Nano laser based on metal tip and air slot surface plasmon polaritons

Abstract

The invention discloses a nano laser based on metal tip and air slot surface plasmon polaritons. The nano laser comprises an insulating layer, and a gain medium cavity, an air gap layer and a metal tip layer which are connected by the insulating layer, wherein the air gap layer is an air slot of the insulating layer, and is arranged at the middle position of the upper edge of the insulating layer; the gain medium cavity is arranged above the air gap layer, and the cross section of the gain medium cavity is connected with the cross section of the air gas layer by two intersection points; and the metal tip layer is arranged below the air gap layer, and the metal tip layer is coated by the insulating layer, one tip of the cross section of the metal tip layer is intersected with the cross section of the air gap layer into one point. The nano laser disclosed by the invention is low in energy loss, can be implemented at the room temperature, has a smaller threshold value, can reasonably balance energy loss and local mode limitation, is convenient to manufacture, has a smaller size, and has the smaller threshold value and more excellent comprehensive performance.

Description

Technical field [0001] The invention relates to the field of laser technology, in particular to a surface plasmon-based nano laser based on a metal tip-air groove. Background technique [0002] In recent years, with the development of nanotechnology, device miniaturization has gradually become a trend. People's in-depth exploration of the nanoworld requires ultra-small and ultra-fast lasers to concentrate the energy of light into the sub-wavelength size region. In general, when the size of the structure of the light action is larger than the wavelength of the light wave, zero-order transmission and reflection diffraction waves and high-order transmission and reflection diffraction waves will be generated, which makes the beam unable to achieve sub-wavelength, but has small size and weight. The sub-wavelength device (device size is smaller than the wavelength) with many advantages, such as light weight and easy replication, only produces zero-order reflected and transmitted diffr...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a kind of energy loss in the prior art, which is difficult to realize at room temperature, the distribution of the light field is not concentrated, the threshold of the nano-laser is large, and the overall performance is poor. Nanolaser based on metal tip-air groove surface plasmon polaritons with small loss, can be realized at room temperature, smaller threshold, and better overall performance

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