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1. Cavity magnonics

   https://doi.org/10.1016/j.physrep.2022.06.001  

   Zare Rameshti, Babak; Viola Kusminskiy, Silvia; Haigh, James A.; Usami, Koji; Lachance-Quirion, Dany; Nakamura, Yasunobu; Hu, Can-Ming; Tang, Hong X.; Bauer, Gerrit E.W.; Blanter, Yaroslav M. (September 2022, Physics Reports)

   Fulvio Parmigiani (Ed.)

   Cavity magnonics deals with the interaction of magnons — elementary excitations in magnetic materials — and confined electromagnetic fields. We introduce the basic physics and review the experimental and theoretical progress of this young field that is gearing up for integration in future quantum technologies. Much of its appeal is derived from the strong magnon–photon coupling and the easily-reached nonlinear regime in microwave cavities. The interaction of magnons with light as detected by Brillouin light scattering is enhanced in magnetic optical resonators, which can be employed to cool and heat magnons. The microwave cavity photon-mediated coupling of a magnon mode to a superconducting qubit enables measurements in the single magnon limit. 

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2. Cavity continuum

   https://doi.org/10.1364/PRJ.505164  

   Cheng, Fan; Shuvayev, Vladimir; Douvidzon, Mark; Deych, Lev; Carmon, Tal (January 2024, Photonics Research)

   We experimentally demonstrate and numerically analyze large arrays of whispering gallery resonators. Using fluorescent mapping, we measure the spatial distribution of the cavity ensemble’s resonances, revealing that light reaches distant resonators in various ways, including while passing through dark gaps, resonator groups, or resonator lines. Energy spatially decays exponentially in the cavities. Our practically infinite periodic array of resonators, with a quality factor (Q) exceeding 10⁷, might impact a new type of photonic ensembles for nonlinear optics and lasers using our cavity continuum that is distributed, while having high-Qresonators as unit cells. 

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3. Floquet Cavity Electromagnonics

   https://doi.org/10.1103/PhysRevLett.125.237201  

   Xu, Jing; Zhong, Changchun; Han, Xu; Jin, Dafei; Jiang, Liang; Zhang, Xufeng (December 2020, Physical Review Letters)
4. Aligning an optical cavity: with reference to cavity ring-down spectroscopy

   https://doi.org/10.1364/AO.405189  

   Telfah, Hamzeh; Paul, Anam_C; Liu, Jinjun (October 2020, Applied Optics)

   A procedure for timely, accurate, and reproducible alignment of an optical cavity is described. 

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5. Imaging-based cavity optomechanics

   https://doi.org/10.1117/12.2676081  

   Pluchar, Christian M; Agrawal, Aman R; Wilson, Dalziel J (October 2023, SPIE)

   Dholakia, Kishan; Spalding, Gabriel C (Ed.)

   Cavity optomechanics has led to advances in quantum sensing, optical manipulation of mechanical systems, and macroscopic quantum physics. However, previous studies have typically focused on cavity optomechanical coupling to translational degrees of freedom, such as the drum mode of a membrane, which modifies the amplitude and phase of the light field. Here, we discuss recent advances in “imaging-based” cavity optomechanics – where information about the mechanical resonator’s motion is imprinted onto the spatial mode of the optical field. Torsion modes are naturally measured with this coupling and are interesting for applications such as precision torque sensing, tests of gravity, and measurements of angular displacement at and beyond the standard quantum limit. In our experiment, the high-Q torsion mode of a Si3N4 nanoribbon modulates the spatial mode of an optical cavity with degenerate transverse modes. We demonstrate an enhancement of angular sensitivity read out with a split photodetector, and differentiate the “spatial” optomechanical coupling found in our system from traditional dispersive coupling. We discuss the potential for imaging-based quantum optomechanics experiments, including pondermotive squeezing and quantum back-action evasion in an angular displacement measurement. 

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