All optical reconfiguration of optomechanical filters
All optical reconfiguration of optomechanical filters
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DOI：
10.1038/ncomms1830
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发表时间：
2012-05-01
影响因子：
16.6
通讯作者：
Loncar, Marko
中科院分区：
文献类型：
--
作者：
Deotare, Parag B.;Bulu, Irfan;Loncar, Marko
可重构光学滤波器在光通信和信息处理中具有重要的应用。特别感兴趣的是利用设备的机械变形的调谐技术，因为它们提供更宽的调谐范围。在这里，我们展示了重新配置的耦合光子晶体纳米梁腔通过使用光学梯度力诱导的机械驱动。存在于宽波长范围内的振荡波导模式用于致动结构并控制局部腔模式的谐振。使用这种全光学方法，超过18线宽的调谐范围被证明。使用一个芯片上的温度自参考的方法，我们确定，20%的总调谐是由于光学机械的重新配置和其余的热光效应。通过在高于热截止的频率下操作器件，我们展示了仅由光机械效应主导的高速操作。我们的结构的机械和光学共振的独立控制也被证明。
Reconfigurable optical filters are of great importance for applications in optical communication and information processing. Of particular interest are tuning techniques that take advantage of mechanical deformation of the devices, as they offer wider tuning range. Here we demonstrate reconfiguration of coupled photonic crystal nanobeam cavities by using optical gradient force induced mechanical actuation. Propagating waveguide modes that exist over a wide wavelength range are used to actuate the structures and control the resonance of localized cavity modes. Using this all-optical approach, more than 18 linewidths of tuning range is demonstrated. Using an on-chip temperature self-referencing method, we determine that 20% of the total tuning was due to optomechanical reconfiguration and the rest due to thermo-optic effects. By operating the device at frequencies higher than the thermal cutoff, we show high-speed operation dominated by just optomechanical effects. Independent control of mechanical and optical resonances of our structures is also demonstrated.