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Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors

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Published on: January 29, 2013

Integrated microcavity electric field sensors using Pound-Drever-Hall detection.

Xinyu Ma¹, Zhaoyu Cai², Chijie Zhuang³

¹State Key Laboratory of Power Systems, Department of Electrical Engineering, Tsinghua University, Beijing, 100084, China.

Nature Communications

|February 15, 2024

Summary

We developed a highly sensitive microcavity electric field sensor (MEFS) using silicon chip-based thin film lithium niobate. This integrated photonic sensor achieves unprecedented sensitivity and broad bandwidth for electric field detection.

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Area of Science:

Photonics
Integrated Optics
Sensing Technology

Background:

Weak electric field detection is crucial for cosmology, quantum technology, and power systems.
Photonic integration offers enhanced performance for electric field sensors.
Existing sensors have limitations in sensitivity and bandwidth.

Purpose of the Study:

To demonstrate a high-Q microcavity electric field sensor (MEFS) on a silicon chip.
To leverage thin-film lithium niobate for improved electro-optical interactions.
To achieve ultra-high sensitivity and broad bandwidth for electric field measurements.

Main Methods:

Fabrication of a high-Q microcavity on silicon chip-based thin-film lithium niobate.
Utilizing the Pound-Drever-Hall detection scheme for sensitive measurements.
Integration of photonic circuits for enhanced microwave and lightwave interactions.

Main Results:

Achieved a detection sensitivity of 5.2 μV/(m[Formula: see text]), surpassing previous sensors by two orders of magnitude.
Demonstrated a bandwidth up to three orders of magnitude broader than quantum sensing approaches.
Enabled real-time measurement of fast electric field amplitude and phase variations.

Conclusions:

The developed MEFS represents a significant advancement in electric field sensing.
This technology paves the way for electric field sensing networks.
Broadens the application scope of integrated microcavities in sensing.