Parallel Measurements of Vibrational Modes in a Few-Layer Graphene Nanomechanical Resonator Using Software-Defined Radio Dongles

Software-defined radio dongles are small and inexpensive receivers well known to amateur enthusiasts. When connected an antenna, they enable monitoring of a wide range the spectrum by conditioning input signal transferring downconverted version it personal computer for software processing. Here, we employ composite two such dongles, interfaced with codes written in MATLAB GNU Radio, as measuring instrument study flexural vibrations few-layer graphene nanomechanical resonator. Instead connect split output photodetector used detect optically. We first perform quantitative analysis dynamics vibrational mode. then measure response modes parallel. To illustrate our technique, changes amplitude both induced periodic strain modulation delay ≈1 ms between measurements. Last, show that software-based can be employed demodulate human voice encoded For parallel measurements several frequency channels, provided is not too weak, system may offer alternative use multiple lock-in amplifiers or analyzers, distinct advantage being cost-effective per channel.