An All-optical Modulation Method in Sub-micron Scale

Overview

Journal Sci Rep

Specialty Science

Date 2015 Mar 18

PMID 25777581

Citations 4

Authors

Longzhi Yang

Chongyang Pei

Ao Shen

Changyun Zhao

Yan Li

Xia Li

Hui Yu

Yubo Li

Xiaoqing Jiang

Jianyi Yang

Affiliations

Soon will be listed here.

Abstract

We report a theoretical study showing that by utilizing the illumination of an external laser, the Surface Plasmon Polaritons (SPP) signals on the graphene sheet can be modulated in the sub-micron scale. The SPP wave can propagate along the graphene in the middle infrared range when the graphene is properly doped. Graphene's carrier density can be modified by a visible laser when the graphene sheet is exfoliated on the hydrophilic SiO2/Si substrate, which yields an all-optical way to control the graphene's doping level. Consequently, the external laser beam can control the propagation of the graphene SPP between the ON and OFF status. This all-optical modulation effect is still obvious when the spot size of the external laser is reduced to 400 nm while the modulation depth is as high as 114.7 dB/μm.

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