Bragg Reflection Waveguide: Anti-Mirror Reflection and Light Slowdown

Abstract

The effect of the light group velocity reduction in dielectric Bragg reflection waveguide structures (SiO${}_2$/TiO${}_2$) in the vicinity of the cutoff frequency is studied experimentally. The effect of anti-mirror reflection, specific for the Bragg reflection waveguides, is described and employed for detection of "slow light". The experiments were performed with the use of the Ti:sapphire laser pulses ~ 100 fs in length. The group index $n_g\sim$ 30 with a fractional pulse delay (normalized to the pulse width) of $\sim$ 10 is demonstrated. The problems and prospects of implementation of the slow-light devices based on the Bragg reflection waveguide structures are discussed.

11 pages, in the previous version, we failed to insert figures