Issue 27, 2020

Sandwiched graphene/hBN/graphene photonic crystal fibers with high electro-optical modulation depth and speed

Abstract

Graphene-photonic crystal fibers (PCFs) are obtained by integrating the broadband optical response and electro-optic tunability of graphene with the high-quality waveguide capacity and easy-integrability of the PCF, and this has been proven to be an important step towards multimaterial multifunctional fiber and all-fiber integrated circuits. However, the reported electro-optic modulator based on directly-grown graphene-PCF suffers from very low response speed (below 100 Hz) due to the slow response of ionic liquid. Here, we propose new functional PCFs with a sandwiched graphene/hBN/graphene (Gr/hBN/Gr) film attached to the hole walls of the fibers, and theoretically demonstrate that the in-line modulator based on it can achieve simultaneous single-mode transmission ranging from 1260 nm to 1700 nm (covering all optical communication bands), significant modulation depth (e.g. ∼42 dB mm−1 at 1550 nm) and high modulation speed (up to ∼0.1 GHz). Furthermore, various device functions can be designed by changing the structure of the fiber, including the length, the hole diameter and the layer numbers of graphene and hBN films. This proposed approach directs a viable path to obtain high-performance all-fiber devices based on hybrid two-dimensional material optical fibers.

Graphical abstract: Sandwiched graphene/hBN/graphene photonic crystal fibers with high electro-optical modulation depth and speed

Supplementary files

Article information

Article type
Communication
Submitted
26 Apr 2020
Accepted
22 Jun 2020
First published
24 Jun 2020

Nanoscale, 2020,12, 14472-14478

Sandwiched graphene/hBN/graphene photonic crystal fibers with high electro-optical modulation depth and speed

X. Cheng, X. Zhou, L. Tao, W. Yu, C. Liu, Y. Cheng, C. Ma, N. Shang, J. Xie, K. Liu and Z. Liu, Nanoscale, 2020, 12, 14472 DOI: 10.1039/D0NR03266B

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