Graphene photonic crystal terahertz amplifier

Abstract

The invention discloses a graphene photonic crystal terahertz amplifier and a regulating and control method thereof. Due to the characteristics that the conductivity of graphene at specific temperature and bias voltage is a negative value in a terahertz wave band, the graphene can be used as a terahertz wave gain medium, and the function of the terahertz amplifier can be achieved by using a periodic 'graphene-single crystal silicon layer' one-dimensional photonic crystal structure. According to the graphene photonic crystal terahertz amplifier, different bias voltages can be applied by alternatively introducing positive and negative electrodes to the graphene which is periodically arranged, and active regulation and control on terahertz wave amplification and working frequency are achieved. As the one-dimensional photonic crystal structure is combined with the terahertz gain characteristics of the graphene, due to the cascade connection of a plurality of pieces of graphene, and the photonic band gap, the slow light enhancement, the F-P effect and the mode competitive effect of the one-dimensional photonic crystal structure, the gain amplification coefficient and the Q-value of the terahertz waves in a single transmission mode can be effectively increased, and the single-frequency terahertz wave output with the high gain and high Q-value is achieved. The graphene photonic crystal terahertz amplifier works in a frequency band of 1-2THz, the working frequency can be tuned according to working voltage, the maximum output gain is greater than 30dB, the Q-value is greater than 50, and the graphene photonic crystal terahertz amplifier is a large-format high-performance terahertz amplifier.

Description

technical field [0001] The invention belongs to the field of terahertz science and technology, and in particular relates to a terahertz wave amplifier and a working method thereof. Background technique [0002] Terahertz wave refers to the frequency between 0.1-10THz (1THz=10 12 THz, corresponding to electromagnetic waves with a wavelength in the range of 3 mm to 30 μm, this band is between microwaves and light waves, and is an intersecting field between electronics and photonics. Due to its special position in the electromagnetic spectrum, terahertz waves have many superior characteristics such as perspective, safety, and high signal-to-noise ratio, and have very important academic and application values ​​in the fields of spectroscopy, imaging, and communication. However, the energy conversion efficiency of existing terahertz radiation sources is low, and the radiation power is very limited, which has become the primary bottleneck restricting the development of terahertz ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a graphene photonic crystal terahertz amplifier, which solves key technical problems such as low gain, small Q value, small tuning range, and low pump conversion efficiency of the terahertz amplifier in the background technology.

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