Institute of Communications Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu, 30050, Taiwan.
Center for mmWave Smart Radar Systems and Technologies, National Chiao Tung University, Hsinchu, 30050, Taiwan.
Sci Rep. 2021 Jan 21;11(1):1999. doi: 10.1038/s41598-021-81595-9.
A surface plasmon resonance (SPR) sensor based on gate-controlled periodic graphene ribbons array is reported. Different from the conventional methods by monitoring reflectivity variations with respect to incident angle or wavelength, this approach measures the change in SPR curve against the variation of graphene chemical potential (via dynamically tuning the gate voltage) at both fixed incident angle and wavelength without the need of rotating mirror, tunable filter or spectrometer for angular or wavelength interrogation. Theoretical calculations show that the sensitivities are 36,401.1 mV/RIU, 40,676.5 mV/RIU, 40,918.2 mV/RIU, and 41,160 mV/RIU for analyte refractive index (RI) equal to 1.33, 1.34, 1.35 and 1.36; their figure of merit (1/RIU) are 21.84, 24, 23.74 and 23.69, respectively. Significantly, the enhancement in the non-uniform local field due to the subwavelength graphene ribbon resonator can facilitate the detection in redistribution of protein monolayers modeled as dielectric bricks.
本文报道了一种基于栅控周期性石墨烯带阵列的表面等离子体共振（SPR）传感器。与传统的通过监测相对于入射角或波长的反射率变化的方法不同，该方法通过在固定入射角和波长下，通过动态调整栅极电压来测量 SPR 曲线对石墨烯化学势变化的变化，而无需旋转镜、可调滤波器或光谱仪进行角度或波长询问。理论计算表明，对于分析物折射率（RI）分别等于 1.33、1.34、1.35 和 1.36 的情况，灵敏度分别为 36401.1 mV/RIU、40676.5 mV/RIU、40918.2 mV/RIU 和 41160 mV/RIU；它们的品质因数（1/RIU）分别为 21.84、24、23.74 和 23.69。值得注意的是，由于亚波长石墨烯带谐振器的非均匀局域场增强，可以促进对作为介电砖的蛋白质单层再分布的检测。
