Ma Jing, Povinelli Michelle L
Ming Hsieh Department of Electrical Engineering, University of Southern California, Powell Hall of Engineering, 3737 Watt Way, Los Angeles, CA 90089-0271, USA.
Opt Express. 2009 Sep 28;17(20):17818-28. doi: 10.1364/OE.17.017818.
We present an optomechanical method to tune phase and group birefringence in parallel silicon strip waveguides. We first calculate the deformation of suspended, parallel strip waveguides due to optical forces. We optimize the frequency and polarization of the pump light to obtain a 9 nm deformation for an optical power of 20 mW. Widely tunable phase and group birefringence can be achieved by varying the pump power, with maximum values of 0.026 and 0.13, respectively. The giant phase birefringence allows linear to circular polarization conversion within 30 microm for a pump power of 67 mW. The group birefringence gives a tunable differential group delay of 6fs between orthogonal polarizations. We also evaluate the tuning performance of waveguides with different cross sections.
我们提出了一种用于在平行硅条形波导中调谐相位和群双折射的光机械方法。我们首先计算了由于光力作用导致的悬浮平行条形波导的变形。我们优化泵浦光的频率和偏振，对于20毫瓦的光功率可获得9纳米的变形。通过改变泵浦功率可实现广泛可调的相位和群双折射，其最大值分别为0.026和0.13。对于67毫瓦的泵浦功率，巨大的相位双折射允许在30微米内实现线性到圆偏振的转换。群双折射在正交偏振之间给出了6飞秒的可调差分群延迟。我们还评估了不同横截面波导的调谐性能。
