Photonic crystal cavities based on suspended yttrium iron garnet nanobeams

• URL: http://arxiv.org/abs/2412.05361v2
• Date: Thu, 02 Oct 2025 03:49:47 GMT
• Title: Photonic crystal cavities based on suspended yttrium iron garnet nanobeams
• Authors: Alireza Rashedi, Mehri Ebrahimi, Yunhu Huang, Matt J. Rudd, V. A. S. V. Bittencourt, John P. Davis,
• Abstract summary: We report the fabrication and optical characterization of an air-suspended photonic crystal nanobeam cavity in yttrium-iron-garnet (YIG)<n>YIG's combination of low optical loss and ferriism makes it highly attractive for quantum technologies.
• Score: 0.15393457051344295
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: We report the fabrication and optical characterization of an air-suspended photonic crystal nanobeam cavity in yttrium-iron-garnet (YIG) realized by focused-ion-beam milling. YIG's combination of low optical loss and ferrimagnetism makes it highly attractive for quantum technologies, yet prior work has largely been focused on millimeter-scale spheres and simple microstructures, hindering true on-chip integration. Demonstrating nanometer-scale patterning in a suspended geometry therefore represents an important advance. Finite-element simulations predict that the same structure supports a flapping-type mechanical mode at $\Omega / 2\pi \approx 1.52 \,\text{GHz}$ and a backward-volume spin-wave mode at $\Omega / 2\pi = 11.59 \,\text{GHz}$ under an in-plane bias field. Although we measure only the photonic resonance (intrinsic $Q \sim 2 \times 10^{3}$) in this study, the device lays the groundwork for future exploration of coupled photon-phonon-magnon dynamics once higher optical quality factors are achieved.

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