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On-chip terahertz isolator with ultrahigh isolation ratios.

Shixing Yuan1, Liao Chen1, Ziwei Wang1

  • 1Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074, Wuhan, China.

Nature Communications
|September 23, 2021
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Summary

We developed an integrated terahertz isolator using a magneto-optical resonator, achieving ultrahigh isolation of 52 dB. This device enables unidirectional terahertz wave propagation and tunable operation for advanced terahertz systems.

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Area of Science:

  • Photonics and Optics
  • Materials Science
  • Electromagnetism

Background:

  • Terahertz (THz) isolators are crucial nonreciprocal devices for manipulating THz wave propagation in complex systems.
  • Breaking Lorentz reciprocity is essential for device functionality, enabling directional control of electromagnetic signals.
  • Existing THz isolators often face challenges in integration, tunability, and performance.

Purpose of the Study:

  • To report an integrated terahertz isolator based on a magneto-optical nonreciprocal resonator.
  • To demonstrate ultrahigh isolation and low insertion loss for efficient THz signal manipulation.
  • To achieve tunable operation across a specific frequency range for versatile applications.

Main Methods:

  • Fabrication of an integrated terahertz isolator utilizing a nonreciprocal resonator.
  • Optimization of the resonator's magneto-optical properties and loss characteristics.
  • Experimental characterization of the device's isolation, insertion loss, and frequency tunability.

Main Results:

  • Experimental observation of unidirectional terahertz wave propagation.
  • Achieved an ultrahigh isolation ratio of up to 52 dB.
  • Measured an insertion loss of approximately 7.5 dB at ~0.47 THz.
  • Demonstrated thermal tuning for operation across the 0.405–0.495 THz range.

Conclusions:

  • The developed on-chip terahertz isolator offers superior nonreciprocal performance.
  • The device's tunable nature and high isolation pave the way for practical THz applications.
  • This work provides a promising platform for future integrated terahertz nonreciprocal devices.