Measurement of thin film parameters using substrate excitation of leaky modes

Ding, T. N.; Garmire, E.

doi:10.1016/0030-4018(83)90368-1

Cited by 8 publications

(2 citation statements)

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“…However, we have observed that leaky waveguide modes can be supported and measured if the poled glass layer is sufficiently thick and that these modes can be used to extract quantitative information about the poled glass layer. Here we use the term leaky modes to denote modes that propagate without total internal reflection at the interface between the poled glass and substrate [25][26][27]. Hence the optical field is continuously lost at each reflection at this interface since the modulus of the reflection coefficient is less than unity.…”

Section: B Prism Coupling Measurementsmentioning

confidence: 99%

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Measurement of the refractive index of electrically poled soda-lime glass layers using leaky modes

Oven¹

2016

Appl. Opt.

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Oven, Robert (2016) Measurement of the refractive index of electrically poled soda-lime glass layers using leaky modes. Applied Optics, 55 (32 Electrically poled layers have been formed in soda-lime glass using graphite electrodes in air. The refractive index and thickness of the poled glass layers have been measured by the analysis of leaky optical modes. These modes are supported by the poled layer and can be determined by analysis of the optical reflectivity measured with a prism coupler arrangement. A relatively constant refractive index ~ 1.486 in the poled glass region is measured, which is ~0.03 below the substrate index. The reflectivity data shows that the transition between poled and un-poled glass is very sharp and is consistent with ion transport models. The thickness of the poled glass region is consistent with the removal of Na + and K + ions from the poled region. The index and depth data is confirmed by interferometric measurements. The tensile stress in the poled glass layer is also estimated from optical birefringence measurements and is estimated to be ~0.3 GN/m 2 .

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Section: B Prism Coupling Measurementsmentioning

confidence: 99%

“…where r=1 for TE propagation and r= npoled 2 for TM propagation [26,32]. It is common in the analysis of guided modes to approximate eqn.…”

Section: Simple Reflectivity Analysismentioning

confidence: 99%