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We suggest a novel approach for probing of local fluctuations of therefractive index $n$ in solids by means of single-molecule (SM) spectroscopy.It is based on the dependence $T_1(n)$ of the effective radiative lifetime$T_1$ of dye centres in solids on $n$ due to the local field effects. Detectionof SM zero-phonon lines at ultra-low temperatures gives the values of SMnatural spectral linewidth (which is inverse proportional to $T_1$) and makesit possible to reveal the distribution of the local $n$ values in solids. Herewe demonstrate this possibility on the example of amorphous polyethylene andpolycrystalline naphthalene doped with terrylene.

Single-molecule spectromicroscopy: the door into sub-diffraction refractometry