Abstract
The traditional electrical field sensing can be realized by utilizing electro-optic materials or liquid crystals, and has limitations of easy breakdown, free assembly and difficult measurement of low-frequency. Here, we propose a new method to realize safe measurement of spatial dynamic electric field by using a micro fiber interferometer integrated with gold nanofilm. The energy of the electric charge received through antenna forms the intrinsic electric field with two micro electrodes, one of which is the 120 nm gold film vibration beam micromachined by femtosecond lasers and integrated with the micro fiber. The change of the intrinsic electric field force due to the spatial electric field will cause the vibration of the film beam. By demodulating the output signal of the micro fiber interferometer, the electric field can be measured. We demonstrate the detectable frequency ranges from tens of Hz to tens of KHz, and the minimum electric field intensity is ~200 V/m at 1 KHz. Our electric field measurement technology combining optical fiber interference with gold nanostructures shows the advantages of security, high sensitivity, compact size, and multiplexed multi-point and remote detection.
Highlights
The measurement of electric field in low frequency, and the reported detectable ranges of electric field intensity are above dozens of KV/m for ref. and 1 to 4.1 kV/mm for ref
The gold nanofilm can function as the electrode of the micro area, it deforms under the ultra-weak electrostatic force caused by the strong electric field
The sensor is composed of two parts: The first part is the built-in plate capacitor constructed by the 120 nm gold nanofilm vibration beam and the end surface of the metal probe
Summary
The measurement of electric field in low frequency, and the reported detectable ranges of electric field intensity are above dozens of KV/m for ref. 20 and 1 to 4.1 kV/mm for ref. 21. The measurement of electric field in low frequency, and the reported detectable ranges of electric field intensity are above dozens of KV/m for ref. The sensitivity can be further improved by modifying the structure and the parameters of the antenna (the limit of minimum detectable electrical field intensity can be as low as ~0.015 V/m with the length of the antenna of ~27 mm). The sensing is achieved through the micro area in the sensor with strong electric field formed by the coupling between the antenna and the space electric field. The gold nanofilm can function as the electrode of the micro area, it deforms under the ultra-weak electrostatic force caused by the strong electric field. The change of the space electric field can be detected through demodulating the change of cavity length of the interferometer under the electrostatic force
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
