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We investigated the interactions among unperturbed-basis modes in an asymmetrical-deformed optical microcavity. We found that the coupling strength is enhanced when the angular mode number difference of interacting modes equals an integer multiple of the number of the chain islands. We could explain this phenomenon by applying the theory of resonance-assisted tunneling (RAT) to our microcavity system.
Output directionality of asymmetric optical microcavities has been widely studied revealing many interesting features. Especially the tunneling emission is now attracting many interests due to the unexpected features in the semiclassical model. We found that the tunneling emission pattern in the far-field region can be reconstructed from the outside-outgoing Husimi function corresponding to the critical...
We have studied circular shell ultrasonic cavities immersed in water in both theory and experiment. Calculations show that there exist two types of modes (mainly residing in the inner cavity and in the shell, respectively) and they interact with each other via the coupling across the inner boundary. We have experimentally confirmed this by using the schlieren method.
We have performed boundary-element-method (BEM) simulations in a ultrasonic cavity. To confirm the accuracy of our BEM calculation, the BEM results obtained for a circular cavity were compared with the analytic solutions for the same cavity. In the simulation results, we found that the imaginary part of the resonance frequency shows different aspects from that of a corresponding optical microcavity.
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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