Opt Lett. 2013 Oct 15;38(20):4050-3. doi: 10.1364/OL.38.004050.
We generate photonic bandgaps (PBGs) in dielectric slab waveguides by exciting their acoustic plate eigenmodes of submicron wavelength. We investigate the optical forbidden bands below the light line where the slab interfaces and index of refraction are periodically modulated by the acoustic fields. Results show that multiple scattering through the enhanced periodic acousto-optic (AO) interaction opens Bragg PBGs. A tunable bandgap width and transmittance are achieved. Transmitted optical waves are found to incur strong nonlinear modulation through AO interaction by a multiphonon exchange mechanism. The applications include tunable optomechanical and AO devices.
我们通过激发亚微米波长的介电平板波导的声板本征模式来产生光子带隙 (PBG)。我们研究了光线下方的光学禁带，在该禁带中，平板界面和折射率通过声场周期性调制。结果表明，通过增强的周期性声光 (AO) 相互作用的多次散射可以打开布拉格 PBG。可以实现可调谐的带隙宽度和透过率。通过多声子交换机制，发现通过 AO 相互作用的传输光会产生强烈的非线性调制。其应用包括可调谐的光机械和声光器件。
