An analysis of the surface-normal coupling efficiency of a metal grating coupler embedded in a Scotch tape optical waveguide

Angulo Barrios, Carlos and Canalejas Tejero, Victor (2016). An analysis of the surface-normal coupling efficiency of a metal grating coupler embedded in a Scotch tape optical waveguide. "Optics Communications", v. 382 ; pp. 477-484. ISSN 0030-4018. https://doi.org/10.1016/j.optcom.2016.08.037.

Description

Title: An analysis of the surface-normal coupling efficiency of a metal grating coupler embedded in a Scotch tape optical waveguide
Author/s:
  • Angulo Barrios, Carlos
  • Canalejas Tejero, Victor
Item Type: Article
Título de Revista/Publicación: Optics Communications
Date: 2016
ISSN: 0030-4018
Volume: 382
Subjects:
Freetext Keywords: Micro-optical devicesDiffraction gratingsSubwavelength structuresGuided wavesPolymer waveguidesIntegrated optics devices
Faculty: Instituto de Sistemas Optoelectrónicos y Microtecnología (ISOM) (UPM)
Department: Tecnología Fotónica y Bioingeniería
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The coupling efficiency at normal incidence of recently demonstrated aluminum grating couplers integrated in flexible Scotch tape waveguides has been analyzed theoretically and experimentally. Finite difference time domain (FDTD) and rigorously coupled wave analysis (RCWA) methods have been used to optimize the dimensions (duty cycle and metal thickness) of Scotch tape-embedded 1D Al gratings for maximum coupling at 635 nm wavelength. Good dimension and tape refractive index tolerances are predicted. FDTD simulations reveal the incident beam width and impinging position (alignment) values that avoid rediffraction and thus maximize the coupling efficiency. A 1D Al diffraction grating integrated into a Scotch tape optical waveguide has been fabricated and characterized. The fabrication process, based on pattern transfer, has been optimized to allow complete Al grating transfer onto the Scotch tape waveguide. A maximum coupling efficiency of 20% for TM-polarized normal incidence has been measured, which is in good agreement with the theoretical predictions. The measured coupling efficiency is further increased up to 28% for TM polarization under oblique incidence. Temperature dependence measurements have been also achieved and related to the simulations results and fabrication procedure.

More information

Item ID: 46379
DC Identifier: http://oa.upm.es/46379/
OAI Identifier: oai:oa.upm.es:46379
DOI: 10.1016/j.optcom.2016.08.037
Official URL: http://www.sciencedirect.com/science/article/pii/S0030401816307222?via%3Dihub
Deposited by: Memoria Investigacion
Deposited on: 12 Sep 2017 16:13
Last Modified: 01 Feb 2019 23:30
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