Measuring orbital angular momentum of vortex beams in optomechanics |
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Authors: | Zhucheng Zhang Jiancheng Pei Yi-Ping Wang Xiaoguang Wang |
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Institution: | 1. Zhejiang Institute of Modern Physics, Department of Physics, Zhejiang University, Hangzhou 310027, China2. College of Science, Northwest A&F University, Yangling 712100, China3. Graduate School of China Academy of Engineering Physics, Beijing 100193, China |
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Abstract: | Measuring the orbital angular momentum (OAM) of vortex beams, including the magnitude and the sign, has great application prospects due to its theoretically unbounded and orthogonal modes. Here, the sign-distinguishable OAM measurement in optomechanics is proposed, which is achieved by monitoring the shift of the transmission spectrum of the probe field in a double Laguerre–Gaussian (LG) rotational-cavity system. Compared with the traditional single LG rotational cavity, an asymmetric optomechanically induced transparency window can occur in our system. Meanwhile, the position of the resonance valley has a strong correlation with the magnitude and sign of OAM. This originally comes from the fact that the effective detuning of the cavity mode from the driving field can vary with the magnitude and sign of OAM, which causes the spectral shift to be directional for different signs of OAM. Our scheme solves the shortcoming of the inability to distinguish the sign of OAM in optomechanics, and works well for high-order vortex beams with topological charge value±45, which is a significant improvement for measuring OAM based on the cavity optomechanical system. |
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Keywords: | orbital angular momentum optomechanically induced transparency Laguerre–Gaussian rotational-cavity system optomechanics |
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