In this work, we use a holographic dispersed liquid crystal (HPDLC) to detect a substance added as adulterant to peppermint oil. Volume diffraction gratings are recorded in two samples of HPDLC with and without peppermint oil respectively using a Nd:YAG laser tuned at 532 nm. The adulterant is detected due to the differences obtained for the maximum diffraction efficiency, which are related to the purity of the oil.This research was funded by the Generalitat Valenciana, Spain (PROMETEO/2021/006 and IDIFEDER/2021/014, cofunded by European Union through the FEDER programme); Ministerio de Ciencia e Innovación, Spain (PID2019-106601RB-I00 and PID2021-123124OB-I00)
