Multidirectional tunable wave resonators

Recently [Proc. SPIE 6422, 64220P (2007)] we proposed the construction of electromagnetic and electronic multicavity resonators using chaotic two-dimensional waveguides. In this paper we go one step further and design multidirectional tunable wave resonators. We use waveguides formed by a linear array of coupled cavities whose geometrical parameters are chosen to produce mixed phase space. The islands of stability in the phase space induce the formation of quasi-bound states whose structure in real space determines the directionality of the resonator. To form the waveguide we choose cavities with different geometrical parameters (different phase space), so that different quasi-bound states can be excited in the same waveguide resonator by properly tuning the excitation frequency/energy.