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Open AccessArticle

Electrical Phase Control Based on Graphene Surface Plasmon Polaritons in Mid-infrared

1
Key Laboratory for Wide Band Gap Semiconductor Materials and Devices of Education Ministry, School of Microelectronics, Xidian University, Xi’an 710071, China
2
Beijing Smart-Chip Microelectronics Technology Co., Ltd. Beijing 100192, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(3), 576; https://doi.org/10.3390/nano10030576
Received: 7 February 2020 / Revised: 19 March 2020 / Accepted: 20 March 2020 / Published: 22 March 2020
(This article belongs to the Special Issue 2D Materials and Their Heterostructures and Superlattices)
Phase modulation of light is the core of many optoelectronic applications, such as electro-optic switch, sensors and modulators. Graphene Surface plasmon polaritons (SPPs) exhibit unique properties in phase modulation including dynamic tunability, a small driving voltage and small device size. In this paper, the novel phase modulation capability of graphene SPPs in mid-infrared are confirmed through theory and simulation. The results show that graphene SPPs can realize continuous tuning of the phase shift at multiple wavelengths in mid-infrared, covering the phase range from 0° to 360°. Based on these results, a sandwich waveguide structure of dielectric–graphene–dielectric with a device length of 800 nm is proposed, which shows up to 381° phase modulation range at an operating wavelength of 6.55 µm, given a 1 V driving voltage. In addition, the structure size is much shorter than the wavelength in mid-infrared and can realize sub-wavelength operation. This work paves the way to develop graphene-based tunable devices for mid-infrared wave-front control. View Full-Text
Keywords: grapheme surface plasmon polaritons; phase modulation; Mid-infrared grapheme surface plasmon polaritons; phase modulation; Mid-infrared
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MDPI and ACS Style

Wang, Y.; Liu, H.; Wang, S.; Cai, M.; Zhang, H.; Qiao, Y. Electrical Phase Control Based on Graphene Surface Plasmon Polaritons in Mid-infrared. Nanomaterials 2020, 10, 576.

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