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<p>Optically pumped magnetometers (OPMs) have emerged as promising quantum sensors for neuroscience, geophysical exploration, and non-destructive testing. Their performance relies on detecting Faraday rotation of a probe beam interacting with spin-polarized alkali atoms. Conventional detection schemes based on polarizing beam splitters and discrete balanced photodetectors remain bulky and limit system miniaturization. Here, we present a chip-scale packaged in-line polarization-resolved detector (CSP-iPRD) that integrates a wire grid polarizer (WGP) and a bi-cell photodiode into a compact form factor. The integrated WGP exhibits a polarization extinction ratio (PER) of 25.3 dB at 795 nm. The assembled CSP detector, with overall dimensions of 3.5 × 3.5 × 1.8 mm<sup>3</sup>, achieves a common-mode rejection ratio (CMMR) of 29.6 dB and an angular resolution of 8.4 × 10<sup>-5</sup> degree/Hz<sup>1/2</sup>. When incorporated into a spin-exchange relaxation-free (SERF) OPM, it achieves a magnetic sensitivity of 33.5 fT/Hz<sup>1/2</sup> at 10 Hz. These results highlight a scalable and CMOS-compatible detection platform that paves the way for next-generation miniaturized OPMs and field-deployable quantum sensing systems.</p><p></p>

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Chip-scale packaged in-line polarization-resolved detector for optically pumped magnetometers

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月31日

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  • Hui Jae Cho,
  • Yeeun Na,
  • Sanghyun Park,
  • Min-Hwan Lee,
  • Hyogi Kim,
  • Jihyeong Ju,
  • Dooyoung Kim,
  • Il-Suk Kang,
  • Jong-Bum You,
  • Gayoung Park,
  • Gapseop Sim,
  • Seung-In Lee,
  • Byung Il Lee,
  • Soo Hyun Kwon,
  • Jong Hyun Song,
  • Euije Jo,
  • Tae Hyun Kim,
  • Giung Rang,
  • Jae-Hyuk Ahn,
  • Hyoungho Ko,
  • Jongwon Lee,
  • Jong-Kwon Lee,
  • Geol Moon,
  • Jongcheol Park

摘要

Optically pumped magnetometers (OPMs) have emerged as promising quantum sensors for neuroscience, geophysical exploration, and non-destructive testing. Their performance relies on detecting Faraday rotation of a probe beam interacting with spin-polarized alkali atoms. Conventional detection schemes based on polarizing beam splitters and discrete balanced photodetectors remain bulky and limit system miniaturization. Here, we present a chip-scale packaged in-line polarization-resolved detector (CSP-iPRD) that integrates a wire grid polarizer (WGP) and a bi-cell photodiode into a compact form factor. The integrated WGP exhibits a polarization extinction ratio (PER) of 25.3 dB at 795 nm. The assembled CSP detector, with overall dimensions of 3.5 × 3.5 × 1.8 mm3, achieves a common-mode rejection ratio (CMMR) of 29.6 dB and an angular resolution of 8.4 × 10-5 degree/Hz1/2. When incorporated into a spin-exchange relaxation-free (SERF) OPM, it achieves a magnetic sensitivity of 33.5 fT/Hz1/2 at 10 Hz. These results highlight a scalable and CMOS-compatible detection platform that paves the way for next-generation miniaturized OPMs and field-deployable quantum sensing systems.