DOE OSTI · 2549459
Photon-magnon coupling using gain-assisted spoof-localized surface plasmons
Abstract
Improving the photon-magnon coupling strength can be done by tuning the structure of microwave resonators to better interact with the magnon counterpart. Planar resonators accommodating unconventional photon modes beyond the half- and quarter-wavelength designs have been explored due to their optimized mode profiles and potentials for on-chip integration. Here, we designed and fabricated an actively controlled ring resonator supporting the spoof localized surface plasmons (LSPs), and implemented it in the investigation of photon-magnon coupling for hybrid magnonic applications. We demonstrated gain-assisted photon-magnon coupling with the YIG magnon mode under several different sample geometries. The achieved coupling amplification largely benefits from the high quality factor (Q-factor) due to the additional gain provided by a semiconductor amplifier, which effectively increases the Q-factor from a nearly null state (passive resonance) to more than 1000 for a quadrupole LSP mode. Our results suggest an additional control knob for manipulating photon-magnon coupled systems exploiting external controls of gain and loss.
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Xiong, Yuzan [University of North Carolina, Chapel Hill, NC (United States)], Christy, Andrew [University of North Carolina, Chapel Hill, NC (United States)], Li, Yi [Argonne National Laboratory (ANL), Argonne, IL (United States)], Sun, Rui [North Carolina State University, Raleigh, NC (United States)], Comstock, Andrew H. [North Carolina State University, Raleigh, NC (United States)], Wu, Junming [University of North Carolina, Chapel Hill, NC (United States)], Lopez, Rene [University of North Carolina, Chapel Hill, NC (United States)], Lei, Sidong [University of Central Florida, Orlando, FL (United States)], Sun, Dali [University of North Carolina, Chapel Hill, NC (United States)], Cahoon, James F. [University of North Carolina, Chapel Hill, NC (United States)], Zhang, Xufeng [Northeastern University, Boston, MA (United States)], Yang, Binbin [North Carolina A&T State University, Greensboro, NC (United States)], Zhang, Wei [University of North Carolina, Chapel Hill, NC (United States)]. 2025-04-07. Photon-magnon coupling using gain-assisted spoof-localized surface plasmons. https://doi.org/10.1364/oe.557146
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