Optical Coating Technology

Generalization of the Rouard method to an absorbing thin-film stack and application to surface plasmon resonance

“…For a multiple-layer stack, Maxwell's equations are conventionally implemented using a matrix formulation such as first provided by Abeles, 1 and further developed by Yeh. [2][3][4] The Snell invariant is born from the continuity of the field components along each interface.…”

Periodically patterned columnar thin films as blazed diffraction gratings

“…(1). The data in Table 2 for the grating with the shorter period, however, reveal a lower level of agreement, although the qualitative trends are maintained.…”

“…Thin films comprising parallel tilted columns are grown routinely by a variety of physical vapor deposition techniques such as thermal evaporation, electron-beam evaporation, and sputtering [1,2]. A collimated vapor flux is generated from a source material and directed towards a planar substrate, the entire process taking place in a low-pressure chamber.…”

Cavity-enhanced absorption using an atomic line source: application to deep-UV measurements

“…The small non-zero intercept arose because air for the baseline was taken from outside the chamber where the humidity was slightly higher (40.6%). Water vapour adsorbed to the mirror coating reduces both the absorption and, to a lesser extent, the reflectivity of the mirror, 16 so that a change in humidity causes a change in cavity transmission. In the O 3 calibration the small difference resulted in the baseline signal (I 0 ) being too high.…”