A. Kamarauskas, L. Staišiūnas, D. Seliuta, G. Šlekas, Ž. Kancleris
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引用次数: 0
摘要
在这里,我们提出了一种电压控制法布里-珀罗调制器,它由两片重叠的石墨烯片组成,中间用氧化铪层隔开,在硅衬底上制造而成。外加电压会改变两层石墨烯的费米级,从而改变总表面电导率。这反过来又改变了系统的光学参数。由于调制器的结构,50% 的太赫兹功率被吸收,外加电压控制着反射和透射之间的比率。在共振频率为 414 GHz 时,通过法布里-珀罗调制器的传输可在 -1.5 至 10 V 的电压范围内成倍降低。所提出的多层结构可以在任何太赫兹透明基底上制造,与光刻和原子层沉积(ALD)工艺兼容。
Here we propose a voltage-controlled Fabry–Perot modulator made of two overlapping graphene sheets separated by a hafnium oxide layer, manufactured on a silicon substrate. The applied voltage shifts the Fermi level in both layers thus changing the total surface conductivity. This in turn changes the optical parameters of the system. Due to the architecture of the modulator, ≈50% of THz power is absorbed and the applied voltage controls the ratio between the reflection and transmittance. At the resonance frequency of 414 GHz, the transmission through the Fabry–Perot modulator can be doubly reduced in a voltage range of –1.5 to 10 V. In DC measurements, it is revealed that the electrical properties of graphene sheets dramatically depend on the technological process. The proposed multilayer structure can be manufactured on any THz-transparent substrate, compatible with photolithography and atomic layer deposition (ALD) processes.Voltage-controlled surface conductivity could find its application in sensing or modulation of electromagnetic waves.
期刊介绍:
The main aim of the Lithuanian Journal of Physics is to reflect the most recent advances in various fields of theoretical, experimental, and applied physics, including: mathematical and computational physics; subatomic physics; atoms and molecules; chemical physics; electrodynamics and wave processes; nonlinear and coherent optics; spectroscopy.