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14 March 2018 Measurement of photon torques with torsional nano-optomechanical systems (Conference Presentation)
Li He, Huan Li, Mo Li
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Proceedings Volume 10535, Integrated Optics: Devices, Materials, and Technologies XXII; 1053519 (2018) https://doi.org/10.1117/12.2294530
Event: SPIE OPTO, 2018, San Francisco, California, United States
Abstract
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.
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Li He, Huan Li, and Mo Li "Measurement of photon torques with torsional nano-optomechanical systems (Conference Presentation)", Proc. SPIE 10535, Integrated Optics: Devices, Materials, and Technologies XXII, 1053519 (14 March 2018); https://doi.org/10.1117/12.2294530
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KEYWORDS
Integrated optics
Photon polarization
Integrated photonics
Optical tweezers
Optomechanical design
Laser optics
Light wave propagation
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