Drexhage's Experiment for Sound.
Drexhage's seminal observation that spontaneous emission rates of fluorophores vary with distance from a mirror uncovered the fundamental notion that a source's environment determines radiative linewidths and shifts. Further, this observation established a powerful tool to determine fluorescence quantum yields. We present the direct analogue for sound. We demonstrate that a Chinese gong at a hard wall experiences radiative corrections to linewidth and line shift, and extract its intrinsic radiation efficiency. Beyond acoustics, our experiment opens new ideas to extend the Drexhage experiment to metamaterials, nanoantennas, and multipolar transitions.
Center for Nanophotonics, FOM Institute AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands.
Lutz
L
Langguth
Department of Electrical and Computer Engineering, The University of Texas at Austin, 1616 Guadalupe Street, UTA 7.215, Austin, Texas 78712, USA.
Romain
R
Fleury
Center for Nanophotonics, FOM Institute AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands.|Department of Electrical and Computer Engineering, The University of Texas at Austin, 1616 Guadalupe Street, UTA 7.215, Austin, Texas 78712, USA.
Andrea
A
Alù
Center for Nanophotonics, FOM Institute AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands.
A Femius
AF
Koenderink