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Cavity Optomechanical Magnetometers

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High Sensitivity Magnetometers

Part of the book series: Smart Sensors, Measurement and Instrumentation ((SSMI,volume 19))

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Abstract

This chapter introduces a new form of magnetometer which combines precision cavity optomechanical measurement with magnetostrictive material response. Such magnetometers can be fabricated on-chip and function both at room temperature and in earths magnetic field. Firstly, we derive the fundamental limit to sensitivity due to the thermomechanical fluctuations of the system, showing that sensitivity exceeding the current state-of-the-art is in-principle possible. We then show that bandwidths in the megahertz range are feasible. Then, we discuss the experimental implementation of these magnetometers, with demonstrated sensitivity at the level of 200 picotesla and tens of micrometer resolution. Finally, we compare both theory and experiments to the state-of-the-art. The sensitivity of current devices is less than a factor of 100 away from the best similarly sized cryogenic SQUID magnetometers, while theory suggests that sensitivity over an order of magnitude superior to those devices is possible.

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Notes

  1. 1.

    The name “Terfenol” derives from terbium, iron (Fe) and the the abbreviation NOL for the Naval Ordinance Laboratory.

  2. 2.

    If we define the measurement strength as the inverse of the on-resonance measurement accuracy B N,min.

  3. 3.

    They can even exceed this limit utilising quantum correlations between photons.

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Author information

Authors and Affiliations

  1. Australian Centre for Engineered Quantum Systems, University of Queensland, Brisbane, QLD, 4072, Australia

    Warwick P. Bowen & Changqiu Yu

  2. National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin, 150080, China

    Changqiu Yu

Authors
  1. Warwick P. Bowen
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  2. Changqiu Yu
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Corresponding author

Correspondence to Warwick P. Bowen .

Editor information

Editors and Affiliations

  1. Ben-Gurion University of the Negev , Beer-Sheva, Israel

    Asaf Grosz

  2. Northern Illinois University, DeKalb, Illinois, USA

    Michael J. Haji-Sheikh

  3. Massey University (Manawatu), Palmerston North, New Zealand

    Subhas C. Mukhopadhyay

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Bowen, W.P., Yu, C. (2017). Cavity Optomechanical Magnetometers. In: Grosz, A., Haji-Sheikh, M., Mukhopadhyay, S. (eds) High Sensitivity Magnetometers. Smart Sensors, Measurement and Instrumentation, vol 19. Springer, Cham. https://doi.org/10.1007/978-3-319-34070-8_11

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  • DOI: https://doi.org/10.1007/978-3-319-34070-8_11

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-34068-5

  • Online ISBN: 978-3-319-34070-8

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