Effect of fabrication tolerances on the performance of two-dimensional polymer photonic crystal channel drop filters: a theoretical investigation based on the finite element method

Francesco Dell’Olio,Caterina Ciminelli,Mario Nicola Armenise,Donato Conteduca

doi:10.1117/1.oe.52.9.097104

Francesco Dell’Olio, Caterina Ciminelli + Show 2 more

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https://doi.org/10.1117/1.oe.52.9.097104

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Journal: Optical Engineering	Publication Date: Sep 12, 2013
Citations: 4	License type: cc-by

Affiliation: Polytechnic University of Bari

Abstract

Guidelines for the design and fabrication of polymer photonic crystal channel drop filters for coarse wavelength division multiplexing are provided. A Fabry-Perot cavity consisting of a membrane-type slab photonic crystal, where a hole row perpendicular to the propagation direc- tion is removed, is considered. We selected nanoimprinting as the manu- facturing technique. The influence on the cavity performance of several key parameters, i.e., polymer core material, lattice geometry, defect length, and holes' radius, has been investigated in a device compliant with the requirement of the ITU-T G.694.2 standard. A detailed analysis of the fabrication tolerances has been carried out at 1551 nm. The maxi- mum acceptable drift of the geometrical parameters has been accurately evaluated by using the finite element method to prove that the fabrication tolerances do not significantly affect the performance of polymer filters for coarse wavelength division multiplexing, when manufactured by thermal nanoimprinting lithography. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI. (DOI:

Highlights

For more than one decade, photonic-crystal slabs have been identified as one of the most promising photonic crystals (PhCs) configurations due to their high design flexibility and the possibility of fabricating them through the wellestablished planar technology, and several high-performance devices have been demonstrated.[1,2] The wavelength of the defect modes in PhC slabs can be identified by tailoring both size and shape of defects
One of the most promising applications of 2-D PhC cavities is in the field of coarse wavelength division multiplexing (CWDM), which is a well-established technology for short-haul, enterprise, and metro optical networks demanding next-generation chip-scale photonic components having high reliability and low cost.[20]
We study the fabrication tolerances of a channel drop filter for CWDM, which is compliant with the requirement of the ITU-T G.694.2 standard

Summary

Introduction

For more than one decade, photonic-crystal slabs have been identified as one of the most promising photonic crystals (PhCs) configurations due to their high design flexibility and the possibility of fabricating them through the wellestablished planar technology, and several high-performance devices have been demonstrated.[1,2] The wavelength of the defect modes in PhC slabs can be identified by tailoring both size and shape of defects. This allows one to design and fabricate microcavities covering a wide range of applications in the field of low-threshold lasers,[3] channel drop filters,[4,5,6] and chemical sensing.[7,8] Fabry-Perot cavities, made by a couple of two-dimensional (2-D) photonic bandgap mirrors separated by an unperturbed region, have been widely investigated.[9,10,11]

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