Inducing forced and auto-oscillations in one-dimensional photonic crystals with light

Meritorious AutonomousUniversityofPuebla,PhysicsandMathematicsSciencesDepartment,Avenue San Claudio y Rio Verde, Col. San Manuel, Puebla 72570, MexicoAbstract. We induced forced and auto-oscillations in one-dimensional photonic crystals (1-D-PCs) with localized defects when light impinges transversally to the defect layer. The photonicstructure used consists of a microcavity-like structure formed of two 1-D-PCs made of free-standing porous silicon, separated by a variable air gap (the defect) and the working wavelengthis633nm.Theforcegenerationwasmadeevidentbydrivingalaserlightbymeansofachopper;thelighthitthephotonicstructureandinducedavibrationandthevibrationwascharacterizedbyusing a very sensitive vibrometer. For example, we measured peak displacements and velocitiesranging from 2 to 167 μm and 0.4 to 2.1 mm∕s with a power light level from 2.6 to 13 mW. Incomparison, recent evidence showed that giant resonant light forces could induce averageveloc-ity values of 0.45 mm∕s in microspheres embedded in water with a 43-mW light power.