“…Phononic crystals (PnCs) have received increasing attention in the last two decades as an analogue of photonic crystals (PtCs). [1,2,3,4,5,6,7,8] Coupling modes have been investigated in both PnCs [9,10,11,12,13,14] and PtCs [15,16,17,18,19], exhibiting features such as energy transferring [10,11,16], absorption [9,12], wave confinement [16] and frequency modulation [13]. Most of the research is based on the cavity/waveguide [10,16,13], cavity/cavity [18,13] or waveguide/ waveguide [11] systems.…”