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Standing Waves in a Cavity

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Related Experiment Video

Updated: Jun 14, 2026

Implementation of a Reference Interferometer for Nanodetection

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Nanometric dual-comb ranging using photon-level microcavity solitons.

Zihao Wang¹, Yifei Wang¹, Baoqi Shi^2,3

¹State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing, China.

Nature Communications

|July 27, 2025

Summary

This summary is machine-generated.

This study introduces dual-comb ranging (DCR) using microresonator soliton pairs for precise distance measurements. The new method achieves nanometer precision even with low return power, enabling advanced applications.

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Area of Science:

Photonics and Metrology
Integrated Optics
Precision Measurement

Background:

Absolute distance measurement is crucial for nanotechnology and satellite formation.
Miniaturized systems face challenges in achieving high precision, speed, and low return power simultaneously.
Existing laser-based methods struggle to meet all requirements for compact devices.

Purpose of the Study:

To demonstrate a miniaturized dual-comb ranging (DCR) system with high precision and low return power.
To leverage microcomb technology for enhanced ranging capabilities.
To establish an optimization principle for DCR systems.

Main Methods:

Generation of a coherent soliton pair in an integrated microresonator.
Utilizing dual-comb ranging (DCR) with a microcomb's large line spacing.
Deriving equations to link DCR precision with comb line powers.

Main Results:

Achieved 1-nm precision in distance measurement.
Measured nanometer-scale vibrations at frequencies up to 0.9 MHz.
Demonstrated precise DCR with extremely low received photon numbers (5.5 × 10^-4 per pulse).
Showcased robustness against intensity noise and loss.

Conclusions:

Microcomb-based DCR offers a solution for high-performance, miniaturized absolute distance measurement.
The developed system integrates high precision ranging with foundry-manufactured photonic chips.
This work provides a quantitative understanding of DCR precision and an optimization principle for dual-comb systems.