ICFO-Institut de Ciencies Fotoniques, and Universitat Politecnica de Catalunya, Mediterranean Technology Park,08860 Castelldefels (Barcelona), Spain.
Phys Rev Lett. 2010 Jul 16;105(3):033901. doi: 10.1103/PhysRevLett.105.033901. Epub 2010 Jul 13.
We put forward a new approach to generate stable, fully three-dimensional light bullets, which is based on the matching of the intrinsic material dispersion with a suitable effective diffraction. The matching is achieved in adequate waveguide arrays whose refractive index is periodically modulated along the direction of light propagation. We show that by using nonconventional, out-of-phase longitudinal modulation of the refractive index of neighboring channels, it is possible to tune the effective diffraction to match the intrinsic material group velocity dispersion. Three-dimensional light bullets are shown to form at reduced energy levels, in settings where the dispersion would be far too weak to generate bullets in the absence of array.
我们提出了一种新的方法来产生稳定的、全三维的光子弹，该方法基于内在材料色散与合适的有效衍射的匹配。这种匹配是在折射率沿光传播方向周期性调制的适当波导阵列中实现的。我们表明，通过使用相邻通道折射率的非传统、反相纵向调制，可以调整有效衍射以匹配内在材料群速度色散。在没有阵列的情况下，由于色散太弱而无法产生光子弹的情况下，在降低的能量水平下可以形成三维光子弹。
