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Dual-band optical filter based on a single microdisk resonator.

Qingzhong Huang1, Xinliang Zhang, Jinsong Xia

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

Optics Letters
|December 6, 2011
PubMed
Summary

We developed a novel dual-band optical filter using a single microdisk resonator. This device achieves high isolation and low loss, confirmed by simulations and experiments on a silicon-on-insulator platform.

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Area of Science:

  • Photonics
  • Nanophotonics
  • Optical Engineering

Background:

  • Microdisk resonators are key components in integrated photonics.
  • Achieving dual-band filtering with high performance remains a challenge.

Purpose of the Study:

  • To propose and demonstrate a dual-band optical filter using a single microdisk resonator.
  • To analyze and simulate the device performance using analytical and numerical methods.

Main Methods:

  • Analytical modeling using the transfer matrix method.
  • Numerical simulation using the finite-difference time-domain (FDTD) method.
  • Fabrication of a double side-coupled microdisk resonator on a silicon-on-insulator platform.

Main Results:

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  • Dual-band bandpass filtering was achieved with optical isolation exceeding 20 dB.
  • Insertion loss was measured to be below 2 dB.
  • Experimental results closely matched the simulation and modeling predictions.

Conclusions:

  • A single microdisk resonator can effectively implement dual-band optical filtering.
  • Optimizing waveguide parameters enables triggering of specific resonant modes for desired filtering characteristics.
  • The demonstrated device offers a promising solution for integrated photonic applications requiring dual-band spectral control.