Broadband spatial coherence thermal radiation light source

Abstract

The invention relates to a broadband spatial coherence thermal radiation light source, comprising a metal structure layer, a medium layer and a lower base plate metal layer, wherein the lower base plate metal layer is a supporting layer and a thermal conductive layer, and the medium layer and the planar metal structure layer are sequentially overlapped on the lower base plate metal layer from down to up. The metal structure layer is composed of one-dimensional or two-dimensional arrays arranged in a metal unit period, a low-leakage coherent magnetic resonance surface state formed by the metalstructure layer, the medium layer and the lower base plate metal layer in the invention controls coherence of thermal radiation, and the frequency can be adjusted by cycle length. And the coherent magnetic resonance surface state in the invention is leaked to a free space by virtue of a metal slot on the upper surface, thus the ratio of width of the metal slot to a period determines coherence length. The broadband spatial coherence thermal radiation light source provided by the invention has simple structure and low cost, is convenient to manufacture and is easy to realize.

Description

Technical field [0001] The invention relates to a thermal radiation light source with high spatial coherence for terahertz and infrared frequency bands. Background technique [0002] The spontaneous radiation generated by the thermal motion of molecules or atoms is called thermal radiation, and its radiation spectrum is related to the properties and temperature of the material. All objects are constantly radiating heat, and the most common application of heat radiation is incandescent lamps. Compared with laser monochromaticity and high directivity, people generally think that thermal radiation is an incoherent heat source in time and space, and the radiation spectrum is quite broadband, and the radiation in all directions is isotropic. The light source generally used in spectral analysis is monochromatic light. Infrared laser light source can produce coherent monochromatic light, but its cost is expensive and the frequency is generally not tunable. Therefore, a grating or a pr...

AI Technical Summary

Problems solved by technology

However, the plasma oscillation frequency of metal materials existing in nature is in the ultraviolet and visible light bands, and the plasma oscillation frequency of a few semiconductor materials is in the near infrared, which cannot achieve coherent thermal radiation at any frequency.

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