Abstract
Phoxonic crystals, which exhibit simultaneous phononic and photonic bandgaps, are promising artificial materials for optomechanical and acousto-optical devices. In this paper, simultaneous guidance of surface acoustic and surface optical waves in truncated phoxonic crystal slabs with veins is investigated using the finite element method. The phoxonic crystal slabs with veins can show dual large bandgaps of phononic and photonic even/odd modes. Based on the phononic and photonic bandgaps, simultaneous surface acoustic and optical modes can be realized by changing the surface geometrical configurations. Both acoustic and optical energies can be highly confined in the surface region. The effect of the surface structures on the dispersion relations of surface modes is discussed; by adjusting the surface geometrical parameters, dual single guided modes and/or slow acoustic and optical waves with small group velocity dispersions can be achieved. The group velocities are about 40 and 10 times smaller than the transverse velocity of the elastic waves in silicon and the speed of light in vacuum, respectively.
Highlights
Phoxonic crystals (PXCs) have gained particular interest owing to their possibility of simultaneously manipulating light and sound for more than ten years [1]
The PXCs possess photonic bandgaps (PTBGs) and phononic bandgaps (PNBGs) simultaneously, which prohibit the propagation of photons and phonons, respectively
Several structures have been studied in order to demonstrate the opening of simultaneous PTBGs and PNBGs [4,5,6,7,8,9]
Summary
Phoxonic crystals (PXCs) have gained particular interest owing to their possibility of simultaneously manipulating light and sound for more than ten years [1]. Psarobas et al [24] reported that a strong AO interaction occurs when acoustic and optical resonant modes are simultaneously confined in a 1D PXC cavity to motivate multi-phonon exchange. Engineering of SOWs can be useful for the manipulation of light at the surface of PTCs; so far, various applications such as cavities [30], waveguides [31], collimated emissions [32] and sensors [33] have been demonstrated. SOWs and surface acoustic waves (SAWs) can be simultaneously obtained in a truncated PXC slab. We investigate the phononic and photonic surface modes in truncated PXC slabs.
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