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We employ an ultrasonic acoustic cavity in which the pressure field satisfies the same form of Helmholtz equation as the optical field in an optical microcavity of much interest, where many interesting features of mode distributions are expected but difficult to observe directly. Mode patterns in an acoustic cavity are measured with the Schlieren method, not perturbing the mode distributions at all...
The spatial mode patterns in an optical microcavity reveal many interesting feature. However, it is not possible to measure these mode patterns directly in most cases. To supplement this limitation, we employ acoustic cavities equivalent to the optical cavities of interest. The pressure field distribution there can be measured using the Schlieren method. We observed chaotic and scar modes in a center-displaced...
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