Efficient broadband simulations for thin optical structures

Xuesong Meng

doi:10.1007/s11082-012-9626-4

Efficient broadband simulations for thin optical structures

2012-10-20

5

PRE

AI

Harshana G. Dantanarayana

T

T.M. Benson

DOI：10.1007/s11082-012-9626-4

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The thickness of the layers comprising optical structures is usually very thin. When modelling such thin features using a traditional numerical method, for instance the transmission-line modelling (TLM) method, a very small space step is often used to properly discretize the material geometry. This consequently results in large memory storage and longer run time. In this paper a new technique embedding thin structures between TLM nodes is investigated. The key features of this technique are the acquisition of the formulations in the frequency domain and the utilisation of digital filter theory and an inverse Z transform to change the formulations to the time domain. This technique has been successfully applied to calculate the reflection and transmission coefficients of optical structures incorporating thin layers, including antireflection coatings and fibre Bragg grating structures.

Keyword:

Antireflection coatings

Digital filter theory

Fibre Bragg grating

Transmission line modelling method

Efficient broadband simulations for thin optical structures

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