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Potential Due to a Polarized Object01:29

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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On-Chip Polarization Rotators Using Metasurface.

Dura Shahwar1,2, Markku Kapulainen1, Tomi Haatainen1

  • 1VTT Technical Research Centre of Finland Ltd, Tietotie 3, 02150 Espoo, Finland.

ACS Omega
|August 5, 2024
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Summary
This summary is machine-generated.

We developed novel gold metasurfaces for efficient light polarization control across wide angles. This breakthrough enables compact, broadband, low-loss on-chip polarization rotators for integrated photonics.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Metasurfaces offer advanced control over light polarization.
  • Conventional metasurfaces often lack broadband operation and wide acceptance angles.
  • Integration with silicon photonics is crucial for miniaturized optical devices.

Purpose of the Study:

  • To design and demonstrate innovative gold-based metasurfaces for broadband polarization manipulation.
  • To achieve high polarization conversion efficiency over a wide range of incident angles.
  • To realize a compact, low-loss on-chip polarization rotator integrated with silicon waveguides.

Main Methods:

  • Fabrication of gold metasurfaces on a silicon-on-insulator platform with up-reflecting mirrors.
  • Characterization of metasurface polarization conversion efficiency and extinction ratio in free space and on-chip.
  • Broadband spectral measurements to evaluate device performance over a wide wavelength range.

Main Results:

  • Metasurface devices achieved polarization conversion efficiencies up to 98.5% at 1550 nm.
  • Metasurface waveplates exhibited extinction ratios >15 dB over a 120 nm bandwidth.
  • On-chip polarization rotator demonstrated an extinction ratio >10 dB for a 100 nm bandwidth.

Conclusions:

  • This study presents the first successful on-chip polarization manipulation using metasurface integration.
  • The developed metasurfaces enable compact, broadband, and low-loss polarization rotators.
  • This technology holds significant potential for advancing photonic integrated circuits.