Electrical Control of Broadband Terahertz Wave Transmission with Two-Terminal Graphene Oxide Devices

TL;DR

This paper demonstrates that graphene oxide-based two-terminal devices can effectively modulate broadband terahertz wave transmission at room temperature through electrically trapped charge carriers, offering a simple solution-printed active photonic component.

Contribution

It introduces a novel graphene oxide device architecture for broadband THz modulation, leveraging localized impurity states for effective control.

Findings

Achieved ~30% modulation of THz transmission amplitude.

Observed hysteretic behavior confirming charge trapping effects.

Device fabrication via simple solution printing.

Abstract

Carbon nanomaterials such as carbon nanotubes and graphene have proved to be efficient building blocks for active optoelectronic devices. Especially, the exotic properties of crystalline graphene, such as a linear/gapless energy dispersion, offer a generic route to the development of active photonic modulator at the infrared (IR) and terahertz (THz) regime with large modulation depth. Here, we show that graphene oxide (GO), an oxygenated derivative of graphene with randomly distributed molecular defects (e.g., adsorbed water molecules and punched holes), can provide a different way to effectively control broadband THz transmission amplitude, when incorporated into two-terminal electrode devices. Electrically trapped charge carriers within localized impurity states (LIS) of GO, which originate from fully randomized defective structure of GO, results in a large modulation of transmission amplitude (~30%) for broadband THz waves (0.3 ~ 2.0 THz) even at room temperature. Interesting hysteretic behavior observed in the control of broadband THz transmission further confirms the key role of trapped charge carriers in switching of broadband THz waves. The device architecture constructed by simple solution printing of GO onto the two-terminal electrode enables easy-to-implement active photonic devices.