Terahertz generator based on two-dimensional material phonon mode

Abstract

The invention discloses a terahertz generator based on a two-dimensional material phonon mode. The terahertz generator comprises a low-energy broadband terahertz pulse generation device, a terahertz monochromatic radiation generator and a temperature control device used for controlling the temperature of the terahertz monochromatic radiation generator. The terahertz monochromatic radiation generator comprises a two-dimensional material layer and a high-transmission substrate, the two-dimensional material layer is loaded on the high-transmission substrate, broadband terahertz pulses emitted by the low-energy broadband terahertz pulse generation device sequentially pass through the two-dimensional material layer and the high-transmission substrate to output monochromatic terahertz radiation, and the efficient monochromatic terahertz radiation is achieved at the emitting end through the two-dimensional material layer of the terahertz generator.

Description

technical field [0001] The invention relates to the technical field of electromagnetic waves, in particular to a terahertz generator based on a two-dimensional material phonon mode. Background technique [0002] There are many ways to generate terahertz, but the more mature emission technologies are generally based on semiconductor photoconductive effect and nonlinear electro-optic crystal photorectification effect. Photoconductive technology uses dipole antenna technology to prepare semiconductor photoconductive materials (such as GaAs, InP or Si, etc.) A large number of electron-hole pairs, these excited carriers are accelerated instantaneously under the action of an external bias electric field on the antenna, generating a transient current with rapidly increasing intensity, and releasing the stored electrostatic potential energy in the form of electromagnetic pulses, And propagate to free space through the antenna structure. Another method is the light rectification me...

AI Technical Summary

Problems solved by technology

The strong scattering caused by the strong excitation in the photoconductive and inverse spin Hall effect emission mechanisms, and the various difference frequency components in the photorectification excitation pulse all make it difficult to achieve corresponding narrow-band or monochromatic terahertz radiation

In addition, the photoconductive antenna needs to prepare additional electrode structures on the basis of semiconductor materials, which increases the process complexity and cost to a certain extent; while the optical rectification effect is a nonlinear effect, a stronger laser is required to generate certain terahertz radiation excitation, and requires a large active area, which limits the integrated application of this terahertz source

These existing problems limit its application and development in corresponding key fields (such as communication, quantum computing, etc.)

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