Photonics Research, Volume. 9, Issue 6, 937(2021)
Phonon lasing in a hetero optomechanical crystal cavity
Fig. 1. (a) Top-view schematic of the hetero optomechanical crystal (OMC) cavity. Inset shows an oblique view of the unit cell that forms the periodic structure. The unit cell can be determined by four geometric parameters, namely, the height (
Fig. 2. Top-view scanning electron microscopy (SEM) images of the (a) hetero OMC cavity, (b) OMC cavity without a hetero structure, and (c) OMC cavity with radiation shield. (d) Optical and (e) mechanical spectra of the three types of OMC cavities.
Fig. 3. (a) SEM image of the measured hetero OMC cavity. (b) Normalized phonon number and linewidth of the hetero OMC cavity as a function of coupled optical power. (c) Normalized mechanical spectra of the hetero OMC cavity before and after phonon lasing. (d) Normalized optical transmission for low- and high-pump power levels with pump power of 0.16 μW and 58.1 μW as a function of the pump wavelength and the detuning wavelength. The two crosses joined by the purple dashed line indicate the same detuning. Herein, the ratio between the optical detuning and optical decay rate was 0.50 when the linewidth of the mechanical spectrum achieved a minimum. (e) Measured mechanical frequency with pump power of 58.1 μW as a function of the pump wavelength. Inset shows the shift in mechanical peak under lasing at different pump wavelengths.
Fig. 4. Allan deviation of the fundamental mechanical mode after phonon lasing.
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Kaiyu Cui, Zhilei Huang, Ning Wu, Qiancheng Xu, Fei Pan, Jian Xiong, Xue Feng, Fang Liu, Wei Zhang, Yidong Huang, "Phonon lasing in a hetero optomechanical crystal cavity," Photonics Res. 9, 937 (2021)
Category: Nanophotonics and Photonic Crystals
Received: Jul. 30, 2020
Accepted: Mar. 1, 2021
Published Online: May. 19, 2021
The Author Email: Kaiyu Cui (kaiyucui@tsinghua.edu.cn)