Sapienza Riccardo, Costantino Paola, Wiersma Diederik, Ghulinyan Mher, Oton Claudio J, Pavesi Lorenzo
European Laboratory for Nonlinear Spectroscopy and INFM, 50019 Sesto Fiorentino (Florence), Italy.
Phys Rev Lett. 2003 Dec 31;91(26 Pt 1):263902. doi: 10.1103/PhysRevLett.91.263902. Epub 2003 Dec 23.
We report on the observation of Bloch oscillations in light transport through periodic dielectric systems. By introducing a linear refractive index gradient along the propagation direction the optical equivalent of a Wannier-Stark ladder was obtained. Bloch oscillations were observed as time-resolved oscillations in transmission, in direct analogy to electronic Bloch oscillations in conducting crystals where the Wannier-Stark ladder is obtained via an external electric field. The observed oscillatory behavior is in excellent agreement with transfer matrix calculations.
我们报告了在光通过周期性介电系统传输过程中对布洛赫振荡的观测结果。通过沿传播方向引入线性折射率梯度，获得了光学等效的万尼尔 - 斯塔克阶梯。观测到的布洛赫振荡表现为透射中的时间分辨振荡，这与在导电晶体中通过外部电场获得万尼尔 - 斯塔克阶梯时的电子布洛赫振荡直接类似。观测到的振荡行为与转移矩阵计算结果非常吻合。
