Creating traveling waves from standing waves from the gyrotropic paramagnetic properties of Fe${}^{3+}$ ions in a high-Q whispering gallery mode sapphire resonator

Abstract

We report observations of the gyrotropic change in magnetic susceptibility of the Fe${}^{3+}$ electron paramagnetic resonance at 12.037GHz (between spin states $|1/2>$ and $|3/2>$) in sapphire with respect to applied magnetic field. Measurements were made by observing the response of the high-Q Whispering Gallery doublet (WGH${}_{\pm 17,0,0}$) in a Hemex sapphire resonator cooled to 5 K. The doublets initially existed as standing waves at zero field and were transformed to traveling waves due to the gyrotropic response.

Accepted for publication in Phys. Rev. B

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• Spin-Photon Interaction in a Cavity with Time-Reversal Symmetry Breaking
• Four Wave Mixing from Fe3+ Spins in Sapphire
• Hybrid Electron Spin Resonance and Whispering Gallery Mode Resonance Spectroscopy of Fe3+ in Sapphire
• Frequency Conversion in a High Q-factor Sapphire Whispering Gallery Mode Resonator due to Paramagnetic Nonlinearity
• Controlling a whispering gallery doublet mode avoided frequency crossing: Strong coupling between photon bosonic and spin degrees of freedom
• High Resolution Flicker-Noise-Free Frequency Measurements of Weak Microwave Signals
• Generation of Bimodal Solitons in a Sapphire Whispering Gallery Mode Maser at Millikelvin Temperatures
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