Affiliation:
1. State Key Laboratory for Information Photonics and Optical Communications School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing 100876 China
2. Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Natural Materials & Micro‐nano Devices Renmin University of China Beijing 100872 China
3. National Key Laboratory of Solid‐State Microwave Devices and Circuits Hebei Semiconductor Research Institute Shijiazhuang 050051 China
Abstract
AbstractThe free‐space optical communication is regarded as a promising technique for next generation networks. However, all the data are exposed in free space with high risk of being attacked or eavesdropping by unauthorized parties. Here, a bipolar photodetector based on the graphene/GaN heterojunction is demonstrated. The polarity of the UV light photocurrent is opposite to that of the red light photocurrent, which results from the interface state filling effect and hot carrier injection into graphene, verified by Kelvin probe force microscope measurement results. Four stable photocurrent levels are demonstrated with only a single graphene/GaN heterojunction via the photocurrent polarity control, which is employed for a secure capability in conventional optical communication by setting visible and UV light as secret and key information, respectively. The technique provides a new strategy to design photodetectors for information encryption technology.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Hebei Province Outstanding Youth Fund
Subject
Electronic, Optical and Magnetic Materials
Cited by
10 articles.
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