Near-Infrared Active Metasurface for Dynamic Polarization Conversion

Pin Chieh Wu, Ruzan Sokhoyan, Ghazaleh Kafaie Shirmanesh, Wen Hui Cheng, Harry A. Atwater

Research output: Contribution to journalArticlepeer-review

Abstract

Control of optical polarization is central to harnessing the properties of electromagnetic radiation for many applications, including 3D imaging and quantum computation. However, conventional optical polarizing components are typically bulky and static, that is, fixed in their degree of polarization control. Active metasurfaces have potential for versatile polarization control in a compact form factor by temporally modulating electromagnetic amplitudes and phase between orthogonal electric field components. Here, dynamic control of the polarization state of reflected light from an active metasurface is demonstrated. The metasurface uses indium tin oxide (ITO) as an active element in an array of aluminum nanoantennas operating in the telecom range. Applying an electrical bias between the ITO layer and the back reflector modulates the carrier concentration in ITO at the gate-dielectric/ITO interface, resulting in complex refractive index modulation in the epsilon-near-zero condition. This index modulation alters the degree of excitation of plasmonic modes corresponding to the orthogonal polarization components, leading to polarization modulation. By suitably biasing the metasurface, linearly polarized incident light can be converted to cross-polarized, circularly polarized or elliptically polarized light upon reflection. Dynamic control of the reflected polarization state has potentially wide applications in dynamic wave plates, spatial light modulators, and adaptive wavefront control.

Original languageEnglish
Article number2100230
JournalAdvanced Optical Materials
Volume9
Issue number16
DOIs
Publication statusPublished - 2021 Aug 18

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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