The concept of phonitons was introduced in research conducted by Soykal et al. In their study, they explore the possibility of realizing these hybrid objects based on sound and matter. By investigating strained silicon systems, the authors identify low-lying donor transitions that can be driven solely by acoustic phonons at wavelengths suitable for constructing high-Q phonon cavities. The strongly coupled regime of the phonon-matter resonance is achieved, surpassing the thresholds of spontaneous phonon emission, phonon leakage, anharmonicity, and scattering. The proposed micropillar distributed Bragg reflector Si/Ge cavity demonstrates the feasibility of achieving high-Q factors and small mode volumes.