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1. 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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2. Terahertz Cavity Magnon Polaritons

   https://doi.org/10.1002/adom.202302270  

   Kritzell, T_Elijah; Baydin, Andrey; Tay, Fuyang; Rodriguez, Rodolfo; Doumani, Jacques; Nojiri, Hiroyuki; Everitt, Henry_O; Barsukov, Igor; Kono, Junichiro (December 2023, Advanced Optical Materials)

   Abstract Hybrid light–matter coupled states, or polaritons, in magnetic materials have attracted significant attention due to their potential for enabling novel applications in spintronics and quantum information processing. However, most magnon‐polariton studies in the strong coupling regime to date have been carried out for ferromagnetic materials with magnon excitations at gigahertz frequencies. Here, strong resonant photon–magnon coupling at frequencies above 1 terahertz is investigated for the first time in a prototypical room‐temperature antiferromagnetic insulator, NiO,  inside a Fabry–Pérot cavity. The cavity is formed by the crystal itself with a thickness adjusted to an optimal value. Terahertz time‐domain spectroscopy measurements in magnetic fields up to 25 T reveal the evolution of the magnon frequency through Fabry–Pérot cavity modes with photon–magnon anticrossing behavior, demonstrating clear vacuum Rabi splittings exceeding the polariton linewidths. These results show that NiO is a promising platform for exploring antiferromagnetic spintronics and cavity magnonics in the terahertz frequency range. 

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3. 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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4. Vertical-cavity surface-emitting phase shifter

   https://doi.org/10.1364/OE.497606  

   Almutairi, Dhaifallah; Johnson, Karl; Smolyaninov, Alexei; Grieco, Andrew; Fainman, Yeshaiahu (September 2023, Optics Express)

   This study proposes a novel technique for a 2D beam steering system using hybrid plasmonic phase shifters with a cylindrical configuration in a 2D periodic array suitable for LIDAR applications. A nanoscale VCSEP design facilitates a sub-wavelength spacing between individual phase shifters, yielding an expanded field of view and side lobes suppression. The proposed design includes a highly doped sub-micron silicon pillar covered by a thin layer of nonlinear material and an additional conductive metal layer. Characterization of a single VCSEP demonstrated a Free Spectral Range (FSR) of 53.28 ± 2.5 nm and a transmission variation of 3 dB, with V_πL equal to 0.075 V-mm. 

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5. Widely tunable cavity-enhanced frequency combs

   https://doi.org/10.1364/OL.389412  

   Silfies, Myles_C; Kowzan, Grzegorz; Chen, Yuning; Lewis, Neomi; Hou, Ryan; Baehre, Robin; Gross, Tobias; Allison, Thomas_K (April 2020, Optics Letters)

   We describe the cavity enhancement of frequency combs over a wide tuning range of 450–700 nm ( $><\#comment/>7900{\mathrm{c}\mathrm{m}}^{-<\#comment/>1}$), covering nearly the entire visible spectrum. Tunable visible frequency combs from a synchronously pumped optical parametric oscillator are coupled into a four-mirror, dispersion-managed cavity with a finesse of 600–1400. An intracavity absorption path length enhancement greater than 190 is obtained over the entire tuning range, while preserving intracavity spectral bandwidths capable of supporting sub-200 fs pulse durations. These tunable cavity-enhanced frequency combs can find many applications in nonlinear optics and spectroscopy. 

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