Ultra-Sensitive 2D Cancer Screening Based on Parity-Time-Symmetric Spoof Plasmonic Wave

Temperature is one of the most sensitive properties for early disease detection, especially in the current epidemic situation. High-sensitivity and flexible portable biological temperature sensors for a real-time monitor are becoming urgently reliable. Here, a parity-time (PT)-symmetric spoof plasmonic meta-waveguide (SPMW) is constructed to realize ultra-sensitive temperature sensing. This feature is owing to the ingenious configuration based on spoof plasmonic meta-waveguide and material characteristics. The PT-symmetric SPMW can be sensitively transferred from the unbroken phase to the broken phase by only varying a few percent (<3%) of ε' value of polymer-based wave-transparent material, which leads to an asymmetric transmission of the plasma wave. More importantly, compared with other devices, this sensor affords 2D visual temperature imaging, which provides the precise monitoring of large-area body temperature. The combination of 2D material, graphene, further provides impressive flexibility and robustness for the practical applications of the whole system. This finding opens an unexpected horizon for the field of ultrasensitive sensing, that points out the promising way for flexible portable wearable temperature detectors