Direct writing of optical waveguides on PADC substrate by e-beam

Claire Darraud-Taupiac; T. Daoud; I. Niort; J.-Louis Decossas; J.-C. Vareille

doi:10.1117/12.406296

15 December 2000 Direct writing of optical waveguides on PADC substrate by e-beam

Claire Darraud-Taupiac, T. Daoud, I. Niort, J.-Louis Decossas, J.-C. Vareille

Proceedings Volume 4087, Applications of Photonic Technology 4; (2000) https://doi.org/10.1117/12.406296
Event: 2000 International Conference on Application of Photonic Technology (ICAPT 2000), 2000, Quebec City, Canada

Abstract

Polymers such as PMMA, PADC (commercially named CR39), BCB .. . under irradiation (gamma rays, ion beam. ..) have been widely studied. It has been shown that they undergo physical and particularly optical change. In the case of ion beam, an optical waveguiding is generated, due to a sufficient localized refractive index increase. In this work, an electron beam (EB) delivered by a Scanning Electron Microscope (SEM) is used. We show that this kind of irradiation also allows to create a guiding layer on the PADC polymer. Taking into account that the minimum spot size is 5 nm and that a specific Computer Aided Design (CAD) application, developed in the group, drives the SEM, we can expect to realize optical microstructures directly on the substrate, with an excellent lateral resolution. The first step of this study is the demonstration of the feasibility of optical waveguides in PADC by the EB techniques, with the aim to apply this method to the field ofinterconnect and optoelectronic devices for Telecommunications. The influence of the main irradiation parameters (energy of the electrons and electronic fluence) on optical characteristics is investigated. The CAD application driving the SEM allows to write various stmctures such as gratings, microguides, discs as well as any combinations ofthese elementary structures in order to achieve microoptical devices. We focused on a microguide structure which behavior is simulated with the intention of optimizing its dimensions and the required refractive index variation. Some modeling results giving the energy repartition in the structure are presented.

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Claire Darraud-Taupiac, T. Daoud, I. Niort, J.-Louis Decossas, and J.-C. Vareille "Direct writing of optical waveguides on PADC substrate by e-beam", Proc. SPIE 4087, Applications of Photonic Technology 4, (15 December 2000); https://doi.org/10.1117/12.406296

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KEYWORDS

Refractive index

Scanning electron microscopy

Waveguides

Computer aided design

Polymers

Ion beams

Electromagnetism

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