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.
© 2013 Optical Society of America
Original Manuscript: July 2, 2013
Revised Manuscript: September 8, 2013
Manuscript Accepted: September 10, 2013
Published: October 7, 2013
Jin-Chen Hsu, Chiang-Hsin Lin, Yun-Cheng Ku, and Tzy-Rong Lin, "Photonic band gaps induced by submicron acoustic plate waves in dielectric slab waveguides," Opt. Lett. 38, 4050-4053 (2013)