Research / 2019 / Article / Fig 4

Research Article

Microwave Tunneling and Robust Information Transfer Based on Parity-Time-Symmetric Absorber-Emitter Pairs

Figure 4

Measurements of the amplitude transfer characteristics and reflection coefficient. (a) Forward transmission spectrum. Resonant tunneling occurs at 44.8 MHz. (b) Phase diagram of the transmission coefficient. Tunneling field experiences phase shift at resonant frequency. (c) Reflection at the input port. -50 dB reflection is observed at 44.8 MHz, indicating that the matching network works quite well. (d) Phase diagram of reflection coefficient at the input port. Measured data in a wider (20-200 MHz) and narrower (40-50 MHz) spectrum are presented in the extended data Figs. S3 and S4 in the supplementary document.