Heavily doped semiconductor-based broadband terahertz absorber

Abstract

The invention discloses a heavily doped semiconductor-based broadband terahertz absorber, which is formed by a two-layer structure, wherein a top layer is formed by a circular ring and a cylinder; a substrate is a cube; used materials for the broadband terahertz absorber all are highly doped semiconductors of the same doping concentration; and a plasma material is formed through heavy doping on aterahertz band on the basis of a silicon material, thereby achieving the characteristic that electromagnetic waves entering the surface of the structure are almost completely absorbed. The heavily doped semiconductor-based broadband terahertz absorber has the characteristics of being simple in structure, free of multiple layers of materials for stacking, convenient to process, insensitive in polarization, high in absorption efficiency, relatively wide in absorption band and wide-angle in absorption, and can basically meet the application requirements for the terahertz absorption aspect.

Description

technical field [0001] The invention belongs to a broadband terahertz absorber based on highly doped semiconductors, and belongs to the application field of highly doped semiconductors in the terahertz band. Background technique [0002] Terahertz waves are between microwave and infrared light in the electromagnetic spectrum, and the wavelength is usually 30 μm ~ 3mm. Terahertz waves include electromagnetic waves with frequencies between 0.1 and 10 THz. Terahertz radiation has long been considered safer radiation, especially compared to X-rays. It can penetrate many commonly used dielectric materials such as paper, leather, plastic, wood, etc., and because of its relatively low photon energy, it will not cause obvious damage to organisms, so terahertz waves are widely used in semiconductors; Medical science; national defense security and information technology and other fields. However, in some fields, it is still necessary to avoid the influence of terahertz radiation, so...

AI Technical Summary

Problems solved by technology

[0003] With the development of modern information warfare, the research of terahertz absorber has attracted more and more attention. Terahertz absorber refers to a device that can absorb most of the energy of the incident terahertz band electromagnetic wave and convert the energy into Other forms of energy can achieve a class of special materials with almost no reflection. In 2014, W Withayachumnankul et al. developed a broadband terahertz absorber based on highly doped semiconductors, and described in detail the advantages of using semiconductors as absorbers , although the existing reports on terahertz wave absorbers have good absorbing properties, they can only perform narrow-band absorbing at single or multiple resonance points, and cannot achieve broadband or even ultra-broadband absorbing effects.

Images