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A model for calculating the effect of nanosized pores on refractive index, thermal shift and mechanical stress in optical coatings

Olaf Stenzel

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A simple model is presented that relates optical and mechanical properties of optical coating materials deposited by typical physical vapour deposition techniques to the porosity of the layers. In terms of this model, a clear correlation between thermal shift, mechanical stress and refractive index could be simulated. As a practical conclusion, it is found that a certain fraction of small nanosized pores in the films is essential in order to get a valuable balance between optical and mechanical coating properties.


PACS

78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

62.25.-g Mechanical properties of nanoscale systems

61.43.Gt Powders, porous materials

78.67.-n Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures

68.60.Bs Mechanical and acoustical properties

42.79.Wc Optical coatings

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Optics, quantum optics and lasers

Condensed matter: structural, mechanical & thermal

Nanoscale science and low-D systems

Dates

Issue 5 (7 March 2009)

Received 1 December 2008, in final form 2 December 2008

Published 20 February 2009



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