Gain negative refractive index material based on tunnel diode

Abstract

The invention discloses a gain negative refractive index material based on a tunnel diode. The material comprises a metal structure, the tunnel diode and a dielectric substrate, wherein the metal structure comprises an electric resonance unit and a magnetic resonance unit; the electric resonance unit is a sub-wavelength metal copper column laid in the middle position of the back of the dielectricsubstrate; and the magnetic resonance unit is a square open resonant ring and is laid flatly on the front of the dielectric substrate, a gap is formed in the middle position of the upper border of aninner ring, namely the position opposite to the opening direction of the inner ring, and the tunnel diode is welded in the gap. The material is a single-layer artificial medium unit combining a sub-wavelength electric resonance and magnetic resonance dipole structure; starting from the intrinsic causality of electromagnetic wave energy conservation, introduction of a microwave negative resistancedevice to a traditional artificial medium unit is systematically studied, a method capable of simultaneously regulating and controlling a real part and an imaginary part of equivalent constitutive parameters of an artificial microwave gain medium is obtained, and the artificial microwave medium having a gain and a negative refractive index simultaneously is obtained.

Description

technical field [0001] The invention belongs to the research field of microwave gain media, in particular to a tunnel diode-based gain negative refractive index material. Background technique [0002] Artificial electromagnetic media have attracted great interest due to their supernatural electromagnetic properties, such as subwavelength imaging and invisibility cloaks. Although artificial electromagnetic media can be used in novel applications such as negative refraction, perfect imaging, and electromagnetic stealth in principle, their inherent dispersion loss and inherent resonance characteristics make the above applications impossible to be effectively realized. [0003] To overcome this obstacle, researchers have conducted extensive studies on gain-compensated artificial media. Among them, M.I.Stockma and others theoretically analyzed the possibility of using active methods to achieve gain artificial media based on the law of causality, and expressed pessimism about whe...

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Problems solved by technology

But so far, there is no report on the microwave band active medium that combines the characteristics of optical gain medium and negative refractive index artificial medium.

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