Resonant Reflection From Cylindrical Grating-Waveguide Under Holistic Excitation

Resonant Reflection From Cylindrical Grating-Waveguide Under Holistic Excitation

The phenomenon of resonant reflection from a grating-coupled waveguide mode is conceptually, technologically, and experimentally transposed from a planar corrugated waveguide structure under plane wave excitation to a circularly symmetrical waveguide at the inner wall of a tube under cylindrical wav...

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Bibliographic Details
Published in:IEEE photonics journal Vol. 12; no. 2; pp. 1 - 11
Main Authors: Koussi, Erieta Katerina, Bruhier, Hugo, Higuita, M. A. Usuga, Verrier, Isabelle, Veillas, Colette, Kampfe, Thomas, Reynaud, Stephanie, Crespo-Monteiro, Nicolas, Parriaux, Olivier, Jourlin, Yves
Format: Journal Article
Language:English
Published: Piscataway IEEE 01-04-2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Institute of Electrical and Electronics Engineers (IEEE)
Subjects:
Coordinate transformations
Corrugated waveguides
Coupled modes
Coupling
Couplings
Cylindrical resonant grating
Cylindrical waves
Electron tubes
Gratings
Optical waveguides
Optics
Photoresists
Physics
Planar waveguides
Plane waves
Resists
Silicon compounds
Sol-gel processes
Titanium dioxide
Wave excitation
Wave reflection
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Summary:The phenomenon of resonant reflection from a grating-coupled waveguide mode is conceptually, technologically, and experimentally transposed from a planar corrugated waveguide structure under plane wave excitation to a circularly symmetrical waveguide at the inner wall of a tube under cylindrical wave excitation. The mode coupling element is an azimuthally periodic wall corrugation having an integer number of lines parallel to the tube axis. The grating is defined by diffractive coordinate transform of a radial grating phase-mask transverse to the tube axis under axial beam exposure onto a photoresist-coated TiO 2 sol-gel wall-waveguide. The holistic excitation of a waveguide mode is achieved by transforming a broad spectrum, centered axial incident beam into a cylindrical wave by a centered, 90° apex reflective cone. The expected resonantly reflected cylindrical wave at the mode-coupling wavelength is in turn transformed back into an axial beam by the cone. TE resonant reflection is demonstrated experimentally.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2020.2966146