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Related Experiment Video

Updated: May 8, 2026

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
12:08

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

Published on: July 18, 2015

Coupled grating reflectors with highly angular tolerant reflectance.

Stefanie Kroker1, Thomas Käsebier, Ernst-Bernhard Kley

  • 1Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-University, Jena, Germany. stefanie.kroker@uni‑jena.de

Optics Letters
|August 31, 2013
PubMed
Summary
This summary is machine-generated.

We developed high-contrast grating reflectors offering consistent high reflectance for transverse-magnetic light across various angles. This innovation is crucial for advanced optical systems requiring stable performance.

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Published on: October 27, 2017

Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • High-contrast gratings (HCGs) are essential optical components.
  • Achieving angularly independent reflectance is a key challenge in optical engineering.

Purpose of the Study:

  • To design and demonstrate stacked HCG reflectors with broadband, angularly independent reflectance for transverse-magnetic (TM) polarized light.
  • To explore the impact of modal field matching in coupled gratings on optical performance.

Main Methods:

  • Fabrication of a two-layer pair of amorphous silicon and silicon dioxide gratings.
  • Design optimization for a 1550 nm wavelength.
  • Characterization of reflectance across a wide range of incidence angles.

Main Results:

  • Demonstrated virtually angular independent reflectance for TM-polarized light.
  • Achieved reflectance exceeding 96% over the entire angular spectrum.
  • Experimentally verified reflectance over 98% up to 60° and over 90% up to 80° incidence angles.

Conclusions:

  • Stacked HCGs with matched modal fields offer a viable solution for angularly independent reflectance.
  • The demonstrated structure significantly advances the performance capabilities of optical reflectors.