التفاصيل البيبلوغرافية
العنوان: |
Metasurface-integrated elliptically polarized laser-pumped SERF magnetometers. |
المؤلفون: |
Liang, Zihua, Hu, Jinsheng, Zhou, Peng, Liu, Lu, Hu, Gen, Wang, Ankang, Ye, Mao |
المصدر: |
Microsystems & Nanoengineering; 7/19/2024, Vol. 10 Issue 1, p1-10, 10p |
مصطلحات موضوعية: |
MAGNETOMETERS, OPTIMIZATION algorithms, SILICON nitride, BIOMAGNETISM, MAGNETOCARDIOGRAPHY, BIO-imaging sensors, MAGNETOENCEPHALOGRAPHY |
مستخلص: |
The emergence of biomagnetism imaging has led to the development of ultrasensitive and compact spin-exchange relaxation-free (SERF) atomic magnetometers that promise high-resolution magnetocardiography (MCG) and magnetoencephalography (MEG). However, conventional optical components are not compatible with nanofabrication processes that enable the integration of atomic magnetometers on chips, especially for elliptically polarized laser-pumped SERF magnetometers with bulky optical systems. In this study, an elliptical-polarization pumping beam (at 795 nm) is achieved through a single-piece metasurface, which results in an SERF magnetometer with a high sensitivity reaching 10.61 fT/Hz1/2 by utilizing a 87Rb vapor cell with a 3 mm inner diameter. To achieve the optimum theoretical polarization, our design combines a computer-assisted optimization algorithm with an emerging metasurface design process. The metasurface is fabricated with 550 nm thick silicon-rich silicon nitride on a 2 × 2 cm2 SiO2 substrate and features a 22.17° ellipticity angle (a deviation from the target polarization of less than 2%) and more than 80% transmittance. This study provides a feasible approach for on-chip polarization control of future all-integrated atomic magnetometers, which will further pave the way for high-resolution biomagnetism imaging and portable atomic sensing applications. [ABSTRACT FROM AUTHOR] |
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قاعدة البيانات: |
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