“…The correlation between the frequency of the cavity mode and its bandwidth and material parameters of a liquid confined in the cavity is the basic idea behind the application of phononic crystals as a sensor platform. Lucklum et al, 2012;Zubtsov et al, 2012;Oseev et al, 2013;Salman et al, 2014;Li et al, 2015;Wang et al, 2016;Villa-Arango et al, 2017a;Villa-Arango et al, 2017b;Lucklum and Vellekoop, 2017;Oseev et al, 2017;Lucklum and Vellekoop, 2018;Villa-Arango et al, 2018;Cicek et al, 2019;Lucklum and Vellekoop, 2019;Wasmer et al, 2019 referred to recently published articles applying this methodology. We also want to refer to a different kind of PnC sensor with incidence normal on the periodic structure [ (Zubtsov et al, 2012), (Lucklum et al, 2012), (Lanoy et al, 2018)].…”