Lamb wave acousto-optic modulator in ZnO/MgO multiple quantum wells and comparison with classical modulator.

Applied optics

PubMedID: 26479819

Gryba T, Lefebvre JE, Elmaimouni L, Ratolojanahary FE. Lamb wave acousto-optic modulator in ZnO/MgO multiple quantum wells and comparison with classical modulator. Appl Opt. 2015;54(29):8786-94.
An analysis of a ZnO/MgO multiple quantum well (MQW) acousto-optic modulator with Lamb waves is performed. With the MQW thickness in the range of 0. 2 times the Lamb wavelength, the only observed Lamb modes are the lowest-order symmetric S0 and antisymmetric A0 modes. These modes induce strain and electric field components which influence the absorption coefficient of the modulator by the associated variation of the excitonic energies of MQW. The optical absorption coefficient spectra of the modulator as a function of the Lamb waves' power is presented. The Lamb-wave-based modulator gives a better absorption coefficient than the Rayleigh-wave-based one. An analysis of a classical acousto-optic modulator is also performed for comparison of performance.