论文部分内容阅读
目前人们已经实现了很高的调制深度,但是缺少对如何实现调制深度可调的研究,不利于实现波整形。利用石墨烯的电调谐性以及石墨烯超材料的表面等离激元(SPP)共振特性,设计了一种能够在某一频率实现调制深度可调的调制器,且调制深度为极大值,便于取样及检测,并运用谐振子模型对透射规律进行了理论分析。基于三维电磁场仿真软件时域求解器仿真,得到了对应频率为11.85THz的一系列的调制深度,其中最大调制深度可达到96%以上。这一系列的调制深度可以通过电压调节石墨烯的费米能级来进行调制转换,将极大地促进调制器在波整形中的应用,如生成正弦波、三角波及方波等。此外,这种结构可以实现类电磁感应透明(EIT)现象,不仅能够实现透射峰的频移和展宽,而且可以使展宽前后的中心频率保持一致。
At present, people have realized a very high modulation depth, but there is a lack of research on how to adjust the modulation depth, which is not conducive to wave shaping. Based on the electric tuning of graphene and the surface plasmon resonance (SPP) of graphene metamaterials, a modulator with adjustable modulation depth at a certain frequency is designed and the modulation depth is maximum. It is convenient for sampling and testing, and the theory of transmission is theoretically analyzed by using harmonic oscillator model. Based on the time-domain solver simulation of three-dimensional electromagnetic field simulation software, a series of modulation depths corresponding to a frequency of 11.85 THz were obtained, of which the maximum modulation depth was up to 96%. This series of modulation depth can be modulated by voltage regulation graphene Fermi level, which will greatly promote the modulator in wave shaping applications, such as the generation of sine wave, triangle wave and square wave. In addition, this structure enables electromagnetic induced transparency (EIT) phenomenon, which not only can achieve the shift and broadening of the transmission peak, but also can make the center frequency before and after broadening consistent.