High-frequency acousto-optic effects in Bragg reflectors
Farmer, D.J. and Akimov, Andrey V. and Gippius, N.A. and Bailey, James and Sharp, James S. and Kent, Anthony (2014) High-frequency acousto-optic effects in Bragg reflectors. Optics Express, 22 (12). pp. 15218-15231. ISSN 1094-4087
Picosecond acoustic interferometry was used to study the acousto-optic properties of a distributed Bragg reflector (DBR) manufactured from two immiscible polymers (cellulose acetate and polyvinylcarbyzole). Picosecond strain pulses were injected into the structure and changes in its reflectance were monitored as a function of time. The reflectance exhibited single-frequency harmonic oscillations as the strain pulse traversed the DBR. A transfer matrix method was used to model the reflectance of the DBR in response to interface modulation and photo-elastic effects. This work shows that photo-elastic effects can account for the acousto-optic response of DBRs with acoustically matched layers.
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