depth sub-wavelength size on the periphery of a metal strip to realize the high-efficiency transmission of energy. The surface plasmon on a straight waveguide can be coupled to a ring for transmitting and is re-coupled back to the straight waveguide after surrounding a circle to interfere with the artificial surface plasmon transmitted on the straight waveguide. The artificial surface plasmon-based annular resonator is of a planarized and structured surface metal strip structure, which supports the transmission of the surface plasmon; and electromagnetic surface waves are bound to the surface of the planarized and structured metal, are bound in the sub-wavelength size range of a structural surface in a direction vertical to the transmission direction, and are exponentially attenuated along the direction vertical to the surface, so that structural size can be scaled to make the resonator work in the frequency bands of terahertz, microwave and millimeter wave.

Description

Technical field [0001] The invention belongs to the field of artificial surface plasmons, and in particular relates to a ring resonator based on artificial surface plasmons. Background technique [0002] Surface plasmon polaritons (SPPs) are oscillations formed by free electrons on the metal surface induced by an external electromagnetic field. They can generate surface electromagnetic waves that propagate along the surface of the metal and medium, and limit the electromagnetic field energy to the deep sub-wavelength range. In this way, it conducts electromagnetic waves with the same bandwidth as the traditional photonic circuit, and is not restricted by the diffraction limit. This makes it possible for SPP devices to achieve the perfect combination of photonics and electronic components on the nanometer scale in the future, so they have received widespread attention. [0003] However, SPP in nature only exists in the light band. In order to realize SPP in lower frequency bands (T...

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Problems solved by technology

[0008] At present, the research on artificial surface plasmons is based on one-dimensional periodic structure, two-dimensional infinite planar structure or three-dimensional structure with limited thickness, which often have relatively large volume and area, and the electromagnetic field can only be confined in the vertical medium / metal The interface attenuates exponentially in one dimension, and there is still a long way to go to realize the subwavelength confinement transmission of electromagnetic waves

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