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Polarization-dependent reflectivity measurements were carried out over abroad frequency range on single-crystalline ZrGeSe and ZrGeS compounds, whichare closely related to the prototype nodal-line semimetal ZrSiS. Thesemeasurements revealed the strongly anisotropic character of both ZrGeSe andZrGeS, with a reduced plasma frequency for the out-of-plane direction {\bfE}$\| c$ as compared to the in-plane direction {\bf E}$\| ab$. For {\bf E}$\|ab$ the optical conductivity spectrum consists of two Drude terms followed by ashoulder or plateau-like behavior and a distinct U shape at higher energies,while for {\bf E}$\| c$ one Drude term is followed by a peak-like behavior andthe U shape of the profile is less developed. Under external pressure, twoprominent excitations appear in the out-of-plane optical conductivity spectrumof ZrGeSe, whose frequency position and oscillator strength show a weak anomalyat $\sim$3~GPa. Overall, the pressure-induced changes in the profile of the{\bf E}$\| c$ conductivity spectrum are much enhanced above $\sim$3~GPa. Wecompare our results to those recently reported for ZrSiS in a quantitativemanner.

In-plane and out-of-plane optical response of the nodal-line semimetals ZrGeS and ZrGeSe