Queensland University of Technology provides funding as a member of The Conversation AU. When an ambulance passes with its siren blaring, you hear the pitch of the siren change: as it approaches, the ...

Scientists have detected the Doppler effect — a quirk of physics that makes an ambulance's siren change pitch as it drives by — on the scale of a single molecule. The Doppler effecthas been understood ...

Figure 1: Illustration of the rotational Doppler effect in the linear and nonlinear optical regime. Compared with the rapid development and applications of the rotational Doppler effect in linear ...