High sensitive space electric field sensing based on micro fiber interferometer with field force driven gold nanofilm

Area of Science:

• Optoelectronics
• Nanotechnology
• Sensor Technology

Background:

• Traditional electric field sensing methods using electro-optic materials or liquid crystals face limitations such as breakdown, assembly complexity, and poor low-frequency measurement.
• Existing techniques struggle with safe, precise, and versatile spatial dynamic electric field detection.

Purpose of the Study:

• To develop a new, safe, and highly sensitive method for measuring spatial dynamic electric fields.
• To overcome the limitations of conventional electric field sensing technologies.

Main Methods:

• Integration of a micro fiber interferometer with a gold nanofilm vibration beam.
• Fabrication of the gold nanofilm beam using femtosecond lasers.
• Measurement of electric field by demodulating the output signal of the micro fiber interferometer, which detects gold film beam vibrations.

Main Results:

• Demonstrated detectable frequency ranges from tens of Hz to tens of KHz.
• Achieved a minimum detectable electric field intensity of approximately 200 V/m at 1 KHz.
• Validated the system's capability for safe, high-sensitivity, compact, and remote electric field detection.

Conclusions:

• The proposed optical fiber interference and gold nanostructure technology provides a secure and efficient approach for spatial dynamic electric field measurement.
• This method enables multiplexed, multi-point, and remote detection, offering significant advantages over traditional sensing techniques.