Mitigating Electrode-Induced Polarization Artifacts in Miniaturized Terahertz Detectors via a Ring-Shaped Electrode Design
State Key Laboratory of Optoelectronic Materials and Technologies（光电功能材料国家重点实验室）；Guangdong Province Key Laboratory of Display Material and Technology（广东省显示材料与技术重点实验室）；School of Electronics and Information Technology, Sun Yat-sen University（中山大学电子与信息工程学院）
Terahertz (THz) polarization detection provides critical insights into material properties but faces a fundamental constraint upon miniaturization: subwavelength metallic electrodes induce strong localization and distortion of the incident field, thereby convoluting the intrinsic device response with electrode-induced artifacts. Here, we overcome this limitation with a ring-shaped electrode architecture that suppresses field perturbations across a broad bandwidth from 2.0 to 5.0 THz. The resonant frequency of the ring electrode can be flexibly detuned from the target operation frequency by adjusting its inner and outer radii, while the smooth, edge-free geometry minimizes the lightning-rod effect. These design features collectively lead to a pronounced suppression of localized THz field enhancement. Numerical simulations reveal an 8.48x reduction in the local field strength compared with conventional rod-shaped electrodes. Consistent with this, experimental measurements on graphene-based detectors exhibit a 6.95x decrease in photocurrent for the ring-shaped electrode relative to the rod-shaped configuration. Moreover, the ring geometry effectively reduces the linear polarization ratio of the photocurrent from >3 to <1.4, confirming its effectiveness in mitigating electrode-induced polarization anisotropy. Our design decouples the detection response from electrode-induced artifacts, enabling compact THz detectors that preserve intrinsic signal fidelity for high-quality polarization-resolved imaging and diagnostics.
A two-dimensional terahertz smart wristband for integrated sensing and communication
State Key Laboratory of Optoelectronic Materials and Technologies（光电功能材料与技术国家重点实验室）；Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University（中山大学电子与信息工程学院，显示材料与技术广东省重点实验室）
Deep-Subwavelength Plasmon Polariton Atomic Cavity Detector for Frequency- and Polarization-Sensitive Terahertz Detection and Imaging
State Key Laboratory of Optoelectronic Materials and Technologies（光电信息材料与技术国家重点实验室）；Guangdong Province Key Laboratory of Display Material and Technology（广东省显示材料与技术重点实验室）；School of Electronics and Information Technology（电子与信息学院）；Sun Yat-sen University（中山大学）
