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Converting the guided-modes of Bloch surface waves with surface pattern.

X I Tang1, Haoqi Luo1, Junxue Chen2

  • 1Institute of Photonics, Department of Optics and Optical Engineering, University of Science and Technology of China Hefei, Anhui, 230026, China.

Journal of the Optical Society of America. B, Optical Physics
|August 13, 2021
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Summary
This summary is machine-generated.

Researchers achieved broadband mode conversion in low-index waveguides using Bloch surface waves. This innovation is key for developing high-performance photonic devices like mode converters and power splitters.

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Area of Science:

  • Photonics
  • Materials Science
  • Waveguide Optics

Background:

  • Bloch surface waves (BSWs) support guided modes like transverse electric (TE00 and TE01) in subwavelength waveguides.
  • These waveguides are fabricated on one-dimensional dielectric photonic crystals, enabling unique optical properties.

Purpose of the Study:

  • To investigate the conversion between guided modes of BSWs in low-refractive-index ridge waveguides.
  • To explore the potential of these structures for integrated photonic devices.

Main Methods:

  • Utilized the finite difference frequency domain (FDFD) method.
  • Employed coupled mode theory (CMT) for theoretical analysis.
  • Applied the finite-difference time-domain (FDTD) method for numerical simulations.

Main Results:

  • Demonstrated broadband wavelength conversion between guided modes.
  • Achieved mode conversion in a low-index ridge waveguide with specific surface patterning.
  • Developed a mode converter with >90% output mode purity (590-680 nm).
  • Developed a power splitter with an 8:2 ratio (530-710 nm).

Conclusions:

  • The study successfully demonstrates efficient and broadband mode conversion in low-index waveguides.
  • The findings pave the way for advanced lab-on-a-chip photonic devices.
  • The demonstrated mode converter and power splitter exhibit high performance over significant wavelength ranges.