Yongjun Huang,1* Guangjun Wen,1 Chee Wei Wong2
1School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China
2Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California at Los Angeles, Los Angeles, CA 90095, USA
Nano-Micro Conference, 2017, 1, 01005
Published Online: 03 October 2017 (Abstract)
Based on the air-slot line-defected photonic crystal nano-cavity , here we develop a monolithic integration of photonic crystal optomechanical oscillators and on-chip high speed Ge detectors (see Figure 1) by using the silicon CMOS platform. With the generations of both high harmonics (up to 59th order) and subharmonics (down to 1/4), due to strong mutual couplings between optomechanical self-sustained oscillation and self-pulsation oscillation, our chipset provides multiple low phase noise frequency tones  for applications in both frequency multipliers and dividers. The synchronization between two mechanical modes  and dynamical chaos  in the optomechanical cavity are reported as well. These characteristics enable optomechanical oscillators as a frequency reference platform for radio-frequency-photonic information processing.
|Figure 1. Fabricated optomechanical cavity integrated with on-chip Ge-detector.|
Moreover, we further demonstrate a chip-scale optomechanical cavity with large mass (see Figure 2) which operates at ~77.7 kHz fundamentally and exhibits large optomechanical coupling of 44+ GHz/nm. The mechanical shifting range of ~58 kHz and more than 100-order harmonics are obtained with which the free-running frequency instability is lower than 10-6 at 0.1 sec integration time . The optomechanical coupling strength can be mechanically controlled by taper fiber and the Drude self-pulsation plasma locking is also reported in this platform . Such large mass optomechanical cavity can be applied for the sensing applications, such as accelerometers and magnetometers.
|Figure 2. Fabricated large mass optomechanical cavity|
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 Xingsheng Luan; Yongjun Huang; Ying Li; James F. McMillan; Jiangjun Zheng; Shu-Wei Huang; Pin-Chun Hsieh; Tingyi Gu; Di Wang; Archita Hati; David A. Howe; Guangjun Wen; Mingbin Yu; Guoqiang Lo; Dim-Lee Kwong; Chee Wei Wong, An integrated low phase noise radiation-pressure-driven optomechanical oscillator chipset. Scientific Reports. 4, 6842 (2014). doi:10.1038/srep06842
 Yongjun Huang; Jiagui Wu; Jaime Gonzalo Flor Flores; Mingbin Yu; Dim-Lee Kwong, Synchronization in air-slot photonic crystal optomechanical oscillators, Applied Physics Letters, 110, 111107 (2017). doi:10.1063/1.4978671
 Jiagui Wu; Shu-Wei Huang; Yongjun Huang; Hao Zhou; Jinghui Yang; Jia-Ming Liu; Mingbin Yu; Guoqiang Lo; Dim-Lee Kwong; Shukai Duan; Chee Wei Wong, Mesoscopic chaos mediated by Drude electron-hole plasma in silicon optomechanical oscillators. Nature Communications. 8, 15570 (2017). doi:10.1038/ncomms15570
 Yongjun Huang; Jaime Gonzalo Flor Flores; Ziqiang Cai; Mingbin Yu; Dim-Lee Kwong; Guangjun Wen; Layne Churchill; Chee Wei Wong, A low-frequency chip-scale optomechanical oscillator with 58 kHz mechanical stiffening and more than 100th-order stable harmonics, Scientific Reports. 7, 4383 (2017). doi:10.1038/s41598-017-04882-4
 Yongjun Huang; Jaime G. Flores; Ziqiang Cai; Mingbin Yu; Dim-Lee Kwong; Guangjun Wen; Chee Wei Wong, Controllable optomechanical coupling and Drude self-pulsation plasma locking in chip-scale optomechanical cavities. Optics Express. 25(6), 6851-6859 (2017). doi:10.1364/OE.25.006851
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