Sensitive optomechanical transduction of electric and magnetic signals to the optical domain

Anders Simonsen*, Sampo Antero Saarinen, Juan Diego Sanchez, Jan Henrik Ardenkjær-Larsen, Albert Schliesser, Eugene Simon Polzik

*Corresponding author for this work

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We report a radio-frequency-to-optical converter based on an electro-optomechanical transduction scheme where the electrical, optical, and mechanical interface was integrated on a chip and operated with a fiber-coupled optical setup. The device was designed for field tests in a magnetic resonance scanner where its small form-factor and simple operation is paramount. For the appurtenant magnetic resonance detection circuit at 32 MHz, we demonstrate transduction with an intrinsic magnetic field sensitivity of 8 fT/√Hz, noise figure 2.3 dB, noise temperature 210 K, voltage noise 99 pV/√Hz, and current noise e 113 pA/√Hz, all in a 3 dB-bandwidth of 12 kHz. Such sensitivity and bandwidth make the transducer a valuable alternative to conventional electronic preamplifiers that additionally is directly compatible with fiber communication networks.
Original languageEnglish
JournalOptics Express
Issue number13
Pages (from-to)18561-18578
Publication statusPublished - 2019

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