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The glass is a disordered solid that processes distinct dynamical and elasticproperties compared with crystal. How heterogeneous glassy materials can be andto what extent dynamics is encoded with structure and elasticity arelong-standing puzzles in glass science. In this experiment, we probed theresponses of binary colloidal glasses towards the excitations induced by highlyfocused laser pulses. We observed very similar excitation patterns when thelaser was repeated in the linear region; directly proving that the dynamicalheterogeneity is strongly encoded with structure. In the non-linear region, weidentified a non-monotonic dynamical length scale as a function of areafraction, resulting from the non-monotonic coupling of momentum transfer inradial and orthogonal directions. Surprisingly, the excitation size and radiusof gyration conformed to a universal scaling relation that covered both linearand non-linear regions. Our experiments offered a new strategy of activelyprobing the response of glassy materials on the microscopic level.

Probing the Local Response of Glass-forming Liquids by Laser Excitations