Applied Nanophotonics, Liquid Crystals and Biomedical Optics

We report on strong effects of uniaxial stress applied on in-fiber grating. Under the stress, the reflection peak splits because of the elasto-optically induced birefringence. The separation between the two peaks increases with the stress, and they broaden and shift. By modulating the pressure using a PZT disc at frequencies up to 1 MHz, we obtained modulation of the reflectivity, which varies with the wavelength within the grating reflection band.