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arXiv 1603.08950physics.optics
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集成光子器件中光子自旋angular momentum和光矩的光机测量

Optomechanical measurement of photon spin angular momentum and optical torque in integrated photonic devices

Li He, Huan Li, Mo Li

摘要:

光子携带线动量,并且在圆偏振或椭圆偏振时旋转角动量。在光与物质相互作用过程中,线动量的传递导致光动力,而角动量的传递则导致光力矩。包括辐射压力和梯度力在内的光学力长期以来被用于光镊和激光冷却。在纳米光子器件中,光学力可以显著增强,从而在经典和量子机制中产生前所未有的光学机械效应。相反,到目前为止,光的角动量和光矩效应在集成光子学中仍未被探索。在这里,我们演示了在双折射波导中传播的光子的自旋角动量的测量和使用的光转矩致动的光学机械设备的旋转运动。我们表明,的符号和大小的光扭矩是由光子偏振态,在芯片上合成。我们的研究揭示了光子偏振自由度的力学效应,并证明了它在集成光子器件中的控制。利用光矩和与光子角动量的光机械相互作用可以导致扭转腔光力学和光机械光子自旋轨道耦合,以及诸如光机械陀螺仪和扭转磁力测量的应用。

英文摘要:

Photons carry linear momentum, and spin angular momentum when circularly or elliptically polarized. During light-matter interaction, transfer of linear momentum leads to optical forces, while angular momentum transfer induces optical torque. Optical forces including radiation pressure and gradient forces have long been utilized in optical tweezers and laser cooling. In nanophotonic devices optical forces can be significantly enhanced, leading to unprecedented optomechanical effects in both classical and quantum regimes. In contrast, to date, the angular momentum of light and the optical torque effect remain unexplored in integrated photonics. Here, we demonstrate the measurement of the spin angular momentum of photons propagating in a birefringent waveguide and the use of optical torque to actuate rotational motion of an optomechanical device. We show that the sign and magnitude of the optical torque are determined by the photon polarization states that are synthesized on the chip. Our study reveals the mechanical effect of photon's polarization degree of freedom and demonstrates its control in integrated photonic devices. Exploiting optical torque and optomechanical interaction with photon angular momentum can lead to torsional cavity optomechanics and optomechanical photon spin-orbit coupling, as well as applications such as optomechanical gyroscope and torsional magnetometry.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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